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Document And Entity Information (USD $) In Billions, except Share data, unless otherwise specified	12 Months Ended
Dec. 31, 2011	Jan. 31, 2012	Jun. 30, 2011
Document And Entity Information [Abstract]
Document Type	10-K
Amendment Flag	false
Document Period End Date	Dec 31, 2011
Document Fiscal Year Focus	2011
Document Fiscal Period Focus	FY
Entity Registrant Name	STATE STREET Corp
Entity Central Index Key	0000093751
Current Fiscal Year End Date	--12-31
Entity Filer Category	Large Accelerated Filer
Entity Common Stock, Shares Outstanding		487,849,175
Entity Well-known Seasoned Issuer	Yes
Entity Current Reporting Status	Yes
Entity Voluntary Filers	No
Entity Public Float			$ 22.4

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Consolidated Statement Of Income (USD $) In Millions, except Share data in Thousands, unless otherwise specified	12 Months Ended
Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Fee revenue:
Servicing fees	$ 4,382		$ 3,938		$ 3,334
Management fees	917		829		766
Trading services	1,220		1,106		1,094
Securities finance	378		318		570
Processing fees and other	297		349		171
Total fee revenue	7,194		6,540		5,935
Net interest revenue:
Interest revenue	2,946		3,462		3,286
Interest expense	613		763		722
Net interest revenue	2,333		2,699		2,564
Gains (Losses) related to investment securities, net:
Net gains (losses) from sales of investment securities	140		(55)		368
Losses from other-than-temporary impairment	(123)		(651)		(1,155)
Losses not related to credit	50	[1]	420	[1]	928	[1]
Gains (Losses) related to investment securities, net	67		(286)		141
Total revenue	9,594		8,953		8,640
Provision for loan losses			25		149
Expenses:
Compensation and employee benefits	3,820		3,524		3,037
Information systems and communications	776		713		656
Transaction processing services	732		653		583
Occupancy	455		463		475
Securities lending charge			414
Provision for fixed-income litigation exposure			9		250
Acquisition and restructuring costs	269		245		49
Professional services	347		277		264
Amortization of other intangible assets	200		179		136
Other	459		374		516
Total expenses	7,058		6,842		5,966
Income before income tax expense and extraordinary loss	2,536		2,086		2,525
Income tax expense	616		530		722
Income before extraordinary loss	1,920		1,556		1,803
Extraordinary loss, net of taxes					(3,684)
Net income (loss)	1,920		1,556		(1,881)
Net income before extraordinary loss available to common shareholders	1,882		1,540		1,640
Net income (loss) available to common shareholders	$ 1,882		$ 1,540		$ (2,044)
Earnings per common share before extraordinary loss:
Basic	$ 3.82		$ 3.11		$ 3.5
Diluted	$ 3.79	[2]	$ 3.09	[2]	$ 3.46	[2]
Earnings (Loss) per common share:
Basic	$ 3.82		$ 3.11		$ (4.32)
Diluted	$ 3.79		$ 3.09		$ (4.31)
Average common shares outstanding (in thousands):
Basic	492,598		495,394		470,602
Diluted	496,072		497,924		474,003
[1]	Pursuant to revised GAAP adopted on April 1, 2009, these losses were recorded, net of related taxes, a component of other comprehensive income; refer to note 12.
[2]	Calculations for 2011 and 2010 reflected the allocation of earnings to participating securities using the two-class method, as this computation was more dilutive than the calculation using the treasury stock method.

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Consolidated Statement Of Condition (USD $) In Millions, unless otherwise specified	Dec. 31, 2011	Dec. 31, 2010
Assets
Cash and due from banks	$ 2,193	$ 3,311
Interest-bearing deposits with banks	58,886	22,234
Securities purchased under resale agreements	7,045	2,928
Trading account assets	707	479
Investment securities available for sale	99,832	81,881
Investment securities held to maturity (fair value of $9,362 and $12,576)	9,321	12,249
Loans and leases (less allowance for losses of $22 and $100)	10,031	11,857
Premises and equipment (net of accumulated depreciation of $3,673 and $3,425)	1,747	1,802
Accrued income receivable	1,822	1,733
Goodwill	5,645	5,597
Other intangible assets	2,459	2,593
Other assets	17,139	13,841
Total assets	216,827	160,505
Deposits:
Noninterest-bearing	59,229	17,464
Interest-bearing - U.S.	7,148	6,957
Interest-bearing - Non-U.S.	90,910	73,924
Total deposits	157,287	98,345
Securities sold under repurchase agreements	8,572	7,599
Federal funds purchased	656	7,748
Other short-term borrowings	4,766	7,202
Accrued expenses and other liabilities	18,017	13,274
Long-term debt	8,131	8,550
Total liabilities	197,429	142,718
Commitments and contingencies (note 10)
Shareholders' equity
Preferred stock, no par: 3,500,000 shares authorized; 5,001 shares issued and outstanding	500
Common stock, $1 par: 750,000,000 shares authorized; 503,965,849 and 502,064,454 shares issued	504	502
Surplus	9,557	9,356
Retained earnings	10,176	8,634
Accumulated other comprehensive loss	(659)	(689)
Treasury stock, at cost (16,541,985 and 420,016 shares)	(680)	(16)
Total shareholders' equity	19,398	17,787
Total liabilities and shareholders' equity	$ 216,827	$ 160,505

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Consolidated Statement Of Condition (Parenthetical) (USD $) In Millions, except Share data, unless otherwise specified	Dec. 31, 2011	Dec. 31, 2010
Consolidated Statement Of Condition [Abstract]
Investment securities held to maturity, Fair Value	$ 9,362	$ 12,576
Loans and leases, allowance for losses	22	100
Premises and equipment, accumulated depreciation	$ 3,673	$ 3,425
Preferred stock, no par value
Preferred stock, shares authorized	3,500,000	3,500,000
Preferred stock, shares issued	5,001	5,001
Preferred stock, shares outstanding	5,001	5,001
Common stock, par	$ 1	$ 1
Common stock, shares authorized	750,000,000	750,000,000
Common stock, shares issued	503,965,849	502,064,454
Treasury stock, shares	16,541,985	420,016

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Consolidated Statement Of Changes In Shareholders' Equity (USD $) In Millions, except Share data in Thousands, unless otherwise specified	Preferred Stock [Member]	Common Stock [Member]	Surplus [Member]	Retained Earnings [Member]	Accumulated Other Comprehensive (Loss) Income [Member]	Treasury Stock [Member]	Total
Balance at Dec. 31, 2008	$ 1,883	$ 432	$ 6,992	$ 9,135	$ (5,650)	$ (18)	$ 12,774
Balance, Shares at Dec. 31, 2008		431,976				418
Comprehensive income:
Net income (loss)				(1,881)			(1,881)
Change in net unrealized loss on available-for-sale securities, net of reclassification adjustment and net of related taxes					3,410		3,410
Change in net unrealized loss on available-for-sale securities designated in fair value hedges, net of related taxes					129		129
Expected losses from other-than-temporary impairment on held-to-maturity securities related to factors other than credit, net of related taxes					(387)		(387)
Foreign currency translation, net of related taxes					213		213
Change in net unrealized loss on cash flow hedges, net of related taxes					10		10
Change in minimum pension liability, net of related taxes					37		37
Total comprehensive income				(1,881)	3,412		1,531
Stock issued		59	2,172				2,231
Cash dividends declared:
Common stock				(20)			(20)
Preferred stock				(46)			(46)
Accretion of preferred stock discount	11			(11)			117
Prepayment of preferred stock discount	106			(106)
Stock issued, Shares		58,974
Redemption of TARP preferred stock	(2,000)						(2,000)
Repurchase of TARP common stock warrant			(60)				(60)
Common stock awards and options exercised, including related taxes, Shares		4,416
Common stock awards and options exercised, including related taxes		4	76				80
Other, Shares						14
Other						1	1
Balance at Dec. 31, 2009		495	9,180	7,071	(2,238)	(17)	14,491
Adjustment for effect of application of provisions of new accounting standard at Dec. 31, 2009				27	(27)
Balance, Shares at Dec. 31, 2009		495,366				432
Balance at Dec. 31, 2009		495	9,180	7,098	(2,265)	(17)	14,491
Balance, Shares at Dec. 31, 2009						432
Comprehensive income:
Net income (loss)				1,556			1,556
Change in net unrealized loss on available-for-sale securities, net of reclassification adjustment and net of related taxes					1,398		1,398
Change in net unrealized loss on available-for-sale securities designated in fair value hedges, net of related taxes					(22)		(22)
Expected losses from other-than-temporary impairment on held-to-maturity securities related to factors other than credit, net of related taxes					276		276
Foreign currency translation, net of related taxes					(65)		(65)
Change in net unrealized loss on cash flow hedges, net of related taxes					7		7
Change in minimum pension liability, net of related taxes					(18)		(18)
Total comprehensive income				1,556	1,576		3,132
Cash dividends declared:
Common stock				(20)			(20)
Common stock awards and options exercised, including related taxes, Shares		6,698					297
Common stock awards and options exercised, including related taxes		7	176				183
Other, Shares						(12)
Other						1	1
Balance at Dec. 31, 2010		502	9,356	8,634	(689)	(16)	17,787
Balance, Shares at Dec. 31, 2010		502,064				420
Comprehensive income:
Net income (loss)				1,920			1,920
Change in net unrealized loss on available-for-sale securities, net of reclassification adjustment and net of related taxes					328		328
Change in net unrealized loss on available-for-sale securities designated in fair value hedges, net of related taxes					(75)		(75)
Expected losses from other-than-temporary impairment on held-to-maturity securities related to factors other than credit, net of related taxes					25		25
Foreign currency translation, net of related taxes					(216)		(216)
Change in net unrealized loss on cash flow hedges, net of related taxes					6		6
Change in minimum pension liability, net of related taxes					(38)		(38)
Total comprehensive income				1,920	30		1,950
Stock issued	500						500
Cash dividends declared:
Common stock				(358)			(358)
Preferred stock				(20)			(20)
Common stock acquired						(675)	(675)
Common stock acquired,shares						16,313
Common stock awards and options exercised, including related taxes, Shares		1,902				(177)	1,028
Common stock awards and options exercised, including related taxes		2	223			10	235
Other, Shares						(14)
Other			(22)			1	(21)
Balance at Dec. 31, 2011	$ 500	$ 504	$ 9,557	$ 10,176	$ (659)	$ (680)	$ 19,398
Balance, Shares at Dec. 31, 2011		503,966				16,542

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Consolidated Statement Of Changes In Shareholders' Equity (Parenthetical) (USD $) In Millions, except Per Share data, unless otherwise specified	12 Months Ended
Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Consolidated Statement Of Changes In Shareholders' Equity [Abstract]
Change in net unrealized loss on available-for-sale securities, reclassification adjustment and expected losses from other-than-temporary impairment related to factors other than credit, related taxes	$ 242	$ 870	$ 2,158
Change in net unrealized loss on fair value hedges of available-for-sale securities, related taxes	(49)	(17)	82
Expected losses from other-than-temporary impairment on held-to-maturity securities related to factors other than credit, related taxes	15	164	(237)
Foreign currency translation, related taxes	68	56	(96)
Change in net unrealized losses on cash flow hedges, related taxes	3		7
Change in minimum pension liability, related taxes	(15)	(11)	23
Cash dividends declared per common share	$ 0.72	$ 0.04	$ 0.04
Common stock awards and options exercised, related taxes	$ (14)	$ (11)	$ (52)

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Consolidated Statement Of Cash Flows (USD $) In Millions, unless otherwise specified	12 Months Ended
Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Operating Activities:
Net income (loss)	$ 1,920	$ 1,556	$ (1,881)
Adjustments to reconcile net income (loss) to net cash provided by (used in) operating activities:
Deferred income tax expense (benefit)	218	1,244	(1,961)
Amortization of other intangible assets	200	179	136
Other non-cash adjustments for depreciation, amortization and accretion	180	(409)	(457)
Extraordinary loss			6,096
(Gains) Losses related to investment securities, net	(67)	286	(141)
Change in trading account assets, net	(183)	(331)	366
Change in accrued income receivable	(89)	(236)	241
Change in collateral deposits	817	(1,900)	1,358
Change in trading liabilities, net	(441)	555
Other, net	819	(121)	(7,988)
Net cash (used in) provided by operating activities	3,374	823	(4,231)
Investing Activities:
Net (increase) decrease in interest-bearing deposits with banks	(36,652)	4,398	29,222
Net increase in securities purchased under resale agreements	(4,117)	(541)	(752)
Proceeds from sales of available-for-sale securities	16,272	24,736	8,274
Proceeds from maturities of available-for-sale securities	44,810	34,250	43,995
Purchases of available-for-sale securities	(78,748)	(65,485)	(58,780)
Net decrease in securities related to AMLF			6,111
Proceeds from sales of held-to-maturity securities		4,676
Proceeds from maturities of held-to-maturity securities	3,653	5,249	4,498
Purchases of held-to-maturity securities	(457)	(426)	(1,600)
Net (increase) decrease in loans	1,638	(1,320)	800
Business acquisitions, net of cash acquired	(214)	(2,332)
Purchases of equity investments and other long-term assets	(69)	(114)	(241)
Purchases of premises and equipment	(298)	(262)	(325)
Other, net	287	363	430
Net cash (used in) provided by investing activities	(53,895)	3,192	31,632
Financing Activities:
Net increase (decrease) in time deposits	(124)	857	1,267
Net increase (decrease) in all other deposits	59,066	7,426	(23,408)
Net decrease in short term borrowings related to AMLF			(6,042)
Net decrease in short-term borrowings	(8,555)	(11,233)	(4,163)
Proceeds from issuance of long-term debt, net of issuance costs	1,986		4,435
Payments for long-term debt and obligations under capital leases	(2,486)	(341)	(29)
Proceeds from issuance of preferred stock	500
Redemption of TARP preferred stock			(2,000)
Proceeds from public offering of common stock, net of issuance costs			2,231
Repurchase of TARP common stock warrant			(60)
Purchases of common stock	(675)
Proceeds from exercises of common stock options	40	10	34
Repurchases of common stock for employee tax withholding	(63)	(44)	(38)
Proceeds from issuances of treasury stock for common stock awards and option exercises	9
Payments for cash dividends	(295)	(20)	(168)
Net cash (used in) provided by financing activities	49,403	(3,345)	(27,941)
Net increase (decrease)	(1,118)	670	(540)
Cash and due from banks at beginning of year	3,311	2,641	3,181
Cash and due from banks at end of year	2,193	3,311	2,641
Supplemental disclosure:
Interest paid	611	763	722
Income taxes paid (refunded), net	305	(11)	884
Non-cash acquisitions of investment securities			14,111
Non-cash acquisitions of loans			2,510
Non-cash investments in premises and equipment and capital leases			126
Non-cash additions of short-term borrowings			$ 20,919

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Summary Of Significant Accounting Policies	12 Months Ended
Dec. 31, 2011
Summary Of Significant Accounting Policies [Abstract]
Summary Of Significant Accounting Policies	Note 1.     Summary of Significant Accounting Policies The accounting and financial reporting policies of State Street Corporation conform to accounting principles generally accepted in the United States of America, referred to as GAAP. State Street Corporation, the parent company, is a financial holding company headquartered in Boston, Massachusetts. Unless otherwise indicated or unless the context requires otherwise, all references in these notes to consolidated financial statements to "State Street," "we," "us," "our" or similar references mean State Street Corporation and its subsidiaries on a consolidated basis. Our principal banking subsidiary, State Street Bank and Trust Company, is referred to as State Street Bank. We have two lines of business:     •   Investment Servicing provides services for U.S. mutual funds, collective investment funds and other investment pools, corporate and public retirement plans, insurance companies, foundations and endowments worldwide. Products include custody, product- and participant-level accounting, daily pricing and administration; master trust and master custody; record-keeping; foreign exchange, brokerage and other trading services; securities finance; deposit and short- term investment facilities; loans and lease financing; investment manager and alternative investment manager operations outsourcing; and performance, risk and compliance analytics to support institutional investors.     •   Investment Management, through State Street Global Advisors, or SSgA, provides a broad range of investment management strategies, specialized investment management advisory services and other financial services, such as securities finance, for corporations, public funds, and other sophisticated investors. Management strategies offered by SSgA include passive and active, such as enhanced indexing and hedge fund strategies, using quantitative and fundamental methods for both U.S. and non-U.S. equity and fixed-income securities. SSgA also offers exchange-traded funds. The preparation of consolidated financial statements requires management to make estimates and assumptions in the application of certain of our accounting policies that may materially affect the reported amounts of assets, liabilities, revenues and expenses. As a result of unanticipated events or circumstances, actual results could differ from those estimates. Events occurring subsequent to the date of our consolidated statement of condition were evaluated for potential recognition or disclosure in our consolidated financial statements through the date we filed this Form 10-K with the SEC. The following is a summary of our significant accounting policies. Basis of Presentation: Our consolidated financial statements include the accounts of the parent company and its majority- and wholly-owned subsidiaries, including State Street Bank. All material inter-company transactions and balances have been eliminated. Certain previously reported amounts have been reclassified to conform to current year presentation. We consolidate subsidiaries in which we hold a majority of the voting rights or exercise control. Investments in unconsolidated subsidiaries, recorded in other assets, generally are accounted for under the equity method of accounting if we have the ability to exercise significant influence over the operations of the investee. For investments accounted for under the equity method, our share of income or loss is recorded in processing fees and other revenue in our consolidated statement of income. Investments not meeting the criteria for equity method treatment are accounted for under the cost method of accounting.   Foreign Currency Translation: The assets and liabilities of our operations with functional currencies other than the U.S. dollar are translated at month- end exchange rates, and revenues and expenses are translated at rates that approximate average monthly exchange rates. Gains or losses from the translation of the net assets of subsidiaries with functional currencies other than the U.S. dollar, net of related taxes, are recorded in accumulated other comprehensive income, a component of shareholders' equity.   Cash and Cash Equivalents: For purposes of the consolidated statement of cash flows, cash and cash equivalents are defined as cash and due from banks.   Interest-bearing Deposits with Banks: Interest-bearing deposits with banks generally consist of highly liquid, short-term investments maintained at the Federal Reserve Bank and other central banks with original maturities at the time of purchase of one month or less.   Securities Purchased Under Resale Agreements and Securities Sold Under Repurchase Agreements: U.S. Treasury and federal agency securities, referred to as "U.S. government securities," purchased under resale agreements or sold under repurchase agreements are treated as collateralized financing transactions, and are recorded in our consolidated statement of condition at the amounts at which the securities will be subsequently resold or repurchased, plus accrued interest. Our policy is to take possession or control of securities underlying resale agreements, allowing borrowers the right of collateral substitution and/or short-notice termination. We revalue these securities daily to determine if additional collateral is necessary from the borrower to protect us against credit exposure. We can use these securities as collateral for repurchase agreements. For securities sold under repurchase agreements collateralized by our U.S. government securities portfolio, the dollar value of the U.S. government securities remains in investment securities in our consolidated statement of condition. Where a master netting agreement exists or both parties are members of a common clearing organization, resale and repurchase agreements with the same counterparty or clearing house and maturity date are reported on a net basis.   Investment Securities: Investment securities held by us are classified as either trading account assets, investment securities available for sale or investment securities held to maturity at the time of purchase, based on management's intent. Trading account assets are debt and equity securities purchased in connection with our trading activities and, as such, are expected to be sold in the near term. Our trading activities typically involve active and frequent buying and selling with the objective of generating profits on short-term movements. Securities available for sale are those that we intend to hold for an indefinite period of time. Available-for-sale securities include securities utilized as part of our asset and liability management activities that may be sold in response to changes in interest rates, prepayment risk, liquidity needs or other factors. Securities held to maturity are debt securities that management has the intent and the ability to hold to maturity. Trading account assets are carried at fair value. Both realized and unrealized gains and losses on trading account assets are recorded in trading services revenue in our consolidated statement of income. Debt and marketable equity securities classified as available for sale are carried at fair value, and after-tax net unrealized gains and losses are recorded in accumulated other comprehensive income. Gains or losses realized on sales of available-for-sale securities are computed using the specific identification method and are recorded in gains related to investment securities, net, in our consolidated statement of income. Securities held to maturity are carried at cost, adjusted for amortization of premiums and accretion of discounts. We review the fair values of debt securities at least quarterly, and evaluate individual securities for impairment that may be deemed to be other than temporary. For impaired securities that we plan to sell, or when it is more likely than not that we will be forced to sell the security, the impairment is deemed to be other than temporary and the security is written down to its fair value. Otherwise, we determine whether or not we expect to recover the entire amortized cost basis of the security, primarily by comparing the present value of expected future principal, interest and other contractual cash flows to the security's amortized cost basis. Our evaluation of impairment of mortgage- and asset-backed securities incorporates detailed information with respect to underlying loan-level performance. Accordingly, the range of estimates pertaining to each collateral type reflects the unique characteristics of the underlying loans, such as payment options and collateral geography, among other factors.   When we conclude that other-than-temporary impairment exists and we have no intention to sell, or will not be forced to sell, the security, the impairment is separated into the amount related to credit losses and the amount related to factors other than credit. The amount related to credit losses is recognized in our consolidated statement of income in gains (losses) related to investment securities, net, and the amortized cost basis of the security is written down by this amount. The portion of impairment related to all other factors is recognized in other comprehensive income. Interest revenue related to debt securities is recognized in our consolidated statement of income using the interest method, or on a basis approximating a level rate of return over the contractual or estimated life of the security. The level rate of return considers any nonrefundable fees or costs, as well as purchase premiums or discounts, resulting in amortization or accretion, accordingly. With respect to debt securities acquired, for those which we consider it probable as of the date of acquisition that we will be unable to collect all contractually required principal, interest and other payments, the excess of our estimate of undiscounted future cash flows from these securities over their initial recorded investment is accreted into interest revenue on a level-yield basis over the securities' estimated remaining terms. Subsequent decreases in these securities' expected future cash flows are either recognized prospectively through an adjustment of the yields on the securities over their remaining terms, or are evaluated for other-than-temporary impairment as described above. Increases in expected future cash flows are recognized prospectively over the securities' estimated remaining terms through the recalculation of their yields. With respect to certain debt securities acquired which are considered to be beneficial interests in securitized financial assets, the excess of our estimate of undiscounted future cash flows from these securities over their initial recorded investment is accreted into interest revenue on a level-yield basis over the securities' estimated remaining terms. Subsequent decreases in these securities' expected future cash flows are either recognized prospectively through an adjustment of the yields on the securities over their remaining terms, or are evaluated for other-than-temporary impairment as described above. Increases in expected future cash flows are recognized prospectively over the securities' estimated remaining terms through the recalculation of their yields.   Loans and Leases: Loans generally are recorded at their principal amount outstanding, net of the allowance for loan losses, unearned income, and any net unamortized deferred loan origination fees. Acquired loans are recorded at fair value, based on management's expectation with respect to future principal and interest collection as of the date of acquisition. Loans acquired with evidence of deterioration in credit quality subsequent to origination, and for which our inability to collect all contractually required payments is probable on the date of acquisition, are recorded at fair value. The excess of expected future cash flows from these loans over their initial recorded investment is accreted into interest revenue on a level- yield basis over the remaining life of the loans. The carrying amount of acquired loans is assessed on an ongoing basis using a discounted cash flow model, which incorporates management expectations of prepayments. Subsequent decreases in expected cash flows result in an addition to the related allowance to allow the loan to maintain its level yield. Increases in expected cash flows are recognized, first, as a reduction of any remaining allowance, and then are recognized prospectively over the remaining life of the loan through a recalculation of the loan's level yield. Interest revenue related to loans is recognized in our consolidated statement of income using the interest method or on a basis approximating a level rate of return over the term of the loan. Fees received for providing loan commitments and letters of credit that we anticipate will result in loans typically are deferred and amortized to interest revenue over the life of the related loan, beginning with the initial borrowing. Fees on commitments and letters of credit are amortized to processing fees and other revenue over the commitment period when funding is not known or expected. For all loan classes, other than loans acquired with evidence of deterioration in credit quality, loans are placed on non- accrual status when they become 60 days past-due as to either principal or interest, or earlier when full collection of principal or interest is not considered probable. Loans 60 days past-due, but considered both well secured and in the process of collection, are treated as exceptions and may be excluded from non-accrual status. When we place a loan on non-accrual status, the accrual of interest is discontinued and previously recorded but unpaid interest is reversed and generally charged against interest revenue. For loans on non-accrual status, revenue is recognized on a cash basis after recovery of principal, if and when interest payments are received. Loans may be removed from non-accrual status when repayment is reasonably assured and performance under the terms of the loan has been demonstrated. In certain circumstances, we restructure troubled loans by granting concessions to borrowers experiencing financial difficulty. Once restructured, the loans are generally considered impaired until their maturity, regardless of whether the borrowers perform under the modified terms of the loans. Leveraged lease investments are reported at the aggregate of lease payments receivable and estimated residual values, net of non-recourse debt and unearned income. Lease residual values are reviewed regularly for other-than-temporary impairment, with valuation adjustments recorded currently against processing fees and other revenue. Unearned income is recognized to yield a level rate of return on the net investment in the leases. Gains and losses on residual values of leased equipment sold are recorded in processing fees and other revenue.   Allowance for Loan Losses: The allowance for loan losses, recorded as a reduction of loans and leases in our consolidated statement of condition, represents management's estimate of probable credit losses inherent in our loan and lease portfolio as of the balance sheet date. The allowance is evaluated on a regular basis by management. Factors considered in evaluating the appropriate level of the allowance for both the institutional and commercial real estate segments of our loan and lease portfolio include previous loss experience, current economic conditions and adverse situations that may affect the borrower's ability to repay, the estimated value of the underlying collateral, if any, the performance of individual credits in relation to contract terms, and other relevant factors. Provisions for loan losses reflect our estimate of the amount necessary to maintain the allowance at a level considered by us to be appropriate to absorb estimated probable credit losses inherent in the loan and lease portfolio. Loans are charged off to the allowance for loan losses in the reporting period in which either an event occurs that confirms the existence of a loss on a loan or a portion of a loan is determined to be uncollectible. In addition, any impaired loan that is determined to be collateral dependent is reduced to an amount equal to the fair value of the collateral less costs to sell. A loan is identified as collateral dependent when management determines that it is probable that the underlying collateral will be the sole source of repayment. Recoveries are recorded as adjustments to the allowance on a cash basis. In addition, we maintain a reserve for off-balance sheet credit exposures that is recorded in other liabilities in our consolidated statement of condition. Factors considered in evaluating the appropriate level of this reserve are similar to those considered with respect to the allowance for loan losses. Provisions to change the level of this reserve are recorded in other expenses in our consolidated statement of income.   Premises and Equipment: Buildings, leasehold improvements, computers, software and other equipment are carried at cost less accumulated depreciation and amortization. Depreciation and amortization, recorded in occupancy expense and information systems and communications expense in our consolidated statement of income, are computed using the straight-line method over the estimated useful lives of the related assets or the remaining terms of the leases, generally three to forty years. Maintenance and repairs are charged to expense as incurred, while major leasehold improvements are capitalized and expensed over their estimated useful lives or the remaining terms of the lease. For premises held under leases for which we have an obligation to restore the facilities to their original condition upon expiration of the lease, we expense the anticipated related costs over the term of the lease. Costs related to internal-use software development projects that provide significant new functionality are capitalized. We consider projects for capitalization that are expected to yield long-term operational benefits, such as applications that result in operational efficiencies and/or incremental revenue streams. Goodwill and Other Intangible Assets: Goodwill represents the excess of the cost of an acquisition over the fair value of the net tangible and other intangible assets acquired. Other intangible assets represent purchased assets that can be distinguished from goodwill because of contractual rights or because the asset can be exchanged on its own or in combination with a related contract, asset or liability. Goodwill is not amortized, but is subject to annual evaluation for impairment. Other intangible assets related to customer relationships generally are amortized on a straight-line basis over periods ranging from five to twenty years, and core deposit intangible assets over periods ranging from sixteen to twenty-two years, with amortization recorded in other expenses. Impairment of goodwill is deemed to exist if the carrying value of a reporting unit, including its allocation of goodwill and other intangible assets, exceeds its estimated fair value. Impairment of other intangible assets is deemed to exist if the balance of the other intangible asset exceeds the cumulative expected net cash inflows related to the asset over its remaining estimated useful life. If these reviews determine that goodwill or other intangible assets are impaired, the value of the goodwill or the other intangible asset is written down through a charge to other expenses.   Fee and Net Interest Revenue: Fees from investment servicing, investment management, securities finance, trading services and certain types of processing fees and other revenue are recorded in our consolidated statement of income based on estimates or specific contractual terms as transactions occur or services are rendered, provided that persuasive evidence exists, the price to the client is fixed or determinable and collectability is reasonably assured. Amounts accrued at period-end are recorded in accrued income receivable in our consolidated statement of condition. Performance fees from investment management are recorded when earned, based on predetermined benchmarks associated with the applicable fund's performance. Interest revenue on interest-earning assets and interest expense on interest-bearing liabilities are recorded in our consolidated statement of income as components of net interest revenue, and are generally based on the effective yield of the related financial asset or liability.   Employee Benefits Expense: Employee benefits expense, recorded in our consolidated statement of income, includes costs of certain pension and other post-retirement benefit plans related to prior and current service, which are accrued on a current basis, as well as contributions associated with defined contribution savings plans, unrestricted cash and stock awards under other employee incentive compensation plans, and the amortization of restricted stock awards.   Equity-Based Compensation: We record compensation expense for equity-based awards. Accordingly, we measure compensation expense at fair value on a straight-line basis over the service or performance period, net of estimated forfeitures. The fair values of equity-based awards, such as restricted stock, deferred stock and performance awards, are based on the closing price of our common stock on the date of grant, adjusted if appropriate based upon the award's eligibility to receive dividends. The fair value of stock options and stock appreciation rights is determined using the Black-Scholes valuation model. Compensation expense related to equity-based awards with service-only conditions and terms that provide for a graded vesting schedule are recognized on a straight-line basis over the required service period for the entire award. Compensation expense related to equity-based awards with performance conditions and terms that provide for a graded vesting schedule is recognized over the requisite service period for each separately vesting tranche of the award, and is based on the probable outcome of the performance conditions at each reporting date. The expense is adjusted for assumptions with respect to the estimated amount of awards that will be forfeited prior to vesting, and for employees who have met certain retirement eligibility criteria.   Dividend equivalents for certain equity-based awards are paid on stock units on a current basis prior to vesting and distribution. Compensation expense for common stock and cash awards granted to employees meeting early retirement eligibility criteria is fully expensed and accrued at the grant date. Income Taxes: We use an asset and liability approach to account for income taxes. Our objective is to recognize the amount of taxes payable or refundable for the current year through charges or credits to the current tax provision, and to recognize deferred tax assets and liabilities for the future tax consequences resulting from temporary differences between the amounts reported in our consolidated financial statements and their respective tax bases. The measurement of tax assets and liabilities is based on enacted tax laws and applicable tax rates. The effects of a tax position on our consolidated financial statements are recognized when we believe it more likely than not that the position will be sustained. A deferred tax valuation allowance is established if it is considered more likely than not that all or a portion of the deferred tax assets will not be realized. Deferred tax assets and liabilities are netted within the same tax jurisdiction.   Earnings Per Share: Basic earnings per share, or EPS, is calculated pursuant to the "two-class" method, using net income available to common shareholders and the weighted-average number of common shares outstanding during the period. Diluted EPS is calculated pursuant to the two-class method, by dividing net income available to common shareholders by the weighted-average number of common shares outstanding for the period and the shares representing the dilutive effect of common stock options and other equity-based awards. The effect of common stock options and other equity-based awards is excluded from the calculation of diluted EPS in periods in which their effect would be anti-dilutive. The two-class method requires the allocation of undistributed net income between common and participating shareholders. Net income available to common shareholders, presented separately in our consolidated statement of income, is the basis for the calculation of both basic and diluted EPS. Participating securities are composed of unvested restricted stock and director stock awards, which are equity-based awards that contain non-forfeitable rights to dividends, and are considered to participate with common shareholders in undistributed earnings.   Fair Value Measurements: We carry certain of our financial assets and liabilities at fair value on a recurring basis. These financial assets and liabilities are composed of trading account assets, investment securities available for sale and various types of derivative financial instruments. In addition, we measure certain assets, such as goodwill, investment securities held to maturity and other long-lived assets, at fair value on a non-recurring basis to evaluate those assets for potential impairment. Fair value is defined as the price that would be received to sell an asset or paid to transfer a liability in an orderly transaction between market participants at the measurement date. We categorize our financial assets and liabilities into the following fair value hierarchy: Level 1 – Financial assets and liabilities with values based on unadjusted quoted prices for identical assets or liabilities in an active market. Examples of level 1 financial instruments include active exchange-traded equity securities and certain U.S. government securities. Level 2 – Financial assets and liabilities with values based on quoted prices for similar assets and liabilities in active markets, and inputs that are observable for the asset or liability, either directly or indirectly, for substantially the full term of the asset or liability. Examples of level 2 financial instruments include various types of fixed-income investment securities and interest-rate and foreign exchange derivative instruments. Pricing models are utilized to estimate fair value for certain financial assets and liabilities categorized in level 2.   Level 3 – Financial assets and liabilities with values based on prices or valuation techniques that require inputs that are both unobservable in the market and significant to the overall fair value measurement. These inputs reflect management's judgment about the assumptions that a market participant would use in pricing the asset or liability, and are based on the best available information, some of which is internally developed. Examples of level 3 financial instruments include certain asset- and mortgage-backed securities and certain derivative instruments with little or no market activity and a resulting lack of price transparency. When determining the fair value measurements for financial assets and liabilities carried at fair value on a recurring basis, we consider the principal or most advantageous market in which we would transact and consider assumptions that market participants would use when pricing the asset or liability. When possible, we look to active and observable markets to price identical assets or liabilities. When identical assets and liabilities are not traded in active markets, we look to market observable data for similar assets and liabilities. Nevertheless, certain assets and liabilities are not actively traded in observable markets, and we use alternative valuation techniques to derive fair value measurements. Variable Interest Entities: We are involved in the normal course of our business with various types of special purpose entities, some of which are variable interest entities, or VIEs, as defined by GAAP. We also invest in various forms of asset-backed securities, which we carry in our investment securities portfolio. These asset-backed securities meet the GAAP definition of asset securitization entities, which entities are considered to be VIEs. We are not considered to be the primary beneficiary of these VIEs, as defined by GAAP, since we do not have control over their activities. We use special purpose entities to structure and sell certificated interests in pools of tax-exempt investment-grade assets, principally to our mutual fund clients. These trusts are recorded in our consolidated financial statements. We transfer assets to these trusts, which are legally isolated from us, from our investment securities portfolio at adjusted book value. The trusts finance the acquisition of these assets by selling certificated interests issued by the trusts to third-party investors and to State Street as residual holder. The investment securities of the trusts are carried at fair value in investment securities available for sale. The certificated interests are carried at the amount owed to the third-party investors in other short-term borrowings. The interest revenue and interest expense generated by the investments and certificated interests, respectively, are recorded as components of net interest revenue when earned or incurred.   Derivative Financial Instruments: A derivative financial instrument is a financial instrument or other contract which has one or more referenced indices and one or more notional amounts, either no initial net investment or a smaller initial net investment than would be expected for similar types of contracts, and which requires or permits net settlement. Derivatives that we enter into include forwards, futures, swaps, options and other instruments with similar characteristics. We record derivatives in our consolidated statement of condition at their fair value. On the date a derivative contract is entered into, we designate the derivative as: (1) a hedge of the fair value of a recognized fixed-rate asset or liability or of an unrecognized firm commitment (a "fair value" hedge); (2) a hedge of a forecasted transaction or of the variability of cash flows to be received or paid related to a recognized variable-rate asset or liability (a "cash flow" hedge); (3) a foreign currency fair value or cash flow hedge (a "foreign currency" hedge); (4) a hedge of a net investment in a non-U.S. operation; or (5) a derivative utilized in either our trading activities or in our asset and liability management activities that is not accounted for as a hedge of an asset or liability.   Changes in the fair value of a derivative that is highly effective—and that is designated and qualifies as a fair value hedge—are recorded currently in processing fees and other revenue, along with the changes in fair value of the hedged asset or liability attributable to the hedged risk. Changes in the fair value of a derivative that is highly effective—and that is designated and qualifies as a cash flow hedge—are recorded, net of tax, in other comprehensive income, until earnings are affected by the hedged cash flows (e.g., when periodic settlements on a variable-rate asset or liability are recorded in earnings). Ineffectiveness of cash flow hedges, defined as the extent to which the changes in fair value of the derivative exceed the variability of cash flows of the forecasted transaction, is recorded in processing fees and other revenue. Changes in the fair value of a derivative that is highly effective—and that is designated and qualifies as a foreign currency hedge—are recorded currently either in processing fees and other revenue or in other comprehensive income, net of tax, depending on whether the hedge transaction meets the criteria for a fair value or a cash flow hedge. If, however, a derivative is used as a hedge of a net investment in a non-U.S. operation, its changes in fair value, to the extent effective as a hedge, are recorded, net of tax, in the foreign currency translation component of other comprehensive income. Lastly, entire changes in the fair value of derivatives utilized in our trading activities are recorded in trading services revenue, and entire changes in the fair value of derivatives utilized in our asset and liability management activities are recorded in processing fees and other revenue. At both the inception of the hedge and on an ongoing basis, we formally assess and document the effectiveness of a derivative designated as a hedge in offsetting changes in the fair value of hedged items and the likelihood that the derivative will be an effective hedge in future periods. We discontinue hedge accounting prospectively when we determine that the derivative is no longer highly effective in offsetting changes in fair value or cash flows of the underlying risk being hedged, the derivative expires, terminates or is sold, or management discontinues the hedge designation. Unrealized gains and losses on foreign exchange and interest-rate contracts are reported at fair value in our consolidated statement of condition as a component of other assets and other liabilities, respectively, on a gross basis, except where such gains and losses arise from contracts covered by qualifying master netting agreements.   Recent Accounting Developments: The FASB is currently deliberating potentially significant changes to the U.S. accounting framework as part of an overall convergence effort with the International Accounting Standards Board under a previously signed memorandum of understanding. Some of these proposed changes have been exposed for comment, while others are expected to be exposed for comment over the next six to twelve months. These new proposals include potential changes to the accounting for financial instruments and hedging, the accounting for leases, revenue recognition and financial statement presentation. Once these proposed changes are finalized, we will disclose their nature and potential effect, if any, on our consolidated financial statements in our future filings. These proposed changes may have a material effect on our consolidated financial statements. In September 2011, the FASB issued an amendment to GAAP that modifies existing guidance with respect to impairment of goodwill. The amendment provides companies with an option to perform a qualitative assessment to determine whether further impairment testing is necessary. The amendment is effective, for State Street, for interim and annual periods beginning on January 1, 2012. Adoption of the amendment is not expected to have a material effect on our consolidated financial statements. In June 2011, the FASB issued an amendment to GAAP that eliminates the option to report other comprehensive income and its components in the statement of changes in shareholders' equity. Instead, an entity can elect to present the components of net income and other comprehensive income in either one continuous statement, referred to as the statement of comprehensive income, or in two separate, but consecutive statements. The amendment does not change which items are reported in other comprehensive income or the requirement to report reclassifications of items from other comprehensive income to net income. The amendment is effective, for State Street, for interim and annual periods beginning on January 1, 2012, and is required to be applied retrospectively. We are currently evaluating the options for presentation of other comprehensive income permitted by the amendment.   In May 2011, the FASB issued an amendment to GAAP associated with fair value measurement and related disclosures. While the amendment is not expected to significantly affect current practice, it clarifies the FASB's intent about the application of existing fair value measurement requirements, and requires the disclosure of additional quantitative information about fair value measurements. The amendment includes guidance about, among other things, the determination of a principal market and the measurement of fair value of instruments with offsetting market or counterparty credit risks. The amendment is effective, for State Street, for interim and annual periods beginning on January 1, 2012, and is required to be applied prospectively. Adoption of the amendment is not expected to have a material effect on our consolidated financial statements from a fair value measurement perspective. However, adoption is expected to result in additional disclosures in our consolidated financial statements. In April 2011, the FASB issued an amendment to GAAP that eliminates the requirement to consider collateral maintenance when determining whether a transfer of assets subject to a repurchase arrangement is accounted for as a sale or as a secured borrowing. The amendment is effective prospectively, for State Street, for new transactions and modifications of existing transactions that occur on or after January 1, 2012. Adoption of the amendment is not expected to have a material effect on our consolidated financial statements, since we currently account for repurchase agreements as secured borrowings.

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Acquisitions	12 Months Ended
Dec. 31, 2011
Acquisitions [Abstract]
Acquisitions	Note 2.     Acquisitions On November 3, 2011 and October 3, 2011, respectively, we completed our acquisitions of Pulse Trading, Inc., a full- service agency brokerage firm based in Boston, Massachusetts, and Complementa Investment-Controlling AG, an investment performance measurement and analytics firm based in Switzerland. Both transactions were cash acquisitions financed through available capital. Pulse Trading offers a broad range of services to institutional investors, including trading, independent research, portfolio consulting and trading technology, and has offices in Boston, Massachusetts; New York City, New York; San Francisco, California and St. Louis, Missouri. We acquired Pulse Trading to enhance the electronic trading technology we provide to our institutional clients. Our acquisition of Pulse Trading includes its institutional equities business. Complementa provides services associated with asset consolidation, investment performance measurement, investment controlling and investment consulting for institutional and large private investors, and has offices in Switzerland, Germany and Liechtenstein. We acquired Complementa to enhance our investment analytics capabilities and our overall presence in key markets in Europe. Our acquisition of Complementa includes its wholly-owned asset management software provider. In connection with these two acquisitions, we recorded aggregate goodwill of approximately $68 million, substantially all of which is not expected to be tax deductible, and aggregate other intangible assets of approximately $67 million in our consolidated statement of condition. The purchase price allocations for the acquisitions were preliminary as of December 31, 2011, and are subject to future adjustment as information needed to measure the acquisition-date fair values of certain identifiable assets acquired and liabilities assumed is obtained. Accordingly, the measurement periods for both acquisitions remained open as of December 31, 2011. Results of operations of the acquired Pulse Trading and Complementa businesses are included in our consolidated financial statements beginning on their respective dates of acquisition. On January 10, 2011, we completed our acquisition of Bank of Ireland's asset management business, or BIAM, in a cash acquisition financed through available capital. We acquired BIAM to enhance SSgA's range of investment management solutions and expand our overall presence in Ireland, where we already provide services to institutional clients, to provide a range of investment management products. In connection with our acquisition of BIAM, we recorded approximately $31 million of goodwill, substantially all of which is not expected to be tax deductible, and approximately $27 million of other intangible assets in our consolidated statement of condition, and added approximately $23 billion to our assets under management as of March 31, 2011. The assets under management are not recorded in our consolidated financial statements. Results of operations of the acquired BIAM business are included in our consolidated financial statements beginning on January 10, 2011.   In May 2010, we completed our acquisition of Intesa Sanpaolo's securities services business in a cash acquisition financed through available capital. Results of operations of the acquired Intesa business have been included in our consolidated financial statements from the date the acquisition was completed. In connection with the acquisition, the assets acquired, liabilities assumed and consideration paid were recorded in our consolidated statement of condition at their estimated fair values on the acquisition date. These assets included $932 million of goodwill and $848 million of other intangible assets, including assets related to client relationships and core deposits. The goodwill, substantially all of which is not expected to be tax deductible, represents the expected long-term value of cost savings, growth opportunities and business efficiencies created by the integration of the acquired Intesa business. We also added approximately $564 billion to our assets under custody and administration as of June 30, 2010. These assets are not recorded in our consolidated financial statements. With respect to the acquired Intesa business, we may be entitled to a return of a portion of the purchase price, should we lose the business of certain key clients during a defined period subsequent to the closing of the transaction. This contingent asset, which was approximately $53 million as of December 31, 2011, compared to approximately $72 million as of December 31, 2010, will be re-measured to fair value at each reporting date through the end of the defined purchase price adjustment period, with any changes in its fair value recorded in our consolidated statement of income. During the fourth quarter of 2010, Italian tax authorities issued an assessment for taxes, penalties and interest for corporate income tax, regional tax and withholding taxes of approximately €130 million to an Italian banking subsidiary acquired by us in connection with the acquisition. The assessment related to 2005, a pre-acquisition tax year. State Street was indemnified for this liability under the acquisition agreement, which further required the indemnity obligation to be collateralized in the event of a tax assessment and provided that the seller had the right to control the defense of indemnified claims. During the fourth quarter of 2011, the Italian banking subsidiary reached a settlement agreement with the Italian tax authorities regarding these assessments, as well as the Italian tax authorities' audit of the 2006 tax year. As such, we recorded the impact of the tax settlement and associated indemnification in our 2011 consolidated financial statements. In April 2010, we completed our acquisition of Mourant International Finance Administration, or MIFA, in a cash transaction financed through available capital. We acquired MIFA to enhance our position as an administrator of alternative investments and to expand our presence outside of the U.S. In connection with our acquisition of MIFA, a provider of fund administration services, particularly for alternative investment funds such as private equity, real estate and hedge funds with operations in Jersey in the Channel Islands, Dublin, Singapore and New York, we recorded $73 million of goodwill, substantially all of which is not expected to be tax deductible, and $59 million of other intangible assets in our consolidated statement of condition, and added $122 billion to our assets under administration as of June 30, 2010. The assets under administration are not recorded in our consolidated financial statements. Results of operations of the acquired MIFA business are included in our consolidated financial statements beginning on April 1, 2010.

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Investment Securities	12 Months Ended
Dec. 31, 2011
Investment Securities [Abstract]
Investment Securities	Note 3. Investment Securities The following table presents the amortized cost and fair value, and associated unrealized gains and losses, of investment securities as of December 31:                                                                              2011      2010   (In millions)    Amortized Cost      Gross Unrealized      Fair Value      Amortized Cost      Gross Unrealized      Fair Value         Gains      Losses            Gains      Losses      Available for sale:                                                                         U.S. Treasury and federal agencies:                                                                         Direct obligations    $ 2,798       $ 39       $ 1       $ 2,836       $ 7,505       $ 74       $ 2       $ 7,577    Mortgage-backed securities      29,511         538         28         30,021         23,398         325         83         23,640    Asset-backed securities:                                                                         Student loans (1)      17,187         69         711         16,545         14,975         92         652         14,415    Credit cards      10,448         53         14         10,487         7,578         56         31         7,603    Sub-prime      1,849         2         447         1,404         2,161         3         346         1,818    Other      3,421         169         125         3,465         2,550         175         156         2,569                                                                              Total asset-backed securities      32,905         293         1,297         31,901         27,264         326         1,185         26,405                                                                              Non-U.S. debt securities:                                                                         Mortgage-backed securities      10,890         92         107         10,875         6,258         82         46         6,294    Asset-backed securities      4,318         2         17         4,303         1,790         13         17         1,786    Government securities      1,671         —           —           1,671         2,005         —           —           2,005    Other      2,797         41         13         2,825         1,900         34         2         1,932                                                                              Total non-U.S. debt securities      19,676         135         137         19,674         11,953         129         65         12,017                                                                              State and political subdivisions      6,924         244         121         7,047         6,706         102         204         6,604    Collateralized mortgage obligations      3,971         62         53         3,980         1,828         49         16         1,861    Other U.S. debt securities      3,471         159         15         3,615         2,438         116         18         2,536    U.S. equity securities      639         1         —           640         1,115         —           —           1,115    Non-U.S. equity securities      118         —           —           118         122         5         1         126                                                                              Total    $ 100,013       $ 1,471       $ 1,652       $ 99,832       $ 82,329       $ 1,126       $ 1,574       $ 81,881                                                                                                Held to maturity:                                                                         U.S. Treasury and federal agencies:                                                                         Mortgage-backed securities    $ 265       $ 18              $ 283       $ 413       $ 26                $ 439    Asset backed securities      31         —         $ 2         29         64         —         $ 5         59    Non-U.S. debt securities:                                                                         Mortgage-backed securities      4,973         87         224         4,836         6,332         166         160         6,338    Asset-backed securities      436         16         3         449         646         18         3         661    Government securities      3         —           —           3         —           —           —           —      Other      172         —           17         155         208         —           2         206    Total non-U.S. debt securities      5,584         103         244         5,443         7,186         184         165         7,205                                                                              State and political subdivisions      107         3         —           110         134         3         —           137    Collateralized mortgage obligations      3,334         220         57         3,497         4,452         328         44         4,736                                                                              Total    $ 9,321       $ 344       $ 303       $ 9,362       $ 12,249       $ 541       $ 214       $ 12,576                                                                              (1) Substantially composed of securities guaranteed by the federal government with respect to the payment of principal and interest.    Aggregate investment securities carried at $44.66 billion and $44.81 billion at December 31, 2011 and 2010, respectively, were designated as pledged for public and trust deposits, short-term borrowings and for other purposes as provided by law.     The following table presents contractual maturities of debt investment securities as of December 31, 2011:                                     (In millions)    Under 1 Year      1 to 5 Years      6 to 10 Years      Over 10 Years   Available for sale:                                     U.S. Treasury and federal agencies:                                     Direct obligations    $ 1,200       $ 38       $ 822       $ 776    Mortgage-backed securities      5         755         10,871         18,390    Asset-backed securities:                                     Student loans      155         3,331         8,490         4,569    Credit cards      1,893         5,893         2,701         —      Sub-prime      581         82         17         724    Other      119         1,602         1,198         546    Total asset-backed securities      2,748         10,908         12,406         5,839                                          Non-U.S. debt securities:                                     Mortgage-backed securities      474         2,358         987         7,056    Asset-backed securities      230         916         2,511         646    Government securities      1,671         —           —           —      Other      1,636         958         231         —      Total non-U.S. debt securities      4,011         4,232         3,729         7,702                                          State and political subdivisions      471         2,326         3,328         922    Collateralized mortgage obligations      81         1,163         1,209         1,527    Other U.S. debt securities      289         1,391         1,899         36              Total    $ 8,805       $ 20,813       $ 34,264       $ 35,192                                                    Held to maturity:                                     U.S. Treasury and federal agencies:                                     Mortgage-backed securities           $ 19       $ 102       $ 144    Asset-backed securities             —           —           31    Non-U.S. debt securities:                                     Mortgage-backed securities    $ 1,304         254         —           3,415    Asset-backed securities      —           204         217         15    Government securities      3         —           —           —      Other      —           155         —           17                                          Total non-U.S. debt securities      1,307         613         217         3,447    State and political subdivisions      56         49         2         —      Collateralized mortgage obligations      394         1,350         530         1,060              Total    $ 1,757       $ 2,031       $ 851       $ 4,682                                          The maturities of asset-backed securities, mortgage-backed securities and collateralized mortgage obligations are based on expected principal payments.   Impairment: We conduct periodic reviews of individual securities to assess whether other-than-temporary impairment exists. Impairment exists when the current fair value of an individual security is below its amortized cost basis. When the decline in the security's fair value is deemed to be other than temporary, the loss is recorded in our consolidated statement of income. For debt securities available for sale and held to maturity, impairment is recorded in our consolidated statement of income when management intends to sell (or may be required to sell) the securities before they recover in value, or when management expects the present value of cash flows expected to be collected from the securities to be less than the amortized cost of the impaired security (a credit loss).   Our review of impaired securities generally includes:     •   the identification and evaluation of securities that have indications of possible other-than-temporary impairment, such as issuer-specific concerns, including deteriorating financial condition or bankruptcy;     •   the analysis of expected future cash flows of securities, based on quantitative and qualitative factors;     •   the analysis of the collectability of those future cash flows, including information about past events, current conditions and reasonable and supportable forecasts;     •   the analysis of the underlying collateral for asset- and mortgage-backed securities;     •   the analysis of individual impaired securities, including consideration of the length of time the security has been in an unrealized loss position, the anticipated recovery period, and the magnitude of the overall price decline;     •   discussion and evaluation of factors or triggers that could cause individual securities to be deemed other-than- temporarily impaired and those that would not support other-than-temporary impairment; and     •   documentation of the results of these analyses. Factors considered in determining whether impairment is other than temporary include:     •   the length of time the security has been impaired;     •   the severity of the impairment;     •   the cause of the impairment and the financial condition and near-term prospects of the issuer;     •   activity in the market with respect to the issuer's securities, which may indicate adverse credit conditions; and     •   our intention not to sell, and the likelihood that we will not be required to sell, the security for a period of time sufficient to allow for recovery in value. The substantial majority of our investment securities portfolio is composed of debt securities. A critical component of the evaluation for other-than-temporary impairment of our debt securities is the identification of credit-impaired securities for which management does not expect to receive cash flows sufficient to recover the entire amortized cost basis of the security. Debt securities that are not deemed to be credit-impaired are subject to additional management analysis to assess whether management intends to sell, or, more likely than not, would be required to sell, the security before the expected recovery to its amortized cost basis. The following describes our process for identifying credit impairment in security types with the most significant unrealized losses as of December 31, 2011. Mortgage- and Asset-Backed Securities For certain vintages of U.S. mortgage-backed securities (in particular, sub-prime first-lien mortgages, "Alt-A" mortgages and home equity lines of credit (2006 and 2007 originations) that have significant unrealized losses as a percentage of their amortized cost), other-than-temporary impairment related to credit is assessed using cash flow models, tailored for each security, that estimate the future cash flows from the underlying mortgages, using the security-specific collateral and transaction structure. Estimates of future cash flows are subject to management judgment. The future cash flows and performance of our portfolio of U.S. mortgage-backed securities are a function of a number of factors, including, but not limited to, the condition of the U.S. economy, the condition of the U.S. residential mortgage markets, and the level of loan defaults, prepayments and loss severities. Management's estimates of future losses for each security also consider the underwriting and historical performance of our specific securities, the underlying collateral type, vintage, borrower profile, third-party guarantees, current levels of subordination, geography and other factors.   The following tables present the parameters used in the evaluation of 2006- and 2007-vintage U.S. residential mortgage- backed securities as of December 31, 2011 and 2010:         Sub-Prime A       Sub-Prime A       Sub-Prime A        Sub-Prime ARM     Alt-A     Non- Agency Prime   December 31, 2011:                          Prepayment rate      1-3 %      2-6 %      5-10 %  Cumulative loss estimates      46-54        26-39        9-19    Loss severity(1)      70-72        59-61        52-53    Peak-to-trough housing price decline(2)      35        35        35            Sub-Prime ARM       Sub-Prime ARM       Sub-Prime ARM        Sub-Prime ARM     Alt-A     Non- Agency Prime   December 31, 2010:                          Prepayment rate      2-3 %      7 %      7-10 %  Cumulative loss estimates      33        21        13    Loss severity(1)      67        49        49    Peak-to-trough housing price decline(2)      35-40        35-40        35-40    (1) Loss severity rates consider the initial loan-to-value ratio, lien position, geography, expected collateral value and other factors. (2) Management's expectation of the Case-Shiller National Home Price Index.     The following table presents other-than-temporary impairment recorded on securities in these vintages, when both fair value was below carrying value and a credit loss existed, for the years indicated:                                Year Ended December 31, 2011      Year Ended December 31, 2010      Year Ended December 31, 2009 (1)   (In millions)                      Sub-prime ARM    $ 2       $ 26       $ 29    Alt-A      5         43         20    Non-agency prime      5         89         60                                 Total    $ 12       $ 158       $ 109                                 (1)  Represents the period from April 1, 2009 through December 31, 2009, subsequent to the adoption of the revised GAAP related to other-than-temporary impairment. Asset-Backed Securities—Student Loans Asset-backed securities collateralized by student loans are primarily composed of securities collateralized by Federal Family Education Loan Program, or FFELP, loans. FFELP loans benefit from a federal government guarantee of at least 97% of principal, with additional credit support provided in the form of overcollateralization, subordination and excess spread, which collectively total in excess of 100% of principal and interest. Accordingly, the vast majority of FFELP loan-backed securities are not exposed to traditional consumer credit risk. Our total exposure to private student loan-backed securities is less than $1.0 billion; our evaluation of impairment considers the impact of high unemployment rates on the collateral performance of private student loans. Other risk factors are considered in our evaluation of other-than-temporary impairment. Non-U.S. Mortgage- and Asset-Backed Securities Non-U.S. mortgage- and asset-backed securities are composed primarily of U.K., Dutch and Australian securities collateralized by residential mortgages. Our evaluation of impairment considers the location of the underlying collateral, collateral enhancement and structural features, expected credit losses under base-case and stressed conditions and the macroeconomic outlook for the country in which the collateral resides, including housing prices and unemployment. Where appropriate, any potential loss after consideration of the above-referenced factors is further evaluated to determine whether any other-than-temporary impairment exists.   Our aggregate exposure to Spain, Italy, Ireland, Greece and Portugal totaled approximately $1.08 billion as of December 31, 2011. While we had no direct sovereign debt exposure to these countries, we had indirect exposure consisting of mortgage- and asset-backed securities, composed of $424 million in Spain, $373 million in Italy, $114 million in Ireland, $99 million in Greece and $69 million in Portugal. These securities had an aggregate pre-tax gross unrealized loss of approximately $122 million as of December 31, 2011. We recorded no other-than-temporary impairment on these securities in 2011. Our evaluation of potential other-than-temporary impairment of these securities assumes a negative baseline macroeconomic environment for this region, due to the continued sovereign debt crisis, and the combination of slower economic growth and continued government austerity measures. Our baseline view assumes a recessionary period characterized by higher unemployment and by additional house price declines between 5% and 15% across these five countries. Our evaluation of other-than-temporary impairment does not assume a disorderly sovereign debt restructuring or countries leaving the euro common currency, consistent with management's expectations. In addition, stress testing and sensitivity analysis is performed in order to understand the impact of more severe assumptions on potential other-than-temporary impairment. State and Political Subdivisions In assessing other-than-temporary impairment, we may from time to time rely on support from third-party financial guarantors for certain asset-backed and municipal (state and political subdivisions) securities. Factors taken into consideration when determining the level of support include the guarantor's credit rating and management's assessment of the guarantor's financial condition. For those guarantors that management deems to be under financial duress, we assume an immediate default by those guarantors, with a modest recovery of claimed amounts (up to 20%). In addition, for various forms of collateralized securities, management considers the liquidation value of the underlying collateral based on expected housing prices and other relevant factors. The assumptions presented above are used by management to identify those securities which are subject to further analysis of potential credit losses. Additional analyses are performed using more severe assumptions to further evaluate sensitivity of losses relative to the above factors. However, since the assumptions are based on the unique characteristics of each security, management uses a range of point estimates for prepayment speeds and housing prices that reflect the collateral profile of the securities within each asset class. In addition, in measuring expected credit losses, the individual characteristics of each security are examined to determine whether any additional factors would increase or mitigate the expected loss. Once losses are determined, the timing of the loss will also affect the ultimate other-than-temporary impairment, since the loss is ultimately subject to a discount commensurate with the purchase yield of the security. Primarily as a result of rising delinquencies and management's continued expectation of declining housing prices, we recorded credit-related other-than- temporary impairment of $73 million in 2011. After a review of the investment portfolio, taking into consideration current economic conditions, adverse situations that might affect our ability to fully collect principal and interest, the timing of future payments, the credit quality and performance of the collateral underlying asset-backed securities and other relevant factors, and excluding the securities for which other-than- temporary impairment was recorded in 2011, management considers the aggregate decline in fair value of the remaining securities and the resulting gross pre-tax unrealized losses of $1.96 billion related to 1,703 securities as of December 31, 2011 to be temporary and not the result of any material changes in the credit characteristics of the securities.     The following tables present the aggregate fair values of investment securities with a continuous unrealized loss position for less than 12 months and those that have been in a continuous unrealized loss position for longer than 12 months, as of the dates indicated:                                                             Less than 12 months      12 months or longer      Total   December 31, 2011 (In millions)    Fair Value      Gross Unrealized Losses      Fair Value      Gross Unrealized Losses      Fair Value      Gross Unrealized Losses   Available for sale:                                                       U.S. Treasury and federal agencies:                                                       Direct obligations    $ 1,373       $ 1                     $ 1,373       $ 1    Mortgage-backed securities      4,714         26       $ 370       $ 2         5,084         28    Asset-backed securities:                                                       Student loans      2,642         23         10,706         688         13,348         711    Credit cards      2,581         6         1,461         8         4,042         14    Sub-prime      16         1         1,360         446         1,376         447    Other      1,482         19         1,122         106         2,604         125                                                            Total asset-backed      6,721         49         14,649         1,248         21,370         1,297                                                            Non-U.S. debt securities:                                                       Mortgage-backed securities      6,069         55         1,151         52         7,220         107    Asset-backed securities      2,205         14         108         3         2,313         17    Other      1,543         13         —         —         1,543         13                                                            Total non-U.S. debt securities      9,817         82         1,259         55         11,076         137                                                            State and political subdivisions      171         3         1,446         118         1,617         121    Collateralized mortgage obligations      2,024         43         68         10         2,092         53    Other U.S. debt securities      220         2         57         13         277         15                                                            Total    $ 25,040       $ 206       $ 17,849       $ 1,446       $ 42,889       $ 1,652                                                            Held to maturity:                                                       Asset-backed securities                      $ 29       $ 2       $ 29       $ 2    Non-U.S. debt securities:                                                       Mortgage-backed securities    $ 341       $ 6         1,382         218         1,723         224    Asset-backed securities      9         1         70         2         79         3    Other      —         —         138         17         138         17                                                            Total non U.S. debt securities      350         7         1,590         237         1,840         244                                                            Collateralized mortgage obligations      649         32         231         25         880         57                                                            Total    $ 999       $ 39       $ 1,850       $ 264       $ 2,849       $ 303                                                                                                                      Less than 12 months      12 months or longer      Total   December 31, 2010 (In millions)    Fair Value      Gross Unrealized Losses      Fair Value      Gross Unrealized Losses      Fair Value      Gross Unrealized Losses   Available for sale:                                                       U.S. Treasury and federal agencies:                                                       Direct obligations                      $ 153       $ 2       $ 153       $ 2    Mortgage-backed securities    $ 6,639       $ 81         431         2         7,070         83    Asset-backed securities:                                                       Student loans      1,980         25         8,457         627         10,437         652    Credit cards      1,268         5         2,396         26         3,664         31    Sub-prime      —         —         1,769         346         1,769         346    Other      269         3         1,122         153         1,391         156                                                            Total asset-backed securities      3,517         33         13,744         1,152         17,261         1,185                                                            Non-U.S. debt securities:                                                       Mortgage-backed securities      2,621         22         370         24         2,991         46    Asset-backed securities      —         —         54         17         54         17    Other      348         2         —         —         348         2                                                            Total non-U.S. debt securities      2,969         24         424         41         3,393         65                                                            State and political subdivisions      1,097         19         1,967         185         3,064         204    Collateralized mortgage obligations      494         5         109         11         603         16    Other U.S. debt securities      330         7         61         11         391         18    Non-U.S. equity securities      8         1         —         —         8         1                                                            Total    $ 15,054       $ 170       $ 16,889       $ 1,404       $ 31,943       $ 1,574                                                            Held to maturity:                                                       Asset-backed securities                      $ 53       $ 5       $ 53       $ 5    Non-U.S. debt securities:                                                       Mortgage-backed securities    $ 1,445       $ 72         862         88         2,307         160    Asset-backed securities      —         —         68         3         68         3    Other      206         2         —         —         206         2                                                            Total non-U.S. debt securities      1,651         74         930         91         2,581         165                                                            Collateralized mortgage obligations      125         2         575         42         700         44                                                            Total    $ 1,776       $ 76       $ 1,558       $ 138       $ 3,334       $ 214                                                              The following table presents realized gains and losses related to investment securities for the years ended December 31:                           (In millions)    2011     2010     2009   Gross realized gains from sales of investment securities    $ 152      $ 1,330      $ 418    Gross realized losses from sales of investment securities      (12 )      (1,385 )      (50 )  Gross losses from other-than-temporary impairment      (123 )      (651 )      (1,155 )  Losses not related to credit(1)      50        420        928                               Net impairment losses      (73 )      (231 )      (227 )  Gains (Losses) related to investment securities, net    $ 67      $ (286 )    $ 141                               Impairment associated with expected credit losses    $ (42 )    $ (203 )    $ (151 )  Impairment associated with management's intent to sell the impaired securities prior to their recovery in value      (8 )      (1 )      (54 )  Impairment associated with adverse changes in timing of expected future cash flows      (23 )      (27 )      (22 )                             Net impairment losses    $ (73 )    $ (231 )    $ (227 )                             (1) Pursuant to revised GAAP adopted on April 1, 2009, these losses were recorded, net of related taxes, a component of other comprehensive income; refer to note 12. The following table presents activity with respect to credit-related losses recognized in our consolidated statement of income for the years ended December 31, associated with securities considered other-than-temporarily impaired:                             (In millions)        2011           2010          2009(1)   Beginning balance    $ 63      $ 175      $ —    Plus expected credit-related losses for which other-than-temporary impairment was not previously recognized      10        88        214    Plus expected credit-related losses for which other-than-temporary impairment was previously recognized      55        142        —    Less losses realized for securities sold      (13 )      (342 )      (17 )  Less losses realized for securities intended or required to be sold      (2 )      —        (22 )                             Ending balance    $ 113      $ 63      $ 175                               (1)  Beginning balance was as of April 1, 2009, pursuant to revised GAAP. The impairment losses were related to non-agency securities collateralized by U.S. mortgages, which management concluded had experienced credit losses based on the present value of the securities' expected future cash flows, which evidenced deterioration in the performance of individual securities in the portfolio. In December 2010, we undertook a repositioning of our investment securities portfolio by selling approximately $11 billion of securities, composed of $4.3 billion of asset-backed securities, $4.1 billion of non-agency mortgage-backed securities and $2.5 billion of mortgage-backed securities. The repositioning was undertaken to enhance our regulatory capital ratios under evolving regulatory capital standards, increase our balance sheet flexibility in deploying our capital, and reduce our exposure to certain asset classes. The sale resulted in a pre-tax net loss of approximately $344 million, which was recorded in our consolidated statement of income and is reflected in the gross realized gains and gross realized losses presented in the preceding table. The sale included approximately $4.8 billion of securities classified as held to maturity in our consolidated statement of condition. These securities were sold at a net pre-tax loss of $119 million in response to changes in regulatory capital requirements and previous downgrades of the securities.

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Loans And Leases	12 Months Ended
Dec. 31, 2011
Loans And Leases [Abstract]
Loans And Leases	Note 4. Loans and Leases The following table presents our recorded investment in loans and leases, by segment and class, as of December 31:   (In millions)    2011     2010   Institutional:      Investment funds:      U.S.    $ 5,592      $ 5,316    Non-U.S.      796        1,478    Commercial and financial:      U.S.      563        540    Non-U.S.      453        190    Purchased receivables:      U.S.      563        728    Non-U.S.      372        1,471    Lease financing:      U.S.      397        417    Non-U.S.      857        1,053               Total institutional      9,593        11,193    Commercial real estate:      U.S.      460        764    Total loans and leases      10,053        11,957    Allowance for loan losses      (22 )      (100 )  Loans and leases, net of allowance for loan losses    $ 10,031      $ 11,857               The components of our net investment in leveraged lease financing, included in the institutional segment in the preceding table, were as follows as of December 31:   (In millions)    2011     2010   Net rental income receivable    $ 1,671      $ 2,187    Estimated residual values      110        118    Unearned income      (527 )      (835 )                   Investment in leveraged lease financing      1,254        1,470    Less related deferred income tax liabilities      (397 )      (463 )                   Net investment in leveraged lease financing    $ 857      $ 1,007                     We segregate our loans and leases into two segments: institutional and commercial real estate, or CRE. Within these two segments, we further segregate the receivables into classes based on their risk characteristics, their initial measurement attributes and the methods we use to monitor and assess credit risk. The institutional segment is composed of the following classes: investment funds, commercial and financial, purchased receivables and lease financing. Investment funds includes lending to mutual and other collective investment funds and short- duration advances to fund clients in order to provide liquidity in support of their transaction flows associated with securities settlement activities. Commercial and financial includes lending to corporate borrowers, including broker/dealers. Purchased receivables represents undivided interests in securitized pools of underlying third-party receivables. Lease financing includes our investment in leveraged lease financing. Aggregate short-duration advances to our clients included in the institutional segment were $2.17 billion and $2.63 billion at December 31, 2011 and 2010, respectively.   The CRE segment represents the commercial real estate loans acquired in 2008 pursuant to indemnified repurchase agreements with an affiliate of Lehman as a result of the Lehman Brothers bankruptcy. These loans, which are primarily collateralized by direct and indirect interests in commercial real estate, were recorded at their then-current fair value, based on management's expectations with respect to future cash flows from the loans using appropriate market discount rates as of the date of acquisition. These cash flow estimates are updated quarterly to reflect changes in management's expectations, which consider market conditions and other factors. The CRE segment is composed of the following classes: property development; other—acquired credit-impaired; and other. The following tables present our recorded investment in each class of loans and leases by credit quality indicator as of the dates indicated:        Institutional      Commercial Real Estate          December 31, 2011 (In millions)    Investment Funds      Commercial and Financial      Purchased Receivables      Lease Financing      Property Development      Other Acquired Credit- Impaired      Other      Total Loans and Leases   Investment grade    $ 6,341       $ 592       $ 935       $ 1,194       $ 1       $ 3       $ 36       $ 9,102    Speculative      47         424         —           60         379         31         5         946    Doubtful      —           —           —           —           —           5         —           5                                                                            Total    $ 6,388       $ 1,016       $ 935       $ 1,254       $ 380       $ 39       $ 41       $ 10,053                                                                                   Institutional             Commercial Real Estate                 December 31, 2010 (In millions)    Investment Funds      Commercial and Financial      Purchased Receivables      Lease Financing      Property Development      Property Development Acquired- Credit Impaired      Other Acquired Credit- Impaired      Other      Total Loans and Leases   Investment grade    $ 6,674       $ 579       $ 2,199       $ 1,279       $ 3          $ 3       $ 49       $ 10,786    Speculative      120         101         —           191         362            47         108         929    Substandard      —           50         —           —           —              —           —           50    Doubtful      —           —           —           —           86       $ 42         49         15         192    Total    $ 6,794       $ 730       $ 2,199       $ 1,470       $ 451       $ 42       $ 99       $ 172       $ 11,957                                                                                     Loans and leases are grouped in the tables presented above into the rating categories that align with our internal risk- rating framework. Management considers the ratings to be current as of December 31, 2011. We use an internal risk-rating system to assess the risk of credit loss for each loan or lease. This risk-rating process incorporates the use of risk-rating tools in conjunction with management judgment. Qualitative and quantitative inputs are captured in a systematic manner, and following a formal review and approval process, an internal credit rating based on our credit scale is assigned. In assessing the risk rating assigned to each individual loan or lease, among the factors considered are the borrower's debt capacity, collateral coverage, payment history and delinquency experience, financial flexibility and earnings strength, the expected amounts and sources of repayment, the level and nature of contingencies, if any, and the industry and geography in which the borrower operates. These factors are based on an evaluation of historical and current information, and involve subjective assessment and interpretation. Credit counterparties are evaluated and risk-rated on an individual basis at least annually.   The following table presents our recorded investment in loans and leases and the related allowance for loan losses, disaggregated based on our impairment methodology, as of December 31:        Institutional      Commercial Real Estate      Total Loans and Leases   (In millions)    2011      2010      2011      2010      2011      2010   Loans and leases:                   Individually evaluated for impairment    $ 56       $ 112       $ 421       $ 623       $ 477       $ 735    Collectively evaluated for impairment      9,537         11,081         —           —           9,537         11,081    Loans acquired with deteriorated credit quality      —           —           39         141         39         141                                                          Total loans and leases    $ 9,593       $ 11,193       $ 460       $ 764       $ 10,053       $ 11,957                                                          Allowance for loan losses:                   Individually evaluated for impairment             $ 24          $ 24    Collectively evaluated for impairment    $ 22       $ 31            —         $ 22         31    Loans acquired with deteriorated credit quality      —           —              45         —           45    Total allowance for loan losses    $ 22       $ 31         —         $ 69       $ 22       $ 100                                                          The following table presents our recorded investment in impaired loans and leases as of the dates or for the periods indicated:   December 31, 2011     Year Ended December 31, 2011     December 31, 2010   (In millions)   Recorded Investment     Unpaid Principal Balance     Related Allowance(1)     Average Recorded Investment     Interest Revenue Recognized     Recorded Investment     Unpaid Principal Balance     Related Allowance(1)   With no related allowance recorded:                 CRE - property development   $ 199      $ 227        $ 200      $ 15      $ 209      $ 240      CRE - property development – acquired credit-impaired     —          34          —          —            34      CRE - other - acquired credit-impaired     8        69          12        —          16        47      CRE - other     —          —            —          —          27        29      With an allowance recorded:                 CRE - property development     —          —            —          —          79        113      $ 24    CRE - property development – acquired credit-impaired     —          —            —          —          42        47        19    CRE - other - acquired credit-impaired     31        37        —          31        1        83        100        26    CRE - other     —          —          —          —          —          7        9        —                                                                      Total CRE   $ 238      $ 367        —        $ 243      $ 16      $ 463      $ 619      $ 69                                                                    (1) As of December 31, 2011 and December 31, 2010, we maintained allowances for loan losses of $22 million and $31 million, respectively, associated with loans and leases that were not impaired. As of December 31, 2011, we held an aggregate of approximately $199 million of CRE loans which were modified in troubled debt restructurings compared to $307 million as of December 31, 2010. No impairment loss was recognized upon restructuring of the loans, as the discounted cash flows of the modified loans exceeded the carrying amount of the original loans as of the modification date. No loans were modified in troubled debt restructurings in 2011. No institutional loans or leases were 90 days or more contractually past due as of December 31, 2011 or 2010. Although a portion of the CRE loans was 90 days or more contractually past-due as of December 31, 2011 and 2010, we do not report them as past-due loans, pursuant to GAAP that governs the accounting for acquired credit-impaired loans. We generally place loans on non-accrual status once principal or interest payments are 60-days contractually past due, or earlier if management determines that full collection is not probable. Loans 60-days past due, but considered both well-secured and in the process of collection, may be excluded from non-accrual status. For loans placed on non-accrual status, revenue recognition is suspended.   The following table presents the components of our recorded investment in loans and leases on non-accrual status as of December 31:   (In millions)    2011      2010   Commercial Real Estate:       Property development       $ 79    Property development - acquired credit-impaired         42    Other - acquired credit-impaired    $ 5         22    Other      —           15    Total    $ 5       $ 158                The loans presented in the table above were placed on non-accrual status by management because the yield associated with those loans was deemed to be non-accretable, based on the expected future collection of principal and interest from the loans. The property development loan of $79 million presented in the table was transferred to other real estate owned in 2011 subsequent to our execution of a deed-in-lieu-of-foreclosure agreement, net of a partial charge-off. The acquired credit-impaired property development loan of $42 million presented in the table was foreclosed upon and transferred to other real estate owned in 2011, net of a partial charge-off. Neither transfer had an impact on our 2011 consolidated statement of income. The following table presents activity in the allowance for loan losses for the years ended December 31: (In millions)    2011     2010     2009        Institutional     Commercial Real  Estate     Total Loans and Leases     Total Loans and Leases     Total Loans and Leases   Allowance for loan losses:            Beginning balance    $ 31      $ 69      $ 100      $ 79      $ 18    Charge-offs      —          (78 )      (78 )      (4 )      (91 )  Provisions      (9 )      9        —          25        149    Recoveries      —          —          —          —          3                                             Ending balance    $ 22      $ —        $ 22      $ 100      $ 79                                             The charge-offs recorded in 2011 were mainly related to the previously described deed-in-lieu-of-foreclosure agreement and acquired credit-impaired CRE loan foreclosure, as well as an acquired credit-impaired CRE loan whose underlying collateral had deteriorated in value.   Loans and leases are reviewed on a regular basis, and any provisions for loan losses that are recorded reflect management's estimate of the amount necessary to maintain the allowance for loan losses at a level considered appropriate to absorb estimated probable credit losses inherent in the loan and lease portfolio. With respect to CRE loans, management also considers its expectations with respect to future cash flows from those loans and the value of available collateral. These expectations are based, among other things, on an assessment of economic conditions, including conditions in the commercial real estate market and other factors.

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Goodwill And Other Intangible Assets	12 Months Ended
Dec. 31, 2011
Goodwill And Other Intangible Assets [Abstract]
Goodwill And Other Intangible Assets	Note 5.    Goodwill and Other Intangible Assets The following table presents changes in the carrying amount of goodwill during the years ended December 31:      2011     2010   (In millions)    Investment Servicing     Investment Management     Total     Investment Servicing      Investment Management      Total   Beginning balance    $ 5,591      $ 6      $ 5,597      $ 4,544       $ 6       $ 4,550    Acquisitions      68        32        100        1,005         —           1,005    Foreign currency translation, net      (49 )      (3 )      (52 )      42         —           42                                                       Ending balance    $ 5,610      $ 35      $ 5,645      $ 5,591       $ 6       $ 5,597                                                       The following table presents changes in the net carrying amount of other intangible assets during the years ended December 31:        2011     2010   (In millions)    Investment Servicing     Investment Management     Total     Investment Servicing     Investment Management     Total   Beginning balance    $ 2,559      $ 34      $ 2,593      $ 1,760      $ 50      $ 1,810    Acquisitions      67        29        96        969        —          969    Amortization      (189 )      (11 )      (200 )      (170 )      (9 )      (179 )  Foreign currency translation, net      (29 )      (1 )      (30 )      (6 )      (1 )      (7 )  Other      —          —          —          6        (6 )      —                                                       Ending balance    $ 2,408      $ 51      $ 2,459      $ 2,559      $ 34      $ 2,593                                                     The following table presents the gross carrying amount, accumulated amortization and net carrying amount of other intangible assets as of December 31:        2011      2010   (In millions)    Gross Carrying Amount      Accumulated Amortization     Net Carrying Amount      Gross Carrying Amount      Accumulated Amortization     Net Carrying Amount   Customer relationships    $ 2,369       $ (641 )    $ 1,728       $ 2,341       $ (520 )    $ 1,821    Core deposits      702         (117 )      585         710         (83 )      627    Other      233         (87 )      146         220         (75 )      145                                                        Total    $ 3,304       $ (845 )    $ 2,459       $ 3,271       $ (678 )    $ 2,593                                                        Amortization expense related to other intangible assets was $200 million, $179 million and $136 million for the years ended December 31, 2011, 2010 and 2009, respectively. Expected amortization expense for other intangible assets recorded as of December 31, 2011 is $214 million for 2012, $212 million for 2013, $205 million for 2014, $190 million for 2015 and $178 million for 2016.

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Other Assets	12 Months Ended
Dec. 31, 2011
Other Assets [Abstract]
Other Assets	Note 6.    Other Assets The following table presents the components of other assets as of December 31:   (In millions)    2011      2010   Collateral deposits    $ 6,688       $ 3,251    Unrealized gains on derivative financial instruments      6,366         5,255    Investments in joint ventures and other unconsolidated entities      1,060         927    Income taxes receivable      989         530    Accounts receivable      431         290    Deferred tax assets, net of valuation allowance(1)      395         1,786    Prepaid expenses      308         382    Receivable for securities sold      —         122    Other(2)      902         1,298                      Total    $ 17,139       $ 13,841                      (1) Deferred tax assets as of December 31, 2011 are net of deferred tax liabilities within the same tax jurisdiction.   (2) Amount for 2011 included other real estate owned of approximately $75 million.

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Deposits	12 Months Ended
Dec. 31, 2011
Deposits [Abstract]
Deposits	Note 7. Deposits At December 31, 2011 and 2010, we had $8.90 billion and $9.03 billion, respectively, of time deposits outstanding. Non- U.S. time deposits were $2.56 billion and $2.21 billion at December 31, 2011 and 2010, respectively. Substantially all U.S. and non-U.S. time deposits were in amounts of $100,000 or more. The following table presents the scheduled maturities of aggregate U.S. and non-U.S. time deposits at December 31, 2011:   (In millions)        2012    $ 8,862    2013      —      2014      —      2015      —      2016      40             Total    $ 8,902             The following table presents the scheduled maturities of U.S. time deposits at December 31, 2011:   (In millions)        3 months or less    $ 6,141    4 months to a year      161    Over a year      40    Total    $ 6,342

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Short-Term Borrowings	12 Months Ended
Dec. 31, 2011
Short-Term Borrowings [Abstract]
Short-Term Borrowings	Note 8.    Short-Term Borrowings Our short-term borrowings include securities sold under repurchase agreements, federal funds purchased and other short- term borrowings, including borrowings associated with our tax-exempt investment program, more fully described in note 11, and commercial paper issued under our corporate program. Collectively, short-term borrowings had weighted-average interest rates of 0.64% and 1.10% for the years ended December 31, 2011 and 2010, respectively.   The following tables present information with respect to the amounts outstanding and weighted-average interest rates of the primary components of short-term borrowings as of and for the years ended December 31:      Securities Sold Under Repurchase Agreements     Federal Funds Purchased   (Dollars in millions)    2011     2010     2009     2011     2010     2009   Balance at December 31    $ 8,572      $ 7,599      $ 10,542      $ 656      $ 7,748      $ 4,532    Maximum outstanding at any month-end      9,853        9,058        12,993        8,259        7,748        7,166    Average outstanding during the year      9,040        8,108        11,065        845        1,759        956    Weighted-average interest rate at year-end      .04 %      .04 %      .03 %      .05 %      .01 %      .01 %  Weighted-average interest rate during the year      .11        .05        .03        .05        .05        .04           Tax-Exempt Investment Program     Corporate Commercial Paper Program   (Dollars in millions)    2011     2010     2009     2011     2010     2009   Balance at December 31    $ 2,294      $ 2,484      $ 2,736      $ 2,384      $ 2,799      $ 2,777    Maximum outstanding at any month-end      2,473        2,690        2,838        2,825        2,831        2,851    Average outstanding during the year      2,404        2,594        2,774        2,449        2,791        1,993    Weighted-average interest rate at year-end      .18 %      .37 %      .33 %      .22 %      .31 %      .21 %  Weighted-average interest rate during the year      .26        .33        .47        .23        .31        .30         Conduit Commercial Paper  Program   (Dollars in millions)    2011     2010     2009 (1)   Balance at December 31      $ 1,919      $ 12,071    Maximum outstanding at any month-end    $ 271        7,275        15,645    Average outstanding during the year      113        6,339        10,691    Weighted-average interest rate at year-end      —          .57 %      1.31 %  Weighted-average interest rate during the year      .47 %      .32        1.26    (1) Amounts other than balance and weighted-average interest rate at year-end related to the period subsequent to the May 2009 conduit consolidation. The following table presents the components of securities sold under repurchase agreements by underlying collateral as of December 31, 2011:   (In millions)        Collateralized by securities purchased under resale agreements    $ 5,651    Collateralized by investment securities      2,921             Total    $ 8,572             The obligations to repurchase securities sold are recorded as a liability in our consolidated statement of condition. U.S. government securities with a fair value of $2.98 billion underlying the repurchase agreements remained in investment securities at December 31, 2011. The following table presents information about these U.S. government securities and the related repurchase agreements, including accrued interest, as of December 31, 2011. The table excludes repurchase agreements collateralized by securities purchased under resale agreements.        U.S. Government Securities Sold      Repurchase Agreements   (Dollars in millions)    Amortized Cost      Fair Value      Amortized Cost      Rate   Overnight maturity    $ 2,931       $ 2,978       $ 2,921         .001 %    We have entered into an agreement with a clearing organization that enables us to net all securities purchased under resale agreements and sold under repurchase agreements with counterparties that are also members of this organization. As a result of this netting, the average balances of securities purchased under resale agreements and securities sold under repurchase agreements were each reduced by $20.97 billion for 2011 and by $16.27 billion for 2010. We maintain a corporate commercial paper program, under which we can issue up to $3 billion of commercial paper with original maturities of up to 270 days from the date of issue. At December 31, 2011 and 2010, $2.38 billion and $2.80 billion, respectively, of commercial paper was outstanding under our corporate program. State Street Bank had initial Board authority to issue bank notes up to an aggregate of $5 billion, including up to $1 billion of subordinated bank notes. Approximately $2.05 billion was available under this Board authority as of December 31, 2011. At December 31, 2010, $2.45 billion of senior notes was outstanding (refer to note 9), all of which matured during 2011. State Street Bank currently maintains a line of credit of CAD $800 million, or approximately $787 million as of December 31, 2011, to support its Canadian securities processing operations. The line of credit has no stated termination date and is cancelable by either party with prior notice. At December 31, 2011, no balance was outstanding on this line of credit.

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Long-Term Debt	12 Months Ended
Dec. 31, 2011
Long-Term Debt [Abstract]
Long-Term Debt	Note 9. Long-Term Debt   (Dollars in millions)    2011      2010   Statutory business trusts:       Floating-rate subordinated notes due to State Street Capital Trust IV in 2037    $ 800       $ 800    Floating-rate subordinated notes due to State Street Capital Trust I in 2028      155         155    Subordinated notes due to State Street Capital Trust III in 2042      —           500    Parent company and non-banking subsidiary issuances:       2.15% notes due 2012(1)      1,500         1,499    2.875% notes due 2016(2)      999         —      4.375% notes due 2021(2)      757         —      Long-term capital leases      694         716    4.956% junior subordinated debentures due 2018(2)      542         —      4.30% notes due 2014      512         500    5.375% notes due 2017      450         450    Floating-rate notes due 2012      250         268    Floating-rate notes due 2014      250         —      7.35% notes due 2026      150         150    State Street Bank issuances:       5.25% subordinated notes due 2018(2)      453         439    5.30% subordinated notes due 2016      419         423    Floating-rate subordinated notes due 2015      200         200    Floating-rate notes due 2011(1)      —           1,450    1.85% notes due 2011(1)      —           1,000                      Total long-term debt    $ 8,131       $ 8,550                      (1)  Notes are guaranteed by the FDIC under its Temporary Liquidity Guarantee Program, or TLGP. (2)  We have entered into interest-rate swap agreements, recorded as fair value hedges, to modify our interest expense on these subordinated notes from a fixed rate to a floating rate. As of December 31, 2011 and 2010, we recorded an increase of $140 million and $81 million, respectively, in the carrying value of long-term debt associated with fair value hedges. Refer to note 16 for additional information about derivatives. We maintain an effective universal shelf registration that allows for the offering and sale of debt securities, capital securities, common stock, depositary shares and preferred stock, and warrants to purchase such securities, including any shares into which the preferred stock and depositary shares may be convertible, or any combination thereof. Statutory Business Trusts: As of December 31, 2011, we had two statutory business trusts, State Street Capital Trusts I and IV, which as of December 31, 2011, collectively had issued $955 billion of trust preferred capital securities. Proceeds received by each of the trusts from their capitalization and from their capital securities issuances are invested in junior subordinated debentures issued by the parent company. The junior subordinated debentures are the sole assets of Capital Trusts I and IV. Each of the trusts is wholly-owned by us; however, we do not record the trusts in our consolidated financial statements in accordance with GAAP.   Payments made by the trusts to holders of the capital securities are dependent on our payments made to the trusts on the junior subordinated debentures. Our fulfillment of these commitments has the effect of providing a full, irrevocable and unconditional guarantee of the trusts' obligations under the capital securities. While the capital securities issued by the trusts are not recorded in our consolidated statement of condition, the junior subordinated debentures qualify for inclusion in tier 1 regulatory capital under federal regulatory capital guidelines. Information about restrictions on our ability to obtain funds from our subsidiary banks is provided in note 15. Interest paid on the debentures by the parent company is recorded in interest expense. Distributions to holders of the capital securities by the trusts are payable from interest payments received on the debentures and are due quarterly by State Street Capital Trusts I and IV, subject to deferral for up to five years under certain conditions. The capital securities are subject to mandatory redemption in whole at the stated maturity upon repayment of the debentures, with an option by us to redeem the debentures at any time upon the occurrence of certain tax events or changes to tax treatment, investment company regulation or capital treatment; or at any time after May 15, 2008 for the Capital Trust I securities and any time after June 15, 2012 for the Capital Trust IV securities. Redemptions are subject to federal regulatory approval. Parent Company and Non-Banking Subsidiary Issuances: The $1.5 billion of 2.15% notes mature on April 30, 2012, with interest payable semi-annually in arrears on April 30 and October 30 of each year. We have the option to redeem the notes prior to their maturity if we become obligated to pay certain additional amounts because of changes in the laws or regulations of any U.S. taxing authority. These senior notes are guaranteed by the FDIC under its TLGP. If we fail to make a timely payment of any principal or interest, the FDIC is obligated to make such payment following required notification. The FDIC's guarantee of the notes will expire upon their redemption or on April 30, 2012. In 2011, we issued an aggregate of $2 billion of senior notes, composed of $1 billion of 2.875% notes due March 7, 2016, $750 million of 4.375% notes due March 7, 2021 and $250 million of floating-rate notes due March 7, 2014. Interest on the 2.875% notes and the 4.375% notes is payable semi-annually in arrears on March 7 and September 7 of each year, beginning on September 7, 2011. Interest on the floating-rate notes is payable quarterly in arrears on March 7, June 7, September 7 and December 7 of each year, beginning on June 7, 2011. At December 31, 2011 and 2010, long-term capital leases included $422 million and $431 million, respectively, related to our One Lincoln Street headquarters building and the One Lincoln Street parking garage, with the remaining $272 million and $279 million, respectively, substantially related to an office building in the U.K. Refer to note 19 for additional information.   In 2011, we issued approximately $500 million of 4.956% junior subordinated debentures due March 15, 2018, in a remarketing of the 6.001% junior subordinated debentures due 2042 originally issued to State Street Capital Trust III in 2008. The original debentures were issued to Capital Trust III in connection with our concurrent offering of the trust's 8.25% fixed- to-floating rate normal automatic preferred enhanced capital securities, referred to as normal APEX. The net proceeds from the sale of the remarketed 4.956% junior subordinated debentures were ultimately used by Capital Trust III to make a final distribution to the holders of the normal APEX with respect to the original 6.001% junior subordinated debentures and to satisfy the obligation of Capital Trust III to purchase $500 million of our non-cumulative perpetual preferred stock, series A, $100,000 liquidation preference per share (refer to note 12). The preferred stock constitutes the principal asset of the trust. As a result of the above-described transactions, as of December 31, 2011 we had outstanding the above-referenced $500 million of 4.956% junior subordinated debentures due March 15, 2018 and $500 million of non-cumulative perpetual preferred stock. The 4.956% debentures qualify for inclusion in tier 2 regulatory capital and the perpetual preferred stock qualifies for inclusion in tier 1 regulatory capital, both under federal regulatory capital guidelines. The original 6.001% junior subordinated debentures, which qualified for inclusion in tier 1 regulatory capital as trust preferred securities, were canceled as a result of the remarketing transaction. Interest on the 4.956% junior subordinated debentures is payable semi-annually in arrears on March 15 and September 15 of each year, beginning on March 15, 2011. The debentures mature on March 15, 2018, and we do not have the right to redeem the debentures prior to maturity other than upon the occurrence of specified events. Redemption of the debentures is subject to federal regulatory approval. The $500 million of 4.30% notes mature on May 30, 2014, with interest payable semi-annually in arrears on May 30 and November 30 of each year. We cannot redeem the notes prior to maturity. We completed the issuance primarily in connection with our intention to redeem the U.S. Treasury's preferred equity investment received in October 2008 under the TARP Capital Purchase Program. The $450 million of 5.375% notes mature on April 30, 2017, with interest payable semi-annually in arrears on April 30 and October 30 of each year. The $250 million of floating-rate notes mature on April 30, 2012, with interest payable quarterly in arrears at the three-month LIBOR rate plus 10 basis points on January 30, April 30, July 30, and October 30 of each year. We may not redeem the notes prior to their maturity. The $150 million of 7.35% notes mature on June 15, 2026, with interest payable semi-annually on June 15 and December 15 of each year. We may not redeem the notes prior to their maturity. State Street Bank Issuances: With respect to the 5.25% subordinated bank notes due 2018, State Street Bank is required to make semi-annual interest payments on the outstanding principal balance of the notes on April 15 and October 15 of each year, and the notes qualify for inclusion in tier 2 regulatory capital under federal regulatory capital guidelines. With respect to the 5.30% subordinated notes due 2016 and the floating-rate subordinated notes due 2015, State Street Bank is required to make semi-annual interest payments on the outstanding principal balance of the 5.30% notes on January 15 and July 15 of each year, and quarterly interest payments on the outstanding principal balance of the floating-rate notes on March 8, June 8, September 8 and December 8 of each year. Each of the subordinated notes qualifies for inclusion in tier 2 regulatory capital under federal regulatory capital guidelines.

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Commitments And Contingencies	12 Months Ended
Dec. 31, 2011
Commitments And Contingencies [Abstract]
Commitments And Contingencies	Note 10. Commitments and Contingencies Credit-Related Commitments and Contingencies: Credit-related financial instruments, which are off-balance sheet, include indemnified securities financing, unfunded commitments to extend credit or purchase assets, and standby letters of credit. The potential loss associated with indemnified securities financing, unfunded commitments and standby letters of credit is equal to the total gross contractual amount, which does not consider the value of any collateral. The following table summarizes the total gross contractual amounts of credit-related off-balance sheet financial instruments at December 31. Amounts reported do not reflect participations to independent third parties.   (In millions)    2011      2010   Indemnified securities financing(1)    $ 302,342       $ 334,235    Unfunded commitments to extend credit      17,297         14,772    Asset purchase agreements      5,056         4,866    Standby letters of credit      3,938         4,174    (1)  Related collateral and other information is provided in the following "Securities Finance" section. Approximately 77% of the unfunded commitments to extend credit expire within one year from the date of issue. Since many of these commitments are expected to expire or renew without being drawn upon, the total commitment amount does not necessarily represent future cash requirements. Securities Finance: On behalf of our clients, we lend their securities, as agent, to brokers and other institutions. In most circumstances, we indemnify our clients for the fair market value of those securities against a failure of the borrower to return such securities. We require the borrowers to maintain collateral in an amount equal to or in excess of 100% of the fair market value of the securities borrowed. Securities on loan are revalued daily to determine if additional collateral is necessary. Collateral received in connection with our securities lending services is held by us as agent and is not recorded in our consolidated statement of condition. The collateral held by us as agent is invested on behalf of our clients. In certain cases, the collateral is invested in third-party repurchase agreements, for which we indemnify the client against loss of the principal invested. We require the counterparty to the indemnified repurchase agreement to provide collateral in an amount equal to or in excess of 100% of the amount of the repurchase obligation. In our role as agent, the indemnified repurchase agreements and the related collateral held by us are not recorded in our consolidated statement of condition. The following table summarizes the fair values of indemnified securities financing and related collateral, as well as collateral invested in indemnified repurchase agreements, at December 31:   (In millions)    2011      2010   Aggregate fair value of indemnified securities financing    $ 302,342       $ 334,235    Aggregate fair value of cash and securities held as collateral for indemnified securities financing      312,598         343,410    Aggregate fair value of collateral for indemnified securities financing invested in indemnified repurchase agreements      88,656         89,069    Aggregate fair value of cash and securities held by us or our agents as collateral for indemnified repurchase agreements      93,039         93,294    In certain cases, we participate in securities lending transactions as principal, rather than as agent. As principal, we borrow securities from the lending client and then lend such securities to the subsequent borrower, either a State Street client or a broker/dealer. Collateral provided and received associated with such transactions is recorded in other assets and accrued expenses and other liabilities, respectively, in our consolidated statement of condition. At December 31, 2011 and 2010, we had approximately $5.21 billion and $2.72 billion, respectively, of collateral provided and approximately $4.59 billion and $1.21 billion, respectively, of collateral received in connection with principal securities lending transactions. Legal Proceedings: In the ordinary course of business, we and our subsidiaries are involved in disputes, litigation and regulatory inquiries and investigations, both pending and threatened. These matters, if resolved adversely against us, may result in monetary damages, fines and penalties or require changes in our business practices. The resolution of these proceedings is inherently difficult to predict. However, we do not believe that the amount of any judgment, settlement or other action arising from any pending proceeding will have a material adverse effect on our consolidated financial condition or cash flows, although the outcome of certain of the matters described below may have a material adverse effect on our consolidated results of operations for the period in which such matter is resolved or a reserve is determined to be required. To the extent that we have established reserves in our consolidated statement of condition for probable loss contingencies, such reserves may not be sufficient to cover our ultimate financial exposure associated with any settlements or judgments. We may be subject to proceedings in the future that, if adversely resolved, would have a material adverse effect on our businesses or on our future consolidated results of operations or financial condition. Except where otherwise noted below, we have not recorded a reserve with respect to the claims discussed and do not believe that potential exposure, if any, as to any matter discussed can be reasonably estimated. SSgA The SEC has requested information regarding registered mutual funds managed by SSgA that invested in sub-prime securities. As of June 30, 2007, these funds had net assets of less than $300 million, and the net asset value per share of the funds experienced an average decline of approximately 7.23% during the third quarter of 2007. Average returns for industry peer funds were positive during the same period. During the course of our responding to such inquiry, certain potential compliance issues have been identified and are in the process of being resolved with the SEC staff. These funds were not covered by our regulatory settlement, announced in the first quarter of 2010, with the SEC, the Massachusetts Attorney General and the Massachusetts Securities Division of the Office of the Secretary of State, which concerned certain unregistered SSgA-managed funds that pursued active fixed-income strategies. Four lawsuits by individual investors in those active fixed- income strategies remain pending. The U.S. Attorney's office in Boston and the Financial Industry Regulatory Authority have also requested information in connection with our active-fixed income strategies. One of the four lawsuits by investors was filed by Prudential Retirement Insurance and Annuity Co. in 2007 in New York federal court. Prudential sought damages in excess of the compensation it received from the fair fund established by State Street in the first quarter of 2010 in connection with the regulatory settlement noted above. Prudential is also seeking related costs, including pre-judgment interest and attorneys' fees. On February 3, 2012, the Court issued a ruling finding that Prudential is entitled to a payment from State Street, after adjustment for the compensation received from the fair fund, in the amount of $28.1 million. This award may ultimately be increased if the Court awards Prudential interest and costs. We intend to appeal the Court's February 3, 2012 ruling. The timing of the remaining phases of further trial proceedings or of any appeal can not currently be determined. Two of the other three lawsuits by individual investors are in federal court in Texas, with one scheduled for trial in March 2012, and the other is in federal court in New York. The plaintiffs in these lawsuits also seek to recover amounts in excess of their compensation from the fair fund established by the 2010 settlement, along with pre- judgment interest, attorneys' fees and punitive damages. We estimate that our exposure in the Prudential and three other lawsuits may be, in the aggregate, in a range from $0 to approximately $90 million. This estimated exposure range includes estimated pre-judgment interest and attorneys' fees, if awarded. The estimated exposure range does not include any potential awards of claimed punitive damages, which cannot reasonably be estimated. The actual amount, if any, of our ultimate aggregate liability in the Prudential and three other lawsuits may be more or less than the top of the estimated range. We have not established a reserve with respect to these matters. We are currently defending a putative ERISA class action by investors in unregistered SSgA-managed funds which challenges the division of our securities lending-related revenue between the SSgA lending funds and State Street in its role as lending agent. The action alleges, among other things, that State Street breached its fiduciary duty to investors in the SSgA lending funds. The plaintiff contends that State Street's agency lending clients received more favorable fee splits than did clients of the SSgA lending funds.   As previously reported, we managed, through SSgA, four common trust funds for which, in our capacity as manager and trustee, we appointed various Lehman entities as prime broker. As of September 15, 2008 (the date two of the Lehman entities involved entered insolvency proceedings), these funds had cash and securities held by Lehman with net asset values of approximately $312 million. Some clients who invested in the funds managed by us brought litigation against us seeking compensation and additional damages, including double or treble damages, for their alleged losses in connection with our prime brokerage arrangements with Lehman's entities. A total of seven clients were invested in such funds, of which three currently have suits pending against us. Two cases are pending in federal court in Boston and the third is pending in Nova Scotia. We have entered into settlements with three clients, one of which was entered into after the client obtained a €42 million judgment from a Dutch court. As of September 15, 2008, the four clients with whom we have not entered into settlement agreements had approximately $143 million invested in the funds at issue. We have not established a reserve with respect to any of the unsettled claims. Securities Finance Two related participants in our agency securities lending program have brought suit against us challenging actions taken by us in response to their withdrawal from the program. We believe that certain withdrawals by these participants were inconsistent with the redemption policy applicable to the agency lending collateral pools and, consequently, redeemed their remaining interests through an in-kind distribution that reflected the assets these participants would have received had they acted in accordance with the collateral pools' redemption policy. The participants have asserted damages of $120 million, an amount that plaintiffs have stated was the difference between the amortized cost and market value of the assets that State Street proposed to distribute to the plans in-kind in or about August 2009. While management does not believe that such difference is an appropriate measure of damages, as of September 30, 2010, the last date on which State Street acted as custodian for the participants, the difference between the amortized cost and market value of the in-kind distribution was approximately $49 million, and if such securities were still held by the participants on such date, would have been approximately $28.5 million as of December 31, 2011. In taking these actions, we believe that we acted in the best interests of all participants in the collateral pools. We have not established a reserve with respect to this litigation. Foreign Exchange We offer our custody clients and their investment managers the option to route foreign exchange transactions to our foreign exchange desk through our asset servicing operation. We record as revenue an amount approximately equal to the difference between the rates we set for those trades and indicative interbank market rates at the time of execution of the trade. As discussed more fully below, claims have been asserted on behalf of certain current and former custody clients, and future claims may be asserted, alleging that our indirect foreign exchange rates (including the differences between those rates and indicative interbank market rates) were not adequately disclosed or were otherwise improper, and seeking to recover, among other things, the full amount of the revenue we earned from our indirect foreign exchange trading with them. In October 2009, the Attorney General of the State of California commenced an action under the California False Claims Act and California Business and Professional Code related to services State Street provides to California state pension plans. The California Attorney General asserts that the pricing of certain foreign exchange transactions for these pension plans was governed by the custody contracts for these plans and that our pricing was not consistent with the terms of those contracts and related disclosures to the plans, and that, as a result, State Street made false claims and engaged in unfair competition. The Attorney General asserted actual damages of $56 million for periods from 2001 to 2009 and seeks additional penalties, including treble damages. This action is in the discovery phase. In October 2010, we entered into a $12 million settlement with the State of Washington. This settlement resolves a contract dispute related to the manner in which we priced some foreign exchange transactions during our ten-year relationship with the State of Washington. Our contractual obligations and related disclosures to the State of Washington were significantly different from those presented in our ongoing litigation in California.   We provide custody and principal foreign exchange services to government pension plans in other jurisdictions. Since the commencement of the litigation in California, attorneys general and other governmental authorities from a number of jurisdictions, as well as U.S. Attorney's offices, the U.S. Department of Labor and the U.S. Securities and Exchange Commission, have requested information or issued subpoenas in connection with inquiries into the pricing of our foreign exchange services. We continue to respond to such inquiries and subpoenas. We offer indirect foreign exchange services such as those we offer to the California pension plans to a broad range of custody clients in the U.S. and internationally. We have responded and are responding to information requests from a number of clients concerning our indirect foreign exchange rates. In February 2011, a putative class action was filed in federal court in Boston seeking unspecified damages, including treble damages, on behalf of all custodial clients that executed certain foreign exchange transactions with State Street from 1998 to 2009. The putative class action alleges, among other things, that the rates at which State Street executed foreign currency trades constituted an unfair and deceptive practice under Massachusetts law and a breach of the duty of loyalty. A second putative class action is currently pending in federal court in Boston alleging various violations of ERISA on behalf of all ERISA plans custodied with us that executed indirect foreign exchange transactions with State Street between 2001 and 2009. The complaint, originally filed in federal court in Baltimore, alleges that State Street caused class members to pay unfair and unreasonable rates for indirect foreign exchange transactions with State Street. The complaint seeks unspecified damages, disgorgement of profits, and other equitable relief. We have not established a reserve with respect to any of the pending legal proceedings relating to our indirect foreign exchange services. There can be no assurance as to the outcome of the pending proceedings in California or Massachusetts, or whether any other proceedings might be commenced against us by clients or government authorities. We expect that plaintiffs will seek to recover their share of all or a portion of the revenue that we have recorded from providing indirect foreign exchange services. Our total revenue worldwide from such services was approximately $331 million for the year ended December 31, 2011, approximately $336 million for the year ended December 31, 2010, approximately $369 million for the year ended December 31, 2009 and approximately $462 million for the year ended December 31, 2008. Although we did not calculate revenue for such services prior to 2006 in the same manner, and have refined our calculation method over time, we believe that the amount of our revenue for such services has been of a similar or lesser order of magnitude for many years. We cannot predict the outcome of any pending proceedings or whether a court, in the event of an adverse resolution, would consider our revenue to be the appropriate measure of damages. The resolution of pending proceedings or any that may be filed or threatened could have a material adverse effect on our future consolidated results of operations and our reputation. Our revenue calculations related to indirect foreign exchange services reflect a judgment concerning the relationship between the rates we charge for indirect foreign exchange execution and indicative interbank market rates near in time to execution. Our revenue from foreign exchange trading generally depends on the difference between the rates we set for indirect trades and indicative interbank market rates on the date trades settle. Shareholder Litigation Three shareholder-related class action complaints are currently pending in federal court in Boston. One complaint purports to be brought on behalf of State Street shareholders. The two other complaints purport to be brought on behalf of participants and beneficiaries in the State Street Salary Savings Program who invested in the program's State Street common stock investment option. The complaints variously allege violations of the federal securities laws and ERISA in connection with our foreign exchange trading business, our investment securities portfolio and our asset-backed commercial paper conduit program.   Lehman Entities We have claims against Lehman entities, referred to as Lehman, in bankruptcy proceedings in the U.S. and the U.K. We also have amounts that we owe, or return obligations, to Lehman. The various claims and amounts owed have arisen from transactions that existed at the time Lehman entered bankruptcy, including foreign exchange transactions, securities lending arrangements and repurchase agreements. During the third quarter of 2011, we reached agreement with certain Lehman bankruptcy estates in the U.S. to resolve the value of deficiency claims arising out of indemnified repurchase transactions in the U.S., and the bankruptcy court has allowed those claims in the amount of $400 million. The amount we ultimately collect will be subject to the availability of assets in those estates. We are in discussions with other Lehman bankruptcy administrators and would expect over time to resolve or obtain greater clarity on the other outstanding claims. We continue to believe that our allowed and/or realizable claims against Lehman exceed our potential return obligations, but the ultimate outcomes of these matters cannot be predicted with certainty. In addition, given the complexity of these matters, it remains likely that the resolution of these matters could occur in different periods, potentially resulting in the recognition of gains or losses in different periods. Investment Servicing State Street Bank is named as a defendant in three complaints filed in federal court in Boston in January 2012 by investment management clients of TAG Virgin Islands, Inc., or TAG, who hold custodial accounts with State Street. The complaints, collectively, allege claims for breach of contract, gross negligence, negligence, negligent misrepresentation, unjust enrichment, breach of fiduciary duty and aiding and/or abetting a breach of fiduciary duty, in connection with certain assets managed by TAG and custodied with State Street. One complaint is an individual action. Two of the complaints are putative class actions asserted on behalf of certain persons or entities who were clients of TAG and entered into a custodial relationship with State Street and/or its predecessors in interest. Collectively, the complaints seek relief including claimed damages in excess of $100 million. Tax Contingencies: In the normal course of our business, we are subject to challenges from U.S. and non-U.S. income tax authorities regarding the amount of taxes due. These challenges may result in adjustments to the timing or amount of taxable income or deductions or the allocation of taxable income among tax jurisdictions. The IRS completed its review of our U.S. income tax returns for the tax years 2000—2006. In 2011, we reached agreement with the IRS to close their review of those tax years, and the adjustments recorded in our consolidated financial statements to reflect our ultimate exposure with respect to the results of the review did not differ materially from the amounts accrued. Other Contingencies: In the normal course of our business, we offer products that provide book-value protection primarily to plan participants in stable value funds managed by non-affiliated investment managers of post-retirement defined contribution benefit plans, particularly 401(k) plans. The book-value protection is provided on portfolios of intermediate, investment grade fixed-income securities, and is intended to provide safety and stable growth of principal invested. The protection is intended to cover any shortfall in the event that a significant number of plan participants withdraw funds when book value exceeds market value and the liquidation of the assets is not sufficient to redeem the participants. The investment parameters of the underlying portfolios, combined with structural protections, are designed to provide cushion and guard against payments even under extreme stress scenarios. As of December 31, 2011 and 2010, the aggregate notional amount of the contingencies associated with these products, which are individually accounted for as derivative financial instruments, totaled $40.96 billion and $46.76 billion, respectively. The notional amounts of these contingencies are presented as "derivatives not designated as hedging instruments" in the table of aggregate notional amounts of derivative financial instruments provided in note 16. As of December 31, 2011, we have not made a payment under these contingencies that we consider material to our consolidated financial condition, and management believes that the probability of payment under these contingencies in the future that we would consider material to our consolidated financial condition is remote.

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Variable Interest Entities	12 Months Ended
Dec. 31, 2011
Variable Interest Entities [Abstract]
Variable Interest Entities	Note 11. Variable Interest Entities  We are involved with various types of variable interest entities, or VIEs, as defined by GAAP, some of which are recorded in our consolidated financial statements and all of which are described below. We also invest in various forms of asset-backed securities, which we carry in our investment securities portfolio. These asset-backed securities meet the GAAP definition of asset securitization entities, which entities are considered to be VIEs. We are not considered to be the primary beneficiary of these VIEs, as defined by GAAP, since we do not have control over their activities. Additional information about our asset-backed securities is provided in note 3. Tax-Exempt Investment Program: In the normal course of our business, we structure and sell certificated interests in pools of tax-exempt investment-grade assets, principally to our mutual fund clients. We structure these pools as partnership trusts, and the assets and liabilities of the trusts are recorded in our consolidated statement of condition as investment securities available for sale and other short-term borrowings. We may also provide liquidity and re-marketing services to the trusts. As of December 31, 2011 and 2010, we carried investment securities available for sale, composed of securities related to state and political subdivisions, with a fair value of $2.81 billion and $2.85 billion, respectively, and other short-term borrowings (refer to note 8) of $2.29 billion and $2.48 billion, respectively, in our consolidated statement of condition in connection with these trusts.  We transfer assets to the trusts from our investment securities portfolio at adjusted book value, and the trusts finance the acquisition of these assets by selling certificated interests issued by the trusts to third-party investors and to State Street as residual holder. These transfers do not meet the de-recognition criteria defined by GAAP, and therefore, are recorded in our consolidated financial statements. The trusts had a weighted-average life of approximately 7.4 years at December 31, 2011, compared to approximately 7.7 years at December 31, 2010. Under separate legal agreements, we provide standby bond-purchase agreements to these trusts and, with respect to certain securities, letters of credit. Our commitments to the trusts under these standby bond-purchase agreements and letters of credit totaled $2.35 billion and $669 million, respectively, at December 31, 2011, none of which was utilized at period-end. In the event that our obligations under these agreements are triggered, no material impact to our consolidated results of operations or financial condition is expected to occur, because the securities are already recorded at fair value in our consolidated statement of condition. Asset-Backed Commercial Paper Program: We previously sponsored and administered multi-seller asset-backed commercial paper programs, or conduits, which are recorded in our consolidated financial statements. As of December 31, 2011 and 2010, we carried assets, composed primarily of asset-backed securities, with an aggregate carrying value of $264 million and $5.01 billion, respectively, and loans, composed of purchased receivables (refer to note 4), of $935 million and $2.20 billion, respectively, in our consolidated statement of condition in connection with the conduits. In addition, as of December 31, 2010, we carried aggregate other short-term borrowings, associated with the conduits was outstanding to third parties as of December 31, 2011. In 2009, we elected to take action that resulted in the consolidation, for financial reporting purposes, of all of the assets and liabilities of the conduits into our consolidated statement of condition, as required by GAAP. We consolidated the conduits only for accounting purposes and did not legally acquire all of their assets and liabilities. Accordingly, we recorded the conduits' aggregate assets and liabilities in our consolidated statement of condition at their estimated fair values on the date of consolidation, and recorded a pre-tax extraordinary loss of approximately $6.10 billion, or approximately $3.68 billion after- tax, in our consolidated statement of income. This loss was primarily related to the difference between the fair value of the conduits' aggregate assets, primarily mortgage- and asset-backed securities, and the conduits' aggregate liabilities, primarily short-term borrowings composed of commercial paper issued by the conduits. The difference between the aggregate fair value of the conduits' investment securities and their par value on the date of consolidation created a discount. To the extent that the projected future cash flows from the securities we continue to hold exceed their recorded carrying amounts, the portion of the discount not related to credit will accrete into interest revenue over the securities' remaining terms. During the years ended December 31, 2011, 2010 and 2009, we recorded accretion of approximately $220 million, $712 million and $621 million, respectively, in interest revenue in our consolidated statement of income. Collateralized Debt Obligations:  We serve as collateral manager for a series of collateralized debt obligations, referred to as CDOs. A CDO is a structured investment vehicle which purchases a portfolio of assets funded through the issuance of several classes of debt and equity, the repayment of and return on which are linked to the performance of the underlying assets. We have determined that we are not the primary beneficiary of these VIEs, and do not record them in our consolidated financial statements. As of December 31, 2011 and 2010, the aggregate notional amount of these CDOs was $400 million and $1.0 billion, respectively. As of December 31, 2011 and 2010, the carrying amount of the underlying collateral was $166 million and $323 million, respectively. We have not acquired or transferred any investment securities to a CDO since 2005.

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Shareholders' Equity	12 Months Ended
Dec. 31, 2011
Shareholders' Equity [Abstract]
Shareholders' Equity	Note 12. Shareholders' Equity In 2011, we issued 5,001 shares, or $500 million, of our non-cumulative perpetual preferred stock, series A, $100,000 liquidation preference per share, in connection with the remarketing of our 6.001% junior subordinated debentures due 2042 originally issued to State Street Capital Trust III in 2008. The preferred stock was purchased by State Street Capital Trust III using the ultimate proceeds from the remarketing transaction, and now constitutes the principal asset of the trust. The preferred stock qualifies for inclusion in tier 1 regulatory capital under federal regulatory capital guidelines. Additional information about the remarketing transaction is provided in note 9. Quarterly dividends on the preferred stock are calculated at an annual rate equal to the relevant three-month LIBOR plus 4.99%, with such dividend rate applied to the outstanding liquidation preference of the preferred stock. Dividends are non-cumulative, and are accrued when declared. In 2011, our Board of Directors approved a new program authorizing the purchase by us of up to $675 million of our common stock in 2011. This new program superseded the Board's prior authorization under which 13.25 million common shares were available for purchase as of December 31, 2010. During the period from April 1, 2011 through December 31, 2011, we purchased approximately 16.3 million shares of our common stock, at an average cost per share of approximately $41.38 and an aggregate cost of approximately $675 million. As of December 31, 2011, no purchase authority remained under this program. No shares of our common stock were purchased by us in 2010 or 2009. We may employ third-party broker/dealers to acquire shares on the open market in connection with our common stock purchase programs. Our common shares may be acquired for other deferred compensation plans, held by an external trustee, that are not part of our common stock purchase program. As of December 31, 2011 and 2010, approximately 406,000 and 420,000 shares, respectively, had been purchased and were held in trust. These shares are recorded as treasury stock in our consolidated statement of condition.   The following table presents the after-tax components of accumulated other comprehensive loss as of December 31:   (In millions)    2011     2010     2009   Foreign currency translation      $ 216      $ 281    Net unrealized loss on hedges of net investments in non-U.S. subsidiaries    $ (14 )      (14 )      (14 )  Net unrealized gain (loss) on available-for-sale securities portfolio      110        (90 )      (1,001 )  Net unrealized loss related to reclassified available-for-sale securities      (189 )      (317 )      (635 )                           Net unrealized loss on available-for-sale securities      (79 )      (407 )      (1,636 )  Net unrealized loss on available-for-sale securities designated in fair value hedges      (210 )      (135 )      (113 )  Expected losses from other-than-temporary impairment on available-for-sale securities related to factors other than credit      (17 )      (17 )      (159 )  Expected losses from other-than-temporary impairment on held-to-maturity securities related to factors other than credit      (86 )      (111 )      (387 )  Net unrealized loss on cash flow hedges      (5 )      (11 )      (18 )  Minimum pension liability      (248 )      (210 )      (192 )                           Total    $ (659 )    $ (689 )    $ (2,238 )                           For the year ended December 31, 2011, we realized net gains of $140 million from sales of available-for-sale securities. Unrealized pre-tax gains of $76 million were included in other comprehensive income, or OCI, at December 31, 2010, net of deferred taxes of $30 million, related to these sales. For the year ended December 31, 2010, we realized net losses of $55 million from sales of investment securities. Unrealized pre-tax losses of $728 million were included in OCI at December 31, 2009, net of deferred taxes of $291 million, related to these sales. For the year ended December 31, 2009, we realized net gains of $368 million from sales of available-for-sale securities. Unrealized pre-tax gains of $46 million were included in OCI at December 31, 2008, net of deferred taxes of $18 million, related to these sales.

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Fair Value	12 Months Ended
Dec. 31, 2011
Fair Value [Abstract]
Fair Value	Note 13.    Fair Value Fair Value Measurements: We carry trading account assets, investment securities available for sale and various types of derivative financial instruments at fair value in our consolidated statement of condition on a recurring basis. Changes in the fair values of these financial assets and liabilities are recorded either as components of our consolidated statement of income or as components of OCI within shareholders' equity in our consolidated statement of condition. We measure fair value for the above-described financial assets and liabilities in accordance with GAAP that governs the measurement of the fair value of financial instruments. Management believes that its valuation techniques and underlying assumptions used to measure fair value conform to the provisions of GAAP. We categorize the financial assets and liabilities that we carry at fair value based on a prescribed three-level valuation hierarchy. The hierarchy gives the highest priority to quoted prices in active markets for identical assets or liabilities (level 1) and the lowest priority to valuation methods using significant unobservable inputs (level 3). If the inputs used to measure a financial asset or liability cross different levels of the hierarchy, categorization is based on the lowest-level input that is most significant to the fair value measurement. Management's assessment of the significance of a particular input to the overall fair value measurement of a financial asset or liability requires judgment, and considers factors specific to that asset or liability. The three valuation levels are described below. Level 1. Financial assets and liabilities with values based on unadjusted quoted prices for identical assets or liabilities in an active market. Fair value is measured using unadjusted quoted prices in active markets for identical securities. Our level 1 financial assets and liabilities primarily include long and short positions in U.S. government securities and highly liquid U.S. and non-U.S. government fixed-income securities. We carry U.S. government securities in our available-for-sale portfolio in connection with our asset and liability management activities. We carry the long and short positions in highly liquid fixed-income securities in trading account assets and accrued expenses and other liabilities in connection with our trading activities. We assume these long and short positions in our role as a financial intermediary, which includes accommodating our clients' investment and risk management needs. Our level 1 financial assets also include active exchange-traded equity securities. Level 2. Financial assets and liabilities with values based on quoted prices for similar assets and liabilities in active markets, and inputs that are observable for the asset or liability, either directly or indirectly, for substantially the full term of the asset or liability. Level 2 inputs include the following:     •   Quoted prices for similar assets or liabilities in active markets;     •   Quoted prices for identical or similar assets or liabilities in non-active markets;     •   Pricing models whose inputs are observable for substantially the full term of the asset or liability; and     •   Pricing models whose inputs are derived principally from, or corroborated by, observable market information through correlation or other means for substantially the full term of the asset or liability. The fair value of the investment securities in level 2 is measured primarily using information obtained from independent third parties. This third-party information is subject to review by management as part of a validation process, which includes obtaining an understanding of the underlying assumptions and the level of market participant information used to support those assumptions. In addition, management compares significant assumptions used by third parties to available market information. Such information may include known trades or, to the extent that trading activity is limited, comparisons to market research information pertaining to credit expectations, execution prices and the timing of cash flows, and where information is available, back-testing. The fair value of the derivative instruments categorized in level 2 predominantly represents foreign exchange contracts used in our trading activities, for which fair value is measured using discounted cash flow techniques, with inputs consisting of observable spot and forward points, as well as observable interest rate curves. With respect to derivative instruments, we evaluated the impact on valuation of the credit risk of our counterparties and our own credit risk. We considered factors such as the likelihood of default by us and our counterparties, our current and potential future net exposures and remaining maturities in determining the appropriate measurements of fair value. Valuation adjustments associated with derivative instruments were not significant for the years ended December 31, 2011, 2010 or 2009. Our level 2 financial assets and liabilities primarily include various types of foreign exchange and interest-rate derivative instruments, as well as trading account assets and fixed-income investment securities. Level 3. Financial assets and liabilities with values based on prices or valuation techniques that require inputs that are both unobservable in the market and significant to the overall fair value measurement. These inputs reflect management's judgment about the assumptions that a market participant would use in pricing the asset or liability, and are based on the best available information, some of which is internally developed. The following provides a more detailed discussion of our financial assets and liabilities that we may categorize in level 3 and the related valuation methodology.     •   For certain investment securities available for sale, fair value is measured using information obtained from third-party sources or through the use of pricing models. Management evaluated its methodologies used to determine fair value, but considered the level of observable market information to be insufficient to categorize the securities in level 2.     •   Foreign exchange contracts carried in other assets and accrued expenses and other liabilities are primarily composed of long- dated forward contracts and options. The fair value of long-dated foreign exchange forward contracts is measured using discounted cash flow techniques. However, in certain circumstances, extrapolation is required to develop certain forward points, which are not observable. The fair value of foreign exchange options is measured using an option pricing model. Because of a limited number of observable transactions, certain model inputs are unobservable, such as volatilities, and are based on historical experience.     •   The fair value of certain interest-rate caps with long-dated maturities, also carried in other assets and accrued expenses and other liabilities, is measured using a matrix pricing approach. Observable market prices are not available for these derivatives, so extrapolation is necessary to value these instruments, since they have a strike and/or maturity outside of the matrix. The following tables present information with respect to our financial assets and liabilities carried at fair value in our consolidated statement of condition as of the dates indicated. No significant transfers of financial assets or liabilities between levels 1 and 2 occurred during 2011 or 2010.     Fair Value Measurements on a Recurring Basis as of December 31, 2011   (In millions)   Quoted Market Prices in Active Markets (Level 1)     Pricing Methods with Significant Observable Market Inputs (Level 2)     Pricing Methods with Significant Unobservable Market Inputs (Level 3)     Impact  of Netting(1)     Total Net Carrying Value in Consolidated Statement of Condition   Assets:           Trading account assets:           U.S. government securities   $ 20            $ 20    Non-U.S. government securities     498              498    Other     51      $ 138            189    Investment securities available for sale:           U.S. Treasury and federal agencies:           Direct obligations     1,727        1,109            2,836    Mortgage-backed securities     —        28,832      $ 1,189          30,021    Asset-backed securities:           Student loans     —        15,685        860          16,545    Credit cards     —        10,396        91          10,487    Sub-prime     —        1,404        —          1,404    Other     —        667        2,798          3,465                                      Total asset-backed securities     —        28,152        3,749          31,901                                      Non-U.S. debt securities:           Mortgage-backed securities     —        9,418        1,457          10,875    Asset-backed securities     —        2,535        1,768          4,303    Government securities     —        1,671        —          1,671    Other     —        2,754        71          2,825                                      Total non-U.S. debt securities     —        16,378        3,296          19,674                                      State and political subdivisions     —        6,997        50          7,047    Collateralized mortgage obligations     —        3,753        227          3,980    Other U.S. debt securities     —        3,613        2          3,615    U.S. equity securities     —        640        —          640    Non-U.S. equity securities     1        117        —          118                                      Total investment securities available for sale     1,728        89,591        8,513          99,832    Other assets:           Derivative instruments:           Foreign exchange contracts     —        12,045        168        Interest-rate contracts     —        1,795        10        Other     —        1        —                                    Total derivative instruments     —        13,841        178      $ (7,653 )      6,366    Other     110        —        —        —        110                                            Total assets carried at fair value   $ 2,407      $ 103,570      $ 8,691      $ (7,653 )    $ 107,015                                            Liabilities:           Accrued expenses and other liabilities:           Derivative instruments:           Foreign exchange contracts     $ 12,191      $ 161        Interest-rate contracts       1,970        11        Other       1        9                              Total derivative instruments       14,162        181      $ (7,653 )    $ 6,690    Other   $ 110        —        20        —        130                                            Total liabilities carried at fair value   $ 110      $ 14,162      $ 201      $ (7,653 )    $ 6,820                                            (1) Represents counterparty netting against level 2 financial assets and liabilities, where a legally enforceable master netting agreement exists between State Street and the counterparty. This netting cannot be disaggregated by type of derivative instrument.       Fair Value Measurements on a Recurring Basis as of December 31, 2010   (In millions)   Quoted Market Prices in Active Markets (Level 1)     Pricing Methods with Significant Observable Market Inputs (Level 2)     Pricing Methods with Significant Unobservable Market Inputs (Level 3)     Impact  of Netting(1)     Total Net Carrying Value in Consolidated Statement of Condition   Assets:           Trading account assets:           U.S. government securities   $ 20            $ 20    Non-U.S. government securities     297              297    Other     40      $ 122            162    Investment securities available for sale:           U.S. Treasury and federal agencies:           Direct obligations     6,529        1,048            7,577    Mortgage-backed securities     —        22,967      $ 673          23,640    Asset-backed securities:           Student loans     —        13,181        1,234          14,415    Credit cards     —        7,560        43          7,603    Sub-prime     —        1,818        —          1,818    Other     —        569        2,000          2,569                                      Total asset-backed securities     —        23,128        3,277          26,405                                      Non-U.S. debt securities           Mortgage-backed securities     —        5,898        396          6,294    Asset-backed securities     —        1,046        740          1,786    Government securities     —        2,004        1          2,005    Other     —        1,924        8          1,932                                      Total non-U.S. debt securities     —        10,872        1,145          12,017                                      State and political subdivisions     —        6,554        50          6,604    Collateralized mortgage obligations     —        1,502        359          1,861    Other U.S. debt securities     —        2,533        3          2,536    U.S. equity securities     —        1,115        —          1,115    Non-U.S. equity securities     7        119        —          126                                      Total investment securities available for sale     6,536        69,838        5,507          81,881                                      Other assets:           Derivative instruments:           Foreign exchange contracts     —        7,804        254        Interest-rate contracts     —        165        —        Other     —        2        —                                    Total derivative instruments     —        7,971        254      $ (2,970 )      5,255    Other     168        —        —        —        168                                            Total assets carried at fair value   $ 7,061      $ 77,931      $ 5,761      $ (2,970 )    $ 87,783                                            Liabilities:           Accrued expenses and other liabilities:           Trading account liabilities:           U.S. government securities   $ 210            $ 210    Non-U.S. government securities     345              345    Derivative instruments:           Foreign exchange contracts     —      $ 8,195      $ 260        Interest-rate contracts     1        358        —        Other     —        1        9                                    Total derivative instruments     1        8,554        269      $ (2,970 )      5,854    Other     168        3        —        —        171                                            Total liabilities carried at fair value   $ 724      $ 8,557      $ 269      $ (2,970 )    $ 6,580                                            (1) Represents counterparty netting against level 2 financial assets and liabilities, where a legally enforceable master netting agreement exists between State Street and the counterparty. This netting cannot be disaggregated by type of derivative instrument.   The following tables present activity related to our financial assets and liabilities categorized in level 3 of the valuation hierarchy during the years indicated. Transfers into and out of level 3 are reported as of the beginning of the period. During 2011 and 2010, transfers out of level 3 were substantially related to certain mortgage- or asset-backed securities and non-U.S. debt securities, for which fair value was measured using prices for which observable market information became available.     Fair Value Measurements Using Significant Unobservable Inputs Year Ended December 31, 2011                         Total Realized Unrealized Gains (Losses)                                   Change in Unrealized Gains (Losses) Related to Financial Instruments Held at December 31, 2011   (In millions)   Fair Value at December 31, 2010     Transfers in to Level 3     Transfers out of Level 3     Included in Revenue     Included in Other Comprehensive Income     Purchases     Issuances     Sales     Settlements     Fair Value at December 31, 2011     Assets:                       Investment securities available for sale:                       U.S. Treasury and federal agencies:                       Direct Obligations       $ (40 )        $ 40              Mortgage-backed securities   $ 673          (936 )      $ 1        1,540          $ (89 )    $ 1,189      Asset-backed securities:                       Student loans     1,234          (785 )    $ 3        (21 )      421            8        860      Credit cards     43          (285 )      4        (2 )      301            30        91      Sub-prime     —          —        —        —        —            —        —      Other     2,000      $ 114        (245 )      31        6        1,073        $ (49 )      (132 )      2,798                                                                                        Total asset-backed securities     3,277        114        (1,315 )      38        (17 )      1,795          (49 )      (94 )      3,749                                                                                        Non-U.S. debt securities                       Mortgage-backed securities     396        —        (838 )      —        (9 )      1,920          —        (12 )      1,457      Asset-backed securities     740        —        (939 )      1        7        2,179          (3 )      (217 )      1,768      Government securities     1        —        —        —        —        —          —        (1 )      —      Other     8        —        —        —        —        65          —        (2 )      71                                                                                        Total non-U.S. debt securities     1,145        —        (1,777 )      1        (2 )      4,164          (3 )      (232 )      3,296                                                                                        State and political subdivisions     50        1        (3 )      —        —        2          —        —        50      Collateralized mortgage obligations     359        —        (519 )      522        (4 )      428          —        (559 )      227      Other U.S. debt securities     3        —        —        —        —        —          —        (1 )      2                                                                                        Total investment securities available for sale     5,507        115        (4,590 )      561        (22 )      7,969          (52 )      (975 )      8,513                                                                                        Other assets:                       Derivative instruments:                       Foreign exchange contracts     254        —        —        (134 )      —        236          —        (188 )      168      $ (68 )  Interest-rate contracts     —        —        —        10        —        7          (7 )      —        10        9                                                                                            Total derivative instruments     254        —        —        (124 )      —        243          (7 )      (188 )      178        (59 )                                                                                          Total assets carried at fair value   $ 5,761      $ 115      $ (4,590 )    $ 437      $ (22 )    $ 8,212        —      $ (59 )    $ (1,163 )    $ 8,691      $ (59 )                                                                                                Fair Value Measurements Using Significant Unobservable Inputs Year Ended December 31, 2011                         Total Realized Unrealized (Gains} Losses                                   Change in Unrealized (Gains) Losses Related to Financial Instruments Held at December 31, 2011   (In millions)   Fair Value at December 31, 2010     Transfers in to Level 3     Transfers out of Level 3     Included in Revenue     Included in Other Comprehensive Income     Purchases     Issuances     Sales     Settlements     Fair Value at December 31, 2011     Liabilities:                       Accrued expenses and other liabilities:                       Derivative instruments:                       Foreign exchange contracts   $ 260          $ (122 )        $ 219        $ (196 )    $ 161      $ (60 )  Interest-rate contracts     —            11        $ (7 )      14      $ (7 )      —        11        10    Other     9            —            —        —        —        9        —                                                                                            Total derivative instruments     269            (111 )        (7 )      233        (7 )      (196 )      181        (50 )  Other     —            —            20        —        —        20        —                                                                                            Total liabilities carried at fair value   $ 269        —        —      $ (111 )      —      $ (7 )    $  253      $ (7 )    $ (196 )    $ 201      $ (50 )                                                                                                Fair Value Measurements Using Significant Unobservable Inputs Year  Ended December 31, 2010             Total Realized and Unrealized Gains (Losses)     Purchases, Issuances and Settlements, Net     Transfers Into and/or Out of Level 3     Fair Value at December 31, 2010     Change in Unrealized Gains (Losses) Related to Financial Instruments Held at December 31, 2010   (In millions)   Fair Value at December 31, 2009     Recorded in Revenue     Recorded in Other Comprehensive Income           Assets:               Investment securities available for sale:               U.S. Treasury and federal agencies:               Mortgage-backed securities   $ 58      $ (1 )    $ (1 )    $ 659      $ (42 )    $ 673      Asset-backed securities:               Student loans     3,175        9        81        (317 )      (1,714 )      1,234      Credit cards     312        17        (16 )      (31 )      (239 )      43      Sub-prime     3        1        —          —          (4 )      —        Other     2,507        92        160        (444 )      (315 )      2,000      Total asset-backed securities     5,997        119        225        (792 )      (2,272 )      3,277      Non-U.S. debt securities               Mortgage-backed securities     768        35        7        576        (990 )      396      Asset-backed securities     361        24        31        686        (362 )      740      Government securities     —          —          —          1        —          1      Other     40        (1 )      3        (39 )      5        8      Total non-U.S. debt securities     1,169        58        41        1,224        (1,347 )      1,145      State and political subdivisions     2        —          —          (1 )      49        50      Collateralized mortgage obligations     199        (35 )      6        362        (173 )      359      Other U.S. debt securities     3        —          —          —          —          3      Total investment securities available for sale     7,428        141        271        1,452        (3,785 )      5,507                                                        Other assets:               Derivatives-foreign exchange contracts     128        (55 )      —          181        —          254      $ (41 )  Total assets carried at fair value   $ 7,556      $ 86      $ 271      $ 1,633      $   (3,785 )    $   5,761      $   (41 )                                                                Fair Value Measurements Using Significant Unobservable Inputs Year  Ended December 31, 2010             Total Realized and Unrealized (Gains) Losses     Purchases, Issuances and Settlements, Net     Transfers Into and/or Out of Level 3     Fair Value at December 31, 2010     Change in Unrealized (Gains) Losses Related to Financial Instruments Held at December 31, 2010   (In millions)   Fair Value at December 31, 2009     Recorded in Revenue     Recorded in Other Comprehensive Income           Liabilities:               Accrued expenses and other liabilities:               Derivative instruments:               Foreign exchange contracts   $ 138      $ (72 )      $ 194        $ 260      $ (36 )  Other     9        —            —            9        —                                                              Total derivative instruments     147        (72 )      —          194        —          269        (36 )  Total liabilities carried at fair value   $ 147      $ (72 )      —        $ 194        —        $ 269      $ (36 )                                                            The following table presents total realized and unrealized gains and losses for the years indicated that were recorded in revenue for our financial assets and liabilities categorized in level 3:      Year Ended December 31, 2011     Year Ended December 31, 2010     Year Ended December 31, 2009   (In millions)    Total Realized and Unrealized Gains (Losses) Recorded in Revenue     Change in Unrealized Gains (Losses) Related to Financial Instruments Held at December 31, 2011     Total Realized and Unrealized Gains (Losses) Recorded in Revenue      Change in Unrealized Gains (Losses) Related to Financial Instruments Held at December 31, 2010     Total Realized and Unrealized Gains (Losses) Recorded in Revenue     Change in Unrealized Gains (Losses) Related to Financial Instruments Held at December 31, 2009   Fee revenue:               Trading services    $ (13 )    $ (9 )    $ 17       $ (5 )    $ 38      $ (5 )  Processing fees and other      —          —          —           —          50        50                                                      Total fee revenue      (13 )      (9 )      17         (5 )      88        45    Net interest revenue      561        —          141         —          (101 )      —                                                        Total revenue    $ 548      $ (9 )    $ 158       $ (5 )    $ (13 )    $ 45                                                      Fair Values of Financial Instruments: Estimates of fair value for financial instruments not carried at fair value on a recurring basis in our consolidated statement of condition, as defined by GAAP, are generally subjective in nature, and are made as of a specific point in time based on the characteristics of the financial instruments and relevant market information. Disclosure of fair value estimates is not required by GAAP for certain items, such as lease financing, equity method investments, obligations for pension and other post-retirement plans, premises and equipment, other intangible assets and income tax assets and liabilities. Accordingly, aggregate fair value estimates presented do not purport to represent, and should not be considered representative of, our underlying "market" or franchise value. In addition, because of potential differences in methodologies and assumptions used to estimate fair values, our estimates of fair value should not be compared to those of other financial institutions. We use the following methods to estimate the fair values of our financial instruments:     •   For financial instruments that have quoted market prices, those quoted prices are used to estimate fair value.     •   For financial instruments that have no defined maturity, have a remaining maturity of 180 days or less, or reprice frequently to a market rate, we assume that the fair value of these instruments approximates their reported value, after taking into consideration any applicable credit risk.     •   For financial instruments for which no quoted market prices are available, fair value is estimated using information obtained from independent third parties, or by discounting the expected cash flows using an estimated current market interest rate for the financial instrument. The generally short duration of certain of our assets and liabilities results in a significant number of financial instruments for which fair value equals or closely approximates the amount reported in our consolidated statement of condition. These financial instruments are reported in the following captions in our consolidated statement of condition: cash and due from banks; interest-bearing deposits with banks; securities purchased under resale agreements; accrued income receivable; deposits; securities sold under repurchase agreements; federal funds purchased; and other short-term borrowings. In addition, due to the relatively short duration of certain of our net loans (excluding leases), we consider fair value for these loans to approximate their reported value. The fair value of other types of loans, such as purchased receivables and CRE loans, is estimated by discounting expected future cash flows using current rates at which similar loans would be made to borrowers with similar credit ratings for the same remaining maturities. Loan commitments have no reported value because their terms are at prevailing market rates. The following table presents the reported amounts and estimated fair values of the financial instruments defined by GAAP, excluding the aforementioned short-term financial instruments and financial assets and liabilities carried at fair value on a recurring basis, as of the dates indicated:      Reported      Fair   (In millions)    Amount      Value   2011:       Financial Assets:       Investment securities held to maturity    $ 9,321       $ 9,362    Net loans (excluding leases)      8,777         8,752    Financial Liabilities:       Long-term debt      8,131         8,206    2010:       Financial Assets:       Investment securities held to maturity    $ 12,249       $ 12,576    Net loans (excluding leases)      10,387         10,242    Financial Liabilities:       Long-term debt      8,550         8,498

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Equity-Based Compensation	12 Months Ended
Dec. 31, 2011
Equity-Based Compensation [Abstract]
Equity-Based Compensation	Note 14.     Equity-Based Compensation In May 2009, our shareholders amended the 2006 Equity Incentive Plan to increase the number of shares of common stock approved for issuance for stock and stock-based awards, including stock options, stock appreciation rights, restricted stock, deferred stock and performance awards, from 20 million shares to 37 million shares. As of December 31, 2011, a total of 32.84 million shares had been awarded under the 2006 plan, compared with cumulative totals of 26.39 million shares and 17.59 million shares as of December 31, 2010 and 2009, respectively. In addition, up to 8 million shares from our 1997 Equity Incentive Plan were approved for issuance under the 2006 Plan. This included shares that were available for issuance when the plan expired on December 18, 2006, and any shares that subsequently become available for issuance due to cancellations and forfeitures. We have stock options outstanding from the 1997 Plan. As of December 31, 2011, all shares from the 1997 Plan have been awarded and no further grants can be made.   The exercise price of non-qualified and incentive stock options and stock appreciation rights may not be less than the fair value of such shares on the date of grant. Stock options and stock appreciation rights granted under the 1997 and 2006 plans generally vest over four years and expire no later than ten years from the date of grant. For restricted stock awards granted under the plans, common stock is issued at the time of grant and recipients have dividend and voting rights. In general, these grants vest over three to four years. For deferred stock awards granted under the plans, no common stock is issued at the time of grant and the stock does not have dividend and voting rights. Generally, these grants vest over two to four years. Performance awards granted are earned over a performance period based on the achievement of defined goals, generally over one to four years. Payment for performance awards is made in shares of our common stock equal to its fair market value per share, based on certain financial ratios, after the conclusion of each performance period. No common stock options or stock appreciation rights were granted in 2011 or 2010. The weighted-average assumptions used in connection with the option-pricing model were as follows for options granted in 2009:        2009   Dividend yield      4.82 %  Expected volatility      26.70    Risk-free interest rate      2.49    Expected option lives (in years)      7.8    Compensation expense related to stock options, stock appreciation rights, restricted stock awards, deferred stock awards and performance awards, which we record as a component of compensation and employee benefits expense in our consolidated statement of income, was $261 million, $229 million and $126 million for the years ended December 31, 2011, 2010 and 2009, respectively. The 2011 and 2010 expense excluded $25 million and $12 million, respectively, associated with acceleration of expense in connection with the reductions in force discussed in note 20. This expense was included in the severance-related portion of the associated restructuring charges. The aggregate income tax benefit recorded in our consolidated statement of income related to the compensation expense recorded as a component of compensation and employee benefits expense was $103 million, $95 million and $50 million for the years ended December 31, 2011, 2010 and 2009, respectively. The following table presents information about the 2006 Plan and 1997 Plan as of December 31, 2011, and related activity during the years indicated:      Shares (in thousands)     Weighted Average Exercise Price      Weighted Average Remaining Contractual Term (in years)      Aggregate Intrinsic Value (in millions)   Stock Options and Stock Appreciation Rights:            Outstanding at December 31, 2009      13,167      $ 51.64          Exercised      (297 )      37.53          Forfeited or expired      (1,887 )      54.76          Outstanding at December 31, 2010      10,983        51.49          Exercised      (1,028 )      40.52          Forfeited or expired      (2,246 )      50.06                           Outstanding at December 31, 2011      7,709      $ 53.37         3.2       $ 10                     Exercisable at December 31, 2011      7,221      $ 53.69         2.9       $ 4    The weighted-average grant date fair value of stock options granted in 2009 was $2.96 per share. The total intrinsic value of options exercised during the years ended December 31, 2011, 2010 and 2009 was $6 million, $2 million and $5 million, respectively. As of December 31, 2011, total unrecognized compensation cost, net of estimated forfeitures, related to stock options and stock appreciation rights was less than $1 million, which is expected to be recognized over a weighted- average period of 7 months.   The following tables present activity related to other common stock awards during the years indicated:      Shares (in thousands)     Weighted- Average Grant Date Fair Value   Restricted Stock Awards:      Outstanding at December 31, 2009      1,247      $ 41.87    Granted      5,264        44.49    Vested      (489 )      52.87    Forfeited      (221 )      44.95    Outstanding at December 31, 2010      5,801        43.21    Vested      (1,509 )      42.96    Forfeited      (127 )      44.59    Outstanding at December 31, 2011      4,165      $ 43.25    The weighted-average grant date fair value of restricted stock awards granted in 2009 was $34.58 per share. The total fair value of restricted stock awards vested was $66 million, $23 million and $20 million for the years ended December 31, 2011, 2010 and 2009, respectively. As of December 31, 2011, total unrecognized compensation cost, net of estimated forfeitures, related to restricted stock was $101 million, which is expected to be recognized over a weighted-average period of 2.1 years.      Shares (in  thousands)     Weighted-Average Grant Date Fair Value   Deferred Stock Awards:      Outstanding at December 31, 2009      6,573      $ 51.88    Granted      2,287        42.45    Vested      (2,356 )      57.76    Forfeited      (313 )      43.13               Outstanding at December 31, 2010      6,191        46.71    Granted      5,468        41.92    Vested      (2,361 )      52.86    Forfeited      (345 )      41.99               Outstanding at December 31, 2011      8,953      $ 42.34               The weighted-average grant date fair value of deferred stock awards granted in 2009 was $25.51 per share. The total fair value of deferred stock awards vested was $107 million for each of the years ended December 31, 2011 and 2010 and $193 million for the year ended December 31, 2009. As of December 31, 2011, total unrecognized compensation cost, net of estimated forfeitures, related to deferred stock awards was $214 million, which is expected to be recognized over a weighted- average period of 2.6 years.        Shares (in  thousands)     Weighted-Average Grant Date Fair Value   Performance Awards:      Outstanding at December 31, 2009      430      $ 24.14    Granted      1,421        43.33    Forfeited      (716 )      25.72    Paid out      (15 )      64.57               Outstanding at December 31, 2010      1,120        43.89    Granted      1,906        42.28    Forfeited      (173 )      42.90    Paid out      (224 )      46.03               Outstanding at December 31, 2011      2,629      $ 42.52                 The weighted-average grant date fair value of performance awards granted in 2009 was $19.46 per share. The total fair value of performance awards paid out was $10 million, $12 million and $23 million for the years ended December 31, 2011, 2010 and 2009, respectively. As of December 31, 2011, total unrecognized compensation cost, net of estimated forfeitures, related to performance awards was $29 million, which is expected to be recognized over a weighted-average period of 1.7 years. We utilize either treasury shares or authorized but unissued shares to satisfy the issuance of common stock under our equity incentive plans. We do not have a specific policy concerning purchases of our common stock to satisfy stock issuances, including exercises of stock options. We have a general policy concerning purchases of our common stock to meet issuances under our employee benefit plans, including option exercises and other corporate purposes. Various factors determine the amount and timing of our purchases of our common stock, including regulatory approvals, our regulatory capital requirements, the number of shares we expect to issue under employee benefit plans, market conditions (including the trading price of our common stock), and legal considerations. These factors can change at any time, and the number of shares of common stock we will purchase or when we will purchase them cannot be assured.

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Regulatory Matters	12 Months Ended
Dec. 31, 2011
Regulatory Matters [Abstract]
Regulatory Matters	Note 15.     Regulatory Matters Regulatory Capital: We are subject to various regulatory capital requirements administered by federal banking agencies. Failure to meet minimum regulatory capital requirements can initiate certain mandatory and discretionary actions by regulators that, if undertaken, could have a direct material effect on our consolidated financial condition. Under regulatory capital adequacy guidelines, we must meet specified capital requirements that involve quantitative measures of our consolidated assets, liabilities and off-balance sheet exposures calculated in accordance with regulatory accounting practices. Our capital components and their classifications are subject to qualitative judgments by the regulators about components, risk weightings and other factors. Quantitative measures established by regulation to ensure capital adequacy require State Street and State Street Bank to maintain minimum risk-based capital and leverage ratios as set forth in the following table. The risk-based capital ratios are tier 1 capital and total capital, each divided by adjusted total risk-weighted assets and market-risk equivalents, and the tier 1 leverage ratio is tier 1 capital divided by adjusted quarterly average assets. As of December 31, 2011 and 2010, State Street and State Street Bank met all regulatory capital adequacy requirements to which they were subject. As of December 31, 2011, State Street Bank was categorized as "well capitalized" under the regulatory capital adequacy framework. To be categorized as "well capitalized," State Street Bank must meet or exceed the minimum ratios for "well capitalized," as set forth in the following table, and meet certain other requirements. State Street Bank exceeded all "well capitalized" ratio guidelines as of December 31, 2011 and 2010. Management believes that no conditions or events have occurred since December 31, 2011 that have changed the capital categorization of State Street Bank.   The following table presents regulatory capital ratios and related components as of December 31:        Regulatory Guidelines(1)     State Street     State Street Bank   (Dollars in millions)    Minimum     Well Capitalized     2011     2010     2011     2010   Risk-based ratios:              Tier 1 capital      4 %      6 %      18.8 %      20.5 %      17.6 %      18.1 %  Total capital      8        10        20.5        22.0        19.6        19.9    Tier 1 leverage ratio      4        5        7.3        8.2        6.7        7.1    Total shareholders' equity        $ 19,398      $ 17,787      $ 18,494      $ 16,697    Trust preferred capital securities          950        1,450        —        —    Net unrealized loss on available-for-sale securities and cash flow hedges          395        680        398        682    Deferred tax liability associated with acquisitions          757        748        737        748    Recognition of pension plan funded status          248        186        245        187    Less:              Goodwill          5,645        5,597        5,353        5,365    Other intangible assets          2,459        2,593        2,297        2,460    Other deductions(2)          —        336        —        —                                         Tier 1 capital          13,644        12,325        12,224        10,489    Qualifying subordinated debt          1,339        959        1,343        959    Allowances for on- and off-balance sheet credit exposures          40        116        40        117    Unrealized gain on available-for-sale equity securities          —        2        —        —                                         Tier 2 capital          1,379        1,077        1,383        1,076    Deduction for investments in finance subsidiaries          (181 )      (171 )      —        —                                         Total capital        $ 14,842      $ 13,231      $ 13,607      $ 11,565                                         Adjusted total risk-weighted assets and market-riskequivalents:              On-balance sheet        $ 52,642      $ 46,209      $ 49,659      $ 44,103    Off-balance sheet          19,115        13,177        19,109        13,177    Market-risk equivalents          661        791        611        750                                         Total        $ 72,418      $ 60,177      $ 69,379      $ 58,030                                         Adjusted quarterly average assets        $ 186,336      $ 150,770      $ 183,086      $ 147,908                                         (1)  State Street Bank must comply with the regulatory guideline for "well capitalized" in order for the parent company to maintain its status as a financial holding company, including maintaining a minimum tier 1 risk-based capital ratio of 6%, a minimum total risk- based capital ratio of 10%, and a tier 1 leverage ratio of 5%. The "well capitalized" guideline requires us to maintain a minimum tier 1 risk-based capital ratio of 6% and a minimum total risk-based capital ratio of 10%.   (2)  Amounts included deferred tax assets not eligible for inclusion in regulatory capital. Cash, Dividend, Loan and Other Restrictions: During 2011, our banking subsidiaries were required by the Federal Reserve to maintain average aggregate cash balances of approximately $3.6 billion to satisfy reserve requirements. Federal and state banking regulations place certain restrictions on dividends paid by banking subsidiaries to a parent company. For 2012, aggregate dividends by State Street Bank without prior regulatory approval are limited to approximately $2.26 billion of its undistributed earnings at December 31, 2011, plus an additional amount equal to its net profits, as defined, for 2012 up to the date of any dividend. In addition, the prior approval of the Federal Reserve is required for us to pay future common stock dividends.   The Federal Reserve Act requires that extensions of credit by State Street Bank to certain affiliates, including the parent company, be secured by specific collateral, that the extension of credit to any one affiliate be limited to 10% of State Street Bank's capital and surplus, as defined, and that extensions of credit to all such affiliates be limited to 20% of State Street Bank's capital and surplus. At December 31, 2011, our consolidated retained earnings included $442 million representing undistributed earnings of unconsolidated entities that are accounted for under the equity method of accounting.

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Derivative Financial Instruments	12 Months Ended
Dec. 31, 2011
Derivative Financial Instruments [Abstract]
Derivative Financial Instruments	Note 16. Derivative Financial Instruments We use derivative financial instruments to support our clients' needs and to manage our interest-rate and currency risk. In undertaking these activities, we assume positions in both the foreign exchange and interest-rate markets by buying and selling cash instruments and using derivative financial instruments, including foreign exchange forward contracts, foreign exchange and interest-rate options and interest-rate swaps, interest-rate forward contracts and interest-rate futures. Interest-rate contracts involve an agreement with a counterparty to exchange cash flows based on the movement of an underlying interest-rate index. An interest-rate swap agreement involves the exchange of a series of interest payments, either at a fixed or variable rate, based on the notional amount without the exchange of the underlying principal amount. An interest-rate option contract provides the purchaser, for a premium, the right, but not the obligation, to receive an interest rate based upon a predetermined notional amount during a specified period. An interest-rate futures contract is a commitment to buy or sell, at a future date, a financial instrument at a contracted price; it may be settled in cash or through the delivery of the contracted instrument. Foreign exchange contracts involve an agreement to exchange one currency for another currency at an agreed-upon rate and settlement date. Foreign exchange contracts generally consist of foreign exchange forward and spot contracts, option contracts and cross-currency swaps. Future cash requirements, if any, related to foreign exchange contracts are represented by the gross amount of currencies to be exchanged under each contract unless we and the counterparty have agreed to pay or to receive the net contractual settlement amount on the settlement date. Derivative financial instruments involve the management of interest-rate and foreign currency risk, and involve, to varying degrees, market risk and credit and counterparty risk (risk related to repayment). Market risk is defined as the risk of adverse financial impact due to fluctuations in interest rates, foreign exchange rates and other market-driven factors and prices. We use a variety of risk management tools and methodologies to measure, monitor and manage the market risk associated with our trading activities. One such risk-management measure is value-at-risk, or VaR. VaR is an estimate of potential loss for a given period within a stated statistical confidence interval. We use a risk-measurement system to estimate VaR daily. We have adopted standards for estimating VaR, and we maintain regulatory capital for market risk in accordance with federal regulatory capital guidelines. Derivative financial instruments are also subject to credit and counterparty risk, which is defined as the risk of financial loss if a borrower or counterparty is either unable or unwilling to repay borrowings or settle a transaction in accordance with the underlying contractual terms. We manage credit and counterparty risk by performing credit reviews, maintaining individual counterparty limits, entering into netting arrangements and requiring the receipt of collateral. Collateral requirements are determined after a comprehensive review of the creditworthiness of each counterparty, and the requirements are monitored and adjusted daily. Collateral is generally held in the form of cash or highly liquid U.S. government securities. We may be required to provide collateral to the counterparty in connection with our entry into derivative financial instruments. Collateral received and collateral provided in connection with derivative financial instruments is recorded in accrued expenses and other liabilities and other assets, respectively, in our consolidated statement of condition. As of December 31, 2011 and 2010, we had approximately $1.15 billion and $79 million, respectively, of cash collateral received and approximately $1.48 billion and $530 million, respectively, of cash collateral provided in connection with derivative financial instruments. We enter into master netting agreements with many of our derivative counterparties. Certain of these agreements contain credit risk-related contingent features in which the counterparty has the option to declare State Street in default and accelerate cash settlement of our net derivative liabilities with the counterparty in the event our credit rating falls below specified levels. The aggregate fair value of all derivative instruments with credit risk-related contingent features that were in a net liability position as of December 31, 2011 totaled approximately $911 million, against which we had posted aggregate collateral of approximately $276 million. If State Street's credit rating were downgraded below levels specified in the agreements, the maximum additional amount of payments related to termination events that could have been required pursuant to these contingent features as of December 31, 2011 was approximately $635 million. Such accelerated settlement would not affect our consolidated results of operations. Derivatives Not Designated as Hedging Instruments: In connection with our trading activities, we use derivative financial instruments in our role as a financial intermediary and as both a manager and servicer of financial assets, in order to accommodate our clients' investment and risk management needs. In addition, we use derivative financial instruments for risk management purposes as economic hedges, which are not formally designated as accounting hedges, in order to contribute to our overall corporate earnings and liquidity. These activities are designed to generate trading revenue and to manage volatility in our net interest revenue. The level of market risk that we assume is a function of our overall objectives and liquidity needs, our clients' requirements and market volatility. With respect to cross-border investing, clients have a need for foreign exchange forward contracts to convert currency for international investment and to manage the currency risk in their investment portfolios. As an active participant in the foreign exchange markets, we provide foreign exchange forward contracts and options in support of our clients' needs with respect to their management of currency risk. We also participate in the interest-rate markets, and provide interest-rate swaps, interest-rate forward contracts, interest-rate futures and other interest-rate contracts to our clients to enable them to mitigate or modify their interest-rate risk. As part of our trading activities, we may assume positions in both the foreign exchange and interest-rate markets by buying and selling cash instruments and using derivative financial instruments, including foreign exchange forward contracts, foreign exchange and interest-rate options and interest-rate swaps, interest-rate forward contracts, and interest-rate futures. In the aggregate, positions are matched closely to minimize currency and interest-rate risk. Gains or losses in the fair values of trading derivatives are recorded in trading services revenue in our consolidated statement of income. We offer products that provide book-value protection primarily to plan participants in stable value funds managed by non- affiliated investment managers of post-retirement defined contribution benefit plans, particularly 401(k) plans. We account for the associated contingencies, more fully described in note 10, individually as derivatives not designated as hedging instruments. These contracts are valued quarterly and unrealized losses, if any, are recorded in other expenses in our consolidated statement of income. Derivatives Designated as Hedging Instruments: In connection with our asset and liability management activities, we use derivative financial instruments to manage our interest-rate risk. Interest-rate risk, defined as the sensitivity of income or financial condition to variations in interest rates, is a significant non-trading market risk to which our assets and liabilities are exposed. These hedging relationships are formally designated, and qualify for hedge accounting, as fair value or cash flow hedges. We manage interest-rate risk by identifying, quantifying and hedging our exposures, using fixed-rate portfolio securities and a variety of derivative financial instruments, most frequently interest-rate swaps and options (e.g., interest rate caps and floors). Interest-rate swap agreements alter the interest-rate characteristics of specific balance sheet assets or liabilities. When appropriate, forward rate agreements, options on swaps, and exchange-traded futures and options are also used. Fair value hedges Derivatives designated as fair value hedges are utilized to mitigate the risk of changes in fair value of recognized assets and liabilities. Gains and losses on fair value hedges are recorded in processing fees and other revenue in our consolidated statement of income along with the gain or loss on the asset or liability attributable to the hedged risk. Differences between the gains and losses on fair value hedges and the gains and losses on the asset or liability attributable to the hedged risk represent hedge ineffectiveness, which is recorded in net interest revenue or in processing fees and other revenue. We use interest-rate or foreign exchange contracts in this manner to manage our exposure to changes in the fair value of hedged items caused by changes in interest rates or foreign exchange rates. We have entered into interest-rate swap agreements to modify our interest revenue from certain available-for-sale securities from a fixed rate to a floating rate. The securities hedged have a weighted-average life of approximately 7.4 years as of December 31, 2011, compared to 7.7 years as of December 31, 2010. These securities are hedged with interest-rate swap contracts of similar maturity, repricing and fixed-rate coupons. The interest-rate swap contracts convert the interest revenue from a fixed rate to a floating rate indexed to LIBOR, thereby mitigating our exposure to fluctuations in the fair value of the securities attributable to changes in the benchmark interest rate. We have entered into interest-rate swap agreements to modify our interest expense on two senior notes and two subordinated notes from fixed rates to floating rates. The senior notes are due in 2016 and 2021; one pays fixed interest at a 2.875% annual rate and the other pays fixed interest at a 4.375% annual rate. The subordinated notes mature in 2018; one pays fixed interest at a 4.956% annual rate and the other pays fixed interest at a 5.25% annual rate. The senior and subordinated notes are hedged with interest-rate swap contracts with notional amounts, maturities and fixed-rate coupon terms that align with the hedged notes. The interest-rate swap contracts convert the fixed-rate coupons to floating rates indexed to LIBOR, thereby mitigating our exposure to fluctuations in the fair values of the subordinated notes stemming from changes in the benchmark interest rates. We have entered into forward foreign exchange contracts to hedge the change in fair value attributable to foreign-exchange movements in the funding of non-functional currency denominated investment securities. These forward contracts convert the foreign currency risk to U.S. dollars, thereby mitigating our exposure to fluctuations in the fair value of the securities attributable to changes in foreign exchange rates. Generally, no ineffectiveness is recorded in earnings, since the notional amount of the hedging instruments is aligned with the carrying value of the hedged securities. The forward points on the hedging instruments are considered to be a hedging cost, and accordingly are excluded from the evaluation of hedge effectiveness and recorded in net interest revenue. Cash flow hedges Derivatives categorized as cash flow hedges are utilized to offset the variability of cash flows to be received from or paid on a floating-rate asset or liability. Gains and losses on cash flow hedges that are considered highly effective are recorded in accumulated OCI in our consolidated statement of condition until earnings are affected by the hedged item. When gains or losses are reclassified from accumulated OCI into earnings, they are recorded in net interest revenue in our consolidated statement of income. The ineffectiveness of cash flow hedges, defined as the extent to which the changes in fair value of the derivative exceeded the variability of cash flows of the forecasted transaction, is recorded in processing fees and other revenue. We have entered into interest-rate swap agreements to modify our interest revenue from certain available-for-sale securities from a floating rate to a fixed rate. The securities hedged have a weighted-average life of approximately 2.8 years as of December 31, 2011, compared to 3.8 years as of December 31, 2010. These securities are hedged with interest-rate swap contracts of similar maturities, repricing and other characteristics. The interest-rate swap contracts convert the interest revenue from a floating rate to a fixed rate, thereby mitigating our exposure to fluctuations in the cash flows of the securities attributable to changes in the benchmark interest rate. The following table presents the aggregate contractual, or notional, amounts of derivative financial instruments entered into in connection with trading and asset and liability management activities as of the dates indicated:   (In millions)    December 31, 2011      December 31, 2010   Derivatives not designated as hedging instruments:       Interest-rate contracts:       Swap agreements and forwards    $ 238,008       $ 52,383    Options and caps purchased      1,431         140    Options and caps written      1,324         130    Futures      66,620         25,253    Foreign exchange contracts:       Forward, swap and spot      1,033,045         637,847    Options purchased      11,215         14,299    Options written      12,342         14,587    Credit derivative contracts:       Credit default swap agreements      105         155    Other:       Stable value contracts      40,963         46,758    Derivatives designated as hedging instruments:       Interest-rate contracts:       Swap agreements      3,872         1,886    Foreign exchange contracts:       Forwards      2,613         —        In connection with our asset and liability management activities, we have entered into interest-rate contracts designated as fair value and cash flow hedges to manage our interest-rate risk. The following table presents the aggregate notional amounts of these interest-rate contracts and the related assets or liabilities being hedged as of the dates indicated:        December 31, 2011      December 31, 2010   (In millions)    Fair Value Hedges      Cash Flow Hedges      Total      Fair Value Hedges      Cash Flow Hedges      Total   Investment securities available for sale    $ 1,298       $ 124       $ 1,422       $ 1,561       $ 125       $ 1,686    Long-term debt(1)      2,450         —           2,450         200         —           200    Total    $ 3,748       $ 124       $ 3,872       $ 1,761       $ 125       $ 1,886                                                          (1)  As of December 31, 2011 and 2010, fair value hedges of long-term debt increased the carrying value of long-term debt presented in our consolidated statement of condition by $140 million and $81 million, respectively. The following table presents the contractual and weighted-average interest rates for long-term debt, which include the effects of the hedges presented in the table above, for the years indicated:      Years Ended December 31,        2011     2010        Contractual Rates     Rate Including Impact of Hedges     Contractual Rates     Rate Including Impact of Hedges   Long-term debt      3.64 %      3.22 %      3.70 %      3.30 %  For cash flow hedges, any changes in the fair value of the derivative financial instruments remain in accumulated OCI and are generally recorded in our consolidated statement of income in future periods when earnings are affected by the variability of the hedged cash flow. The following table presents the fair value of the derivative financial instruments, excluding the impact of master netting agreements, recorded in our consolidated statement of condition as of the dates indicated. The impact of master netting agreements is disclosed in note 13. Asset Derivatives      Liability Derivatives         December 31, 2011      December 31, 2011   (In millions)    Balance Sheet Location    Fair Value      Balance Sheet Location    Fair Value   Derivatives not designated as hedging instruments:             Foreign exchange contracts    Other assets    $ 12,210       Other liabilities    $ 12,315    Interest-rate contracts    Other assets      1,682       Other liabilities      1,688    Other derivative contracts    Other assets      1       Other liabilities      10                            Total       $ 13,893          $ 14,013                            Derivatives designated as hedging instruments:             Interest-rate contracts    Other assets    $ 123       Other liabilities    $ 293    Foreign exchange contracts    Other assets      3       Other liabilities      37                            Total       $ 126          $ 330                                  Asset Derivatives      Liability Derivatives        December 31, 2010      December 31, 2010   (In millions)   Balance Sheet Location    Fair Value      Balance Sheet Location    Fair Value   Derivatives not designated as hedging instruments:            Foreign exchange contracts   Other assets    $ 8,058       Other liabilities    $ 8,455    Interest-rate contracts   Other assets            133       Other liabilities          131    Other derivative contracts   Other assets      2       Other liabilities      10                           Total      $ 8,193          $ 8,596                           Derivatives designated as hedges:            Interest-rate contracts   Other assets    $ 32       Other liabilities    $ 228                           Total      $ 32          $ 228                           The following tables present the impact of our use of derivative financial instruments on our consolidated statement of income for the years indicated:      Location of Gain (Loss) on Derivative in Consolidated Statement of Income    Amount of Gain (Loss) on Derivative Recognized in Consolidated Statement of Income   (In millions)         Year ended December 31, 2011      Year Ended December 31, 2010     Year Ended December 31, 2009   Derivatives not designated as hedging instruments(1):            Interest-rate contracts    Trading services revenue    $ 21       $ 7      Interest-rate contracts    Processing fees and other revenue      —           10      $ 5    Foreign exchange contracts    Trading services revenue      641         618        677    Foreign exchange contracts    Processing fees and other revenue      7         (4 )      (5 )  Other derivative contracts    Trading services revenue      —           —          (3 )                               Total       $ 669       $ 631      $ 674                                 (1) Losses on derivatives related to book-value protection provided to stable value funds are recorded in other expenses, and totaled approximately $5 million, and $9 million, respectively, for the years ended December 31, 2010 and 2009. There were no losses related to stable value funds for the year ended December 31, 2011.     Location of Gain (Loss) on Derivative in Consolidated Statement of Income   Amount of Gain (Loss)  on Derivative Recognized in Consolidated Statement of Income     Hedged Item in Fair Value Hedging Relationship   Location of Gain (Loss) on Hedged Item in Consolidated Statement of Income   Amount of Gain (Loss)  on Hedged Item Recognized in Consolidated Statement of Income         Year Ended December 31,             Year Ended December 31,   (In millions)       2011     2010     2009             2011     2010     2009   Derivatives designated as fair value hedges:                   Interest-rate contracts   Processing fees and other revenue       $ (22 )    Deposits   Processing fees and other revenue       $ 22    Interest-rate contracts   Processing fees and other revenue   $ 75      $ 57        (30 )    Long-term debt   Processing fees and other revenue   $ (70 )    $ (49 )      30    Interest-rate contracts   Processing fees and other revenue     (165 )      (43 )      200      Available-for-sale securities   Processing fees and other revenue     153        40        (208 )  Foreign exchange contracts   Processing fees and other revenue     (161 )      —          —        Investment securities   Processing fees and other revenue     161        —          —      Total     $ (251 )    $ 14      $ 148          $ 244      $ (9 )    $ (156 )                                        Differences between the gains (losses) on the derivative and the gains (losses) on the hedged item, excluding any amounts recorded in net interest revenue, represent hedge ineffectiveness.       Amount of Gain (Loss) on Derivative Recognized in Other Comprehensive Income     Location of Gain (Loss) Reclassified from OCI to Consolidated Statement of Income   Amount of Gain (Loss) Reclassified from OCI to Consolidated Statement of Income     Location of Gain (Loss) on Derivative Recognized in Consolidated Statement of Income   Amount of Gain (Loss) on Derivative Recognized in Consolidated Statement of Income       Year Ended December 31,         Year Ended December 31,         Year Ended December 31,   (In millions)   2011     2010     2009         2011     2010     2009         2011     2010     2009   Derivatives designated as cash flow hedges:                       Interest-rate contracts   $ 9      $ 7      $ 14      Net interest revenue   $ (7 )    $ (7 )      —      Net interest revenue   $ 3      $ 5        —                                                                                Total   $ 9      $ 7      $ 14        $ (7 )    $ (7 )      —        $ 3      $ 5        —

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Net Interest Revenue	12 Months Ended
Dec. 31, 2011
Net Interest Revenue [Abstract]
Net Interest Revenue	Note 17.     Net Interest Revenue The following table presents the components of interest revenue and interest expense, and related net interest revenue, for the years ended December 31:   (In millions)    2011      2010      2009   Interest revenue:          Deposits with banks Investment securities:    $ 149       $ 93       $ 156    U.S. Treasury and federal agencies      775         682         520    State and political subdivisions      221         222         225    Other investments      1,493         2,109         2,075    Securities purchased under resale agreements and federal funds sold      28         24         24    Loans and leases(1)      278         329         239    Trading account assets      —         —         20    Interest revenue associated with AMLF(2)      —         —         25    Other interest-earning assets      2         3         2                               Total interest revenue      2,946         3,462         3,286    Interest expense:          Deposits      220         213         195    Short-term borrowings(1)      96         257         200    Long-term debt      289         286         304    Interest expense associated with AMLF(2)      —         —         18    Other interest-bearing liabilities      8         7         5                               Total interest expense      613         763         722                               Net interest revenue    $ 2,333       $ 2,699       $ 2,564                               (1)  Amounts for 2010 included $67 million of interest revenue and interest expense related to the third-party asset-backed securitization trusts consolidated into our financial statements on January 1, 2010 in connection with our adoption of new GAAP. These trusts were de-consolidated in June 2010. (2)  Refers to the Federal Reserve's Asset-Backed Commercial Paper Money Market Mutual Fund Liquidity Facility, or AMLF, which expired in February 2010.

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Employee Benefits	12 Months Ended
Dec. 31, 2011
Employee Benefits [Abstract]
Employee Benefits	Note 18.     Employee Benefits State Street Bank and certain of its U.S. subsidiaries participate in a non-contributory, tax-qualified defined benefit pension plan. Since January 1, 2008, when the plan was amended, we no longer make employer contribution credits to the plan; employee account balances earn annual interest credits until the employee's retirement. In addition to the defined benefit pension plan, we have non-qualified unfunded supplemental retirement plans, referred to as SERPs, that provide certain officers with defined pension benefits in excess of allowable qualified plan limits. Non-U.S. employees participate in local defined benefit plans. State Street Bank and certain of its U.S. subsidiaries participate in a post-retirement plan that provides health care and insurance benefits for certain retired employees.   The following tables present combined information for the U.S. and non-U.S. defined benefit plans, and information for the post-retirement plan, as of the December 31 measurement date:      Primary U.S. and Non-U.S. Defined Benefit Plans     Post-Retirement Plan   (In millions)    2011     2010     2011     2010   Benefit obligations:          Beginning of year    $ 905      $ 808      $ 114      $ 112    Service cost      9        11        6        5    Interest cost      47        44        6        6    Employee contributions      1        1        —          —      Plan amendments      (4 )      —          —          —      Acquisitions and transfers      30        3        —          —      Actuarial losses (gains)      67        72        (5 )      (4 )  Benefits paid      (28 )      (28 )      (9 )      (7 )  Expenses paid      (1 )      —          —          —      Settlements      (1 )      (2 )      —          —      Foreign currency translation      (8 )      (4 )      —          —      Adjustment for rounding      —          —          —          2                                     End of year    $ 1,017      $ 905      $ 112      $ 114                                     Plan assets at fair value:          Beginning of year    $ 884      $ 828        Actual return on plan assets      50        84        Employer contributions      8        8      $ 9      $ 7    Acquisitions and transfers      21        (2 )      —          —      Benefits paid      (28 )      (28 )      (9 )      (7 )  Expenses paid      (1 )      —          —          —      Plan settlements      (1 )      (2 )      —          —      Foreign currency translation      (5 )      (4 )      —          —                                       End of year    $ 928      $ 884      $ —        $ —                                       Accrued benefit expense:          Funded status (plan assets less benefit obligations)    $ (89 )    $ (21 )    $ (112 )    $ (114 )                                   Net accrued benefit expense    $ (89 )    $ (21 )    $ (112 )    $ (114 )                                        Primary U.S. and Non-U.S. Defined Benefit Plans     Post- Retirement Plan   (In millions)    2011     2010     2011     2010   Amounts recognized in our consolidated statement of condition as of December 31:          Non-current assets    $ 45      $ 26        Current liabilities      (1 )      (2 )    $ (6 )    $ (9 )  Non-current liabilities      (133 )      (45 )      (106 )      (105 )                                   Net accrued amount recognized in statement of condition    $ (89 )    $ (21 )    $ (112 )    $ (114 )                                   Amounts recognized in accumulated other comprehensive income:          Prior service credit      $ (4 )    $ 3      $ 4    Net loss    $ (307 )      (242 )      (36 )      (43 )                                   Accumulated other comprehensive loss      (307 )      (246 )      (33 )      (39 )  Cumulative employer contributions in excess of net periodic benefit cost      218        225        (79 )      (75 )                                   Net obligation recognized in our consolidated statement of condition    $ (89 )    $ (21 )    $ (112 )    $ (114 )                                   Accumulated benefit obligation    $ 999      $ 887        Actuarial assumptions (U.S. Plans):          Used to determine benefit obligations as of December 31:          Discount rate      4.50 %      5.50 %      4.50 %      5.50 %  Rate of increase for future compensation      —        4.50        —        —    Used to determine periodic benefit cost for the years ended December 31:          Discount rate      5.50 %      6.00 %      5.50 %      6.00 %  Rate of increase for future compensation      4.50        4.50        —        —    Expected long-term rate of return on plan assets      7.25        7.25        —        —    Assumed health care cost trend rates as of December 31:          Cost trend rate assumed for next year      —        —        7.80 %      7.62 %  Rate to which the cost trend rate is assumed to decline      —        —        4.50        4.50    Year that the rate reaches the ultimate trend rate      —        —        2029        2026    The following table presents expected benefit payments for the next ten years: (In millions)    Primary U.S. and  Non-U.S. Defined Benefit Plans      Non- Qualified SERPs      Post-Retirement Plan   2012    $ 33       $ 27       $ 6    2013      33         13         6    2014      34         12         7    2015      35         14         7    2016      27         13         7    2017-2021      169         59         35    The accumulated benefit obligation for all of our U.S. defined benefit pension plans was $872 million and $784 million at December 31, 2011, and 2010, respectively.   To develop the assumption of the expected long-term rate of return on plan assets, we considered the historical returns and the future expectations for returns for each asset class, as well as the target asset allocation of the pension portfolio. This analysis resulted in the determination of the assumed long-term rate of return on plan assets of 7.25% for the year ended December 31, 2011. Plan Assets: The primary purpose of the investment policy and strategy is to invest plan assets in a manner that provides for sufficient resources to be available to meet the plans' benefit and expense obligations when due. The portfolio, together with contributions, is intended to provide adequate liquidity to make benefit payments when due while preserving principal and maximizing returns, given appropriate risk constraints. A secondary but important objective is to enhance the plans' long-term viability through the generation of competitive returns that will limit the financial burden on State Street and contribute to our ability to maintain our retirement program. Plan assets are managed solely in the interests of the participants and consistent with generally recognized fiduciary standards, including all applicable provisions of ERISA and other applicable laws and regulations. Management believes that its investment policy satisfies the standards of prudence and diversification prescribed by ERISA. Plan assets are diversified across asset classes to achieve a balance between risk and return and between income and growth of assets through capital appreciation, to produce a prudently well-diversified portfolio. With respect to the U.S. pension plan, the plan assets are primarily invested in pooled investment funds of State Street Bank. The fair value of the participation units owned by the plans is based on the redemption value on the last business day of the plan year, where values are based on the fair value of the underlying assets in each fund. The net asset value of units of participation in other funds is based on the fair value of the underlying securities in each fund. Alternative investments are composed of investments in limited liability corporations and limited liability partnerships. These investments are valued at fair value as determined by the fund managers, and represent the plans' proportionate share of the estimated fair value of the underlying net assets of the limited liability corporations. The methods described above may produce a fair value calculation that may not be indicative of net realizable value or be reflective of future fair values. Furthermore, while management believes that its valuation methods are appropriate and consistent with other market participants, the use of different methodologies or assumptions to determine the fair value of certain financial instruments could result in a different fair value measurement as of the reporting date. With respect to the U.K. pension plan, the plan assets are invested in sub-funds of Managed Pension Funds Limited, a U.K.-incorporated insurance vehicle of which the ultimate parent company is State Street. These investments are valued based on the mid-market price of the underlying investments held by Managed Pension Funds Limited. This valuation method may produce a calculation that is not indicative of net realizable value or reflective of future fair values.   The following tables present, by level within the fair value hierarchy prescribed by GAAP, the plans' assets measured at fair value on a recurring basis, and activity related to assets categorized in level 3, as of the dates and for the periods indicated:       Fair Value Measurements on a Recurring Basis as of December 31, 2011   (In millions)   Quoted Market Prices in Active Markets (Level 1)     Pricing Methods with Significant Observable Market Inputs (Level 2)     Pricing Methods with Significant Unobservable Market Inputs (Level 3)     Total Net Carrying Value   Assets:         U.S. Pension Plan         Investments in pooled investment funds:         Domestic large cap equity     $ 129        $ 129    Domestic small cap equity       14          14    Developed international equities       62          62    Emerging markets equity       28          28    Investment grade fixed-income       311          311    High yield fixed-income       26          26    Real estate investment trusts       23          23    Alternative investments (commingled fund)       —      $ 5        5    Alternative investments (fund of funds)       —        14        14    Private equity       —        2        2    Cash       6        —        6                                    Total U.S. Pension Plan       —        599        21        620                                    U.K. Pension Plan         Investments in pooled investment funds:         Developed international equity       24        —        24    U.K. fixed-income       187        —        187    Emerging market index       8        —        8    Alternative investments       —        32        32                                    Total U.K. pension plan     —        219        32        251                                    Other Non-U.S. Pension Plans (Excluding U.K.)         Insurance group annuity contracts       —        57        57                                    Total Other Non-U.S. Pension Plans (Excluding U.K.)     —        —        57        57                                    Total assets carried at fair value     —      $ 818      $ 110      $ 928                                        Fair Value Measurements Using Significant Unobservable Inputs Year Ended December 31, 2011       U.S. Pension Plans     U.K. Pension Plan     Non-U.S. Pension Plans (Excluding U.K.)   (In millions)   Alternative Investments     Private Equity     Alternative Investments     Insurance group annuity contract   Assets:         Fair value at December 31, 2010   $ 19      $ 2      $ 33      $ 36    Purchases and sales, net     —        —        (1 )      24    Unrealized losses     —        —        —        (3 )                                  Fair value at December 31, 2011   $ 19      $ 2      $ 32      $ 57                                            Fair Value Measurements on a Recurring Basis as of December 31, 2010   (In millions)   Quoted Market Prices in Active Markets (Level 1)     Pricing Methods with Significant Observable Market Inputs (Level 2)     Pricing Methods with Significant Unobservable Market Inputs (Level 3)     Total Net Carrying Value   Assets:         U.S. Pension Plan         Investments in pooled investment funds:         Domestic large cap equity     $ 120        $ 120    Domestic small cap equity       15          15    Developed international equities       67          67    Emerging markets equity       38          38    Investment grade fixed-income       308          308    High yield fixed-income       31          31    Real estate investment trusts       21          21    Alternative investments (commingled fund)       —      $ 5        5    Alternative investments (fund of funds)       —        14        14    Private equity       —        2        2    Cash       9        —        9                                    Total U.S. Pension Plan       —        609        21        630                                    U.K. Pension Plan         Investments in insurance vehicles:         Developed international equity       33        —        33    U.K. fixed-income       144        —        144    Emerging market index       8        —        8    Alternative investments       —        33        33                                    Total U.K. pension plan     —        185        33        218                                    Other Non-U.S. Pension Plans (Excluding U.K.)         Insurance group annuity contracts       —        36        36                                    Total Other Non-U.S. Pension Plans (Excluding U.K.)     —        —        36        36                                    Total assets carried at fair value     —      $ 794      $ 90      $ 884                                        Fair Value Measurements Using Significant Unobservable Inputs Year Ended December 31, 2010       U.S. Pension Plans     U.K. Pension Plan     Non-U.S. Pension Plans (Excluding U.K.)   (In millions)   Alternative Investments     Private Equity     Alternative Investments     Insurance group annuity contract   Assets:         Fair Value at December 31, 2009   $ 13      $ 2      $ 24      $ 31    Purchases and sales, net     4        —        7        1    Unrealized gains     2        —        2        4                                    Fair value at December 31, 2010   $ 19      $ 2      $ 33      $ 36                                    The plans' investment strategy is intended to reduce the concentration risk of an adverse influence on investment values from the poor performance of a small number of individual investments through diversification of the assets. The significant holdings of the plans are monitored each quarter so that the plans do not fall outside of the allowable maximum amount per issuer. The plans are re-balanced on a monthly basis so that actual weights of the plan assets are within the allowable ranges set forth in the investment policy. The plans' operating cash flows (benefit payments, expenses, contributions) are used to bring the weights back into line on a monthly basis. If these cash flows do not provide enough benefit, additional re-balancing is effected.   Expected employer contributions to the tax-qualified U.S. and Non-U.S. defined benefit pension plans, SERPs, and post-retirement plan for the year ending December 31, 2012 are $7 million, $27 million and $6 million, respectively. State Street has unfunded SERPs that provide certain officers with defined pension benefits in excess of qualified plan limits imposed by U.S. federal tax law. Information for the SERPs was as follows for the years ended December 31:        Non-Qualified SERPs   (In millions)        2011             2010       Benefit obligations:      Beginning of year    $ 165      $ 182    Service cost      1        1    Interest cost      8        10    Actuarial gain (losses)      23        (2 )  Benefits paid      (2 )      (2 )  Settlements      (22 )      (24 )                   End of year    $ 173      $ 165                     Accrued benefit expense:      Funded status (plan assets less benefit obligations)    $ (173 )    $ (165 )                   Net accrued benefit expense    $ (173 )    $ (165 )                   Amounts recognized in our consolidated statement of condition as of December 31:      Current liabilities    $ (27 )    $ (27 )  Non-current liabilities      (146 )      (138 )                   Net accrued amount recognized in our consolidated statement of condition    $ (173 )    $ (165 )                   Amounts recognized in accumulated other comprehensive income:      Net loss    $ (58 )    $ (45 )                   Accumulated other comprehensive loss      (58 )      (45 )  Cumulative employer contributions in excess of net periodic benefit cost      (115 )      (120 )                   Net obligation recognized in our consolidated statement of condition    $ (173 )    $ (165 )                   Accumulated benefit obligation    $ 173      $ 165    Actuarial assumptions:      Assumptions used to determine benefit obligations and periodic benefit costs are consistent with those noted for the post-retirement plan, with the following exceptions:      Rate of increase for future compensation—SERPs      —        4.75 %  Rate of increase for future compensation—Executive SERPs      10.00 %      10.00    For those defined benefit plans that have accumulated benefit obligations in excess of plan assets as of December 31, 2011 and 2010, the accumulated benefit obligations are $960 million and $231 million, respectively, and the plan assets are $671 million and $36 million, respectively. For those defined benefit plans that have projected benefit obligations in excess of plan assets as of December 31, 2011 and 2010, the projected benefit obligations are $981 million and $263 million, respectively, and the plan assets are $674 million and $50 million, respectively. If trend rates for health care costs were increased by 1%, the post-retirement benefit obligation as of December 31, 2011 would have increased 7%, and the aggregate expense for service and interest costs for 2011 would have increased 10%. Conversely, if trend rates for health care costs were decreased by 1%, the post-retirement benefit obligation as of December 31, 2011 would have decreased 6%, and the aggregate expense for service and interest costs for 2011 would have decreased 9%.   The following table presents the actuarially determined expense for our U.S. and non-U.S. defined benefit plans, post-retirement plan and SERPs for the years ended December 31:        Primary U.S. and Non-U.S.     Post-Retirement        Defined Benefit Plans     Plan   (In millions)    2011     2010     2009     2011     2010     2009   Components of net periodic benefit cost:              Service cost    $ 9      $ 11      $ 13      $ 6      $ 5      $ 4    Interest cost      47        44        45        6        6        6    Assumed return on plan assets      (58 )      (55 )      (56 )      —          —          —      Amortization of net loss      12        7        6        1        2        1                                                     Net periodic benefit cost      10        7        8        13        13        11    Settlements      —          —          (1 )      —          —          —      Curtailments      —          —          (1 )      —          —          —      Special termination benefits      —          —          —          —          —          1                                                     Total expense    $ 10      $ 7      $ 6      $ 13      $ 13      $ 12                                                     Estimated amounts that will be amortized from accumulated other comprehensive income over the next fiscal year:              Net loss    $ (17 )    $ (13 )    $ (7 )    $ (1 )    $ (2 )    $ (2 )                                                   Estimated amortization    $ (17 )    $ (13 )    $ (7 )    $ (1 )    $ (2 )    $ (2 )                                                        Non-Qualified SERPs   (In millions)      2011         2010         2009     Components of net periodic benefit cost:        Service cost    $ 1      $ 1      $ 2    Interest cost      8        10        10    Amortization of net loss      3        5        3                             Net periodic benefit cost      12        16        15    Settlements      7        8        4                             Total expense    $ 19      $ 24      $ 19                             Estimated amounts that will be amortized from accumulated other comprehensive income over the next fiscal year:        Net loss    $ (5 )    $ (3 )    $ (5 )                           Estimated amortization    $ (5 )    $ (3 )    $ (5 )                           Certain of our U.S. employees are eligible to contribute a portion of their pre-tax salary to a 401(k) savings plan, or post-tax Roth contributions, or both, up to the annual IRS limit. Our matching portion of these contributions is paid in cash, and the related compensation and employee benefits expense recorded in our consolidated statement of income was $77 million, $71 million and $73 million for the years ended December 31, 2011, 2010 and 2009, respectively. In addition, employees in certain non-U.S. offices participate in other local plans. Expenses related to these plans were $65 million for the year ended December 31, 2011 and $45 million for each of the years ended December 31, 2010, and 2009. We have a defined contribution supplemental executive retirement plan, referred to as a DC SERP, which provides for a discretionary contribution of cash and/or equity to certain executive officers. The amount is subject to certain vesting requirements as provided in the plan. We recorded compensation and employee benefits expense of $10 million for each of the years ended December 31, 2011, 2010, and 2009 in our consolidated statement of income related to this DC SERP. Shares of common stock and interest in the savings plan may be acquired by eligible employees through the Employee Stock Ownership Plan, referred to as an ESOP. The ESOP is a non-leveraged plan. Employee benefits expense is equal to the contribution called for by the plan formula and is composed of the cash contributed for the purchase of common stock on the open market or the fair value of the shares contributed from treasury stock. Dividends on shares held by the ESOP are charged to retained earnings, and shares are treated as outstanding for the calculation of earnings per common share.

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Occupancy Expense And Information Systems And Communications Expense	12 Months Ended
Dec. 31, 2011
Occupancy Expense And Information Systems And Communications Expense [Abstract]
Occupancy Expense And Information Systems And Communications Expense	Note 19.    Occupancy Expense and Information Systems and Communications Expense Occupancy expense and information systems and communications expense include expense for depreciation of buildings, leasehold improvements, computers, equipment and furniture and fixtures. Total depreciation expense for the years ended December 31, 2011, 2010 and 2009 was $368 million, $373 million and $380 million, respectively. We lease 1,025,000 square feet at One Lincoln Street, our headquarters building located in Boston, Massachusetts, and a related 366,000-square-foot underground parking garage, under 20-year, non-cancelable capital leases expiring in September 2023. A portion of the lease payments is offset by subleases for 153,390 square feet of the building. In addition, we lease approximately 362,000 square feet at 20 Churchill Place, an office building located in the U.K., under a 20-year capital lease expiring in December 2028, with the option to cancel the lease after the first 15 years. As of December 31, 2011 and 2010, an aggregate net book value of $565 million and $606 million, respectively, related to the above-described capital leases was recorded in premises and equipment, with the related liability recorded in long-term debt in our consolidated statement of condition. Capital lease asset amortization is recorded in occupancy expense in our consolidated statement of income over the respective lease term. Lease payments are recorded as a reduction of the liability, with a portion recorded as imputed interest expense. For the years ended December 31, 2011, 2010 and 2009, interest expense related to these capital lease obligations, reflected in net interest revenue, was $43 million, $44 million and $47 million, respectively. As of December 31, 2011 and 2010, accumulated amortization of capital lease assets was $273 million and $230 million, respectively. We have entered into non-cancelable operating leases for premises and equipment. Nearly all of these leases include renewal options. Costs related to operating leases for office space are recorded in occupancy expense. Costs related to operating leases for computers and equipment are recorded in information systems and communications expense. Total rental expense, net of sublease revenue, amounted to $232 million, $241 million and $230 million for the years ended December 31, 2011, 2010 and 2009, respectively. Total rental expense was reduced by sublease revenue of $12 million for the years ended December 31, 2011 and 2010 and $17 million for the year ended December 31, 2009. The following table presents a summary of future minimum lease payments under non-cancelable capital and operating leases as of December 31, 2011. Aggregate future minimum rental commitments have been reduced by aggregate sublease rental commitments of $32 million for capital leases and $19 million for operating leases.   (In millions)    Capital Leases     Operating Leases      Total   2012    $ 68      $ 237       $ 305    2013      68        207         275    2014      68        182         250    2015      67        132         199    2016      71        96         167    Thereafter      647        275         922                              Total minimum lease payments      989      $ 1,129       $ 2,118                        Less amount representing interest payments      (327 )                     Present value of minimum lease payments    $ 662

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Acquisition And Restructuring Costs	12 Months Ended
Dec. 31, 2011
Acquisition And Restructuring Costs [Abstract]
Acquisition And Restructuring Costs	Note 20. Acquisition and Restructuring Costs The following table presents acquisition and restructuring costs incurred during the years ended December 31:   (In millions)    2011      2010      2009   Acquisition costs    $ 16       $ 89       $ 49    Restructuring charges      253         156         —                                 Total    $ 269       $ 245       $ 49                               Acquisition Costs: The acquisition costs incurred in 2011 were composed of $71 million of integration costs incurred primarily in connection with our acquisitions of BIAM, the Intesa securities services business and MIFA. These costs were offset by a $55 million tax indemnification benefit for an income tax claim related to the 2010 acquisition of the Intesa securities services business. Refer to note 2 for additional information with respect to this tax indemnification. The 2010 costs were composed of integration costs primarily associated with the acquisitions of the Intesa securities services business and MIFA. Restructuring Charges: The restructuring charges of $253 million incurred in 2011, more fully described below, included $133 million related to the business operations and information technology transformation program and $120 million related to expense control measures. Business Operations and Information Technology Transformation Program In November 2010, we announced a global multi-year business operations and information technology transformation program. The program includes operational, information technology and targeted cost initiatives, including plans related to reductions in both staff and occupancy costs. To date, we have recorded aggregate pre-tax restructuring charges of $289 million, composed of $133 million in 2011 and $156 million in 2010. The charges related to the program include costs associated with severance, benefits and outplacement services, as well as costs which resulted from actions taken to reduce our occupancy costs through consolidation of real estate. In addition, the charges include costs related to information technology, including transition fees associated with the expansion of our use of service providers associated with components of our information technology infrastructure and application maintenance and support. In 2010, in connection with the program, we initiated a reduction of 1,400 employees, or approximately 5% of our global workforce, which was substantially completed at the end of 2011. In addition, in the third quarter of 2011, in connection with the expansion of our use of service providers associated with our information technology infrastructure and application maintenance and support, we identified 530 employees who will be provided with severance and outplacement services as their roles are eliminated. As of December 31, 2011, in connection with the planned aggregate staff reductions of 1,930 employees described above, 1,332 employees had been involuntarily terminated and left State Street, including 782 employees in 2011. Expense Control Measures During the fourth quarter of 2011, in connection with expense control measures designed to calibrate our expenses to our outlook for our capital markets-facing businesses in 2012, we took two actions. First, we withdrew from our fixed-income trading initiative, under which we traded in fixed-income securities and derivatives as principal with our custody clients and other third-parties that trade in these securities and derivatives. Second, we undertook other targeted staff reductions. As a result of these actions, we recorded restructuring charges of $120 million in our 2011 consolidated statement of income.   The charges included costs related to severance, benefits and outplacement services related to both the withdrawal from the fixed-income initiative and the other targeted staff reductions. In addition, the charges included costs associated with fair- value adjustments to the initiative's trading portfolio resulting from our decision to withdraw from the initiative, and costs related to other asset write-downs and contract terminations. In connection with the employee-related actions, we identified 442 employees who will be provided with severance and outplacement services as their roles are eliminated. As of December 31, 2011, 15 employees had been involuntarily terminated and left State Street, and an additional 184 employees were involuntarily terminated and left State Street in January 2012. The following table presents aggregate activity associated with accruals that resulted from the charges associated with the business operations and information technology transformation program and expense control measures, for the years indicated: (In millions)    Employee- Related Costs     Real Estate Consolidation     Information Technology Costs     Fixed-Income Trading Portfolio      Asset and Other Write- offs     Total   Initial restructuring-related accrual    $ 105      $ 51             $ 156    Payments      (15 )      (4 )             (19 )                                                    Balance at December 31, 2010      90        47               137    Additional accruals for business operations and information technology transformation program      85        7      $ 41             133    Accruals for expense control measures      62        —          —        $ 38       $ 20        120    Payments and adjustments      (75 )      (15 )      (8 )      —           (5 )      (103 )                                                    Balance at December 31, 2011    $ 162      $ 39      $ 33      $ 38       $ 15      $ 287

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Other Expenses	12 Months Ended
Dec. 31, 2011
Other Expenses [Abstract]
Other Expenses	Note 21.    Other Expenses In 2010, we recorded an aggregate pre-tax charge of $414 million, including associated legal costs of $9 million, in our consolidated statement of income with respect to the cash collateral pools underlying SSgA-managed investment funds engaged in securities lending, as well as the cash collateral pools underlying our agency lending program. In connection with the charge, we made a one-time cash contribution of $330 million to the cash collateral pools and liquidating trusts underlying the SSgA lending funds. In light of our assessment with respect to previously disclosed asserted and unasserted claims and our evaluation of the ultimate resolution of such claims, as well as the effect of the redemption restrictions originally imposed by SSgA on the lending funds and other considerations, we elected to make the cash contribution, which restored the net asset value per unit of the underlying cash collateral pools to $1.00 as of June 30, 2010. As a result of this action, SSgA removed the redemption restrictions from the SSgA lending funds in August 2010. The pre-tax charge also included the establishment of a $75 million reserve to address potential inconsistencies in connection with our implementation of the redemption restrictions applicable to the collateral pools underlying our agency lending program. This charge was based on the results of a review of our implementation of the redemption restrictions with respect to participants in the agency lending collateral pools, and our assessment of the amount required to compensate clients for the dilutive effect of redemptions which may not have been consistent with the intent of the policy. In May 2011, we distributed substantially all of the reserve to "net providers" of liquidity in such pools, equal to the estimated excess liquidity used by "net consumers" of liquidity in those pools.   In 2009, the Staff of the SEC provided State Street Bank with a "Wells" notice related to the SEC's ongoing investigation into disclosures and management by SSgA of certain of its active fixed-income strategies during 2007 and prior periods. Subsequent to the receipt of the Wells notice, we engaged in discussions with the SEC and other governmental and regulatory authorities regarding a potential settlement of this matter. Based on such discussions in 2009, we determined it appropriate to increase our reserve, initially established in 2007 to address litigation exposure and other costs associated with SSgA's management of these fixed-income strategies, by $250 million, to take into account such a potential settlement with these governmental authorities and the other ongoing litigation related to the active fixed-income strategies. As a result, we recorded a provision of $250 million in our 2009 consolidated statement of income related to our estimate of this legal exposure. We settled regulatory inquiries related to this exposure in 2010.

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Income Taxes	12 Months Ended
Dec. 31, 2011
Income Taxes [Abstract]
Income Taxes	Note 22. Income Taxes The following table presents the components of income tax expense for the years ended December 31:   (In millions)    2011      2010     2009   Current:         Federal    $ 49       $ (885 )    $ 75    State      54         15        39    Non-U.S.      295         156        157                              Total current expense (benefit)      398         (714 )      271    Deferred:         Federal      134         745        383    State      8         141        28    Non-U.S.      76         358        40                        Total deferred expense      218         1,244        451    Total income tax expense    $ 616       $ 530      $ 722                        The amounts for 2011 presented in the table included income tax expense of $55 million associated with an indemnification benefit for an income tax claim related to the 2010 acquisition of the Intesa securities services business (refer to note 2). The amounts for 2009 presented in the table excluded an income tax benefit of $2.41 billion associated with the extraordinary loss recorded in connection with the conduit consolidation. Amounts of income tax expense (benefit) related to net gains (losses) from sales of investment securities were $55 million, $(98) million and $147 million for 2011, 2010 and 2009, respectively. Pre-tax income attributable to our operations located outside the U.S. was $1.70 billion, $1.34 billion and $801 million for 2011, 2010 and 2009, respectively. Pre-tax earnings of our non-U.S. subsidiaries are subject to U.S. income tax when effectively repatriated. As of December 31, 2011, we have chosen to indefinitely reinvest $2.2 billion of the retained earnings of certain of our non-U.S. subsidiaries. No provision has been recorded for U.S. income taxes that could be incurred upon repatriation, and determining the tax liability that could be incurred upon repatriation is not practicable.   The following table presents significant components of deferred tax liabilities and assets as of December 31: (In millions)    2011     2010   Deferred tax liabilities:      Lease financing transactions    $ 397      $ 463    Fixed and intangible assets      1,067        1,029    Other      21        122                     Total deferred tax liabilities    $ 1,485      $ 1,614                     Deferred tax assets:      Foreign currency translation    $ 2      $ 70    Unrealized losses on securities, net      651        1,083    Deferred compensation      162        183    Defined benefit pension plan      180        121    Expenses      141        177    Real estate      28        33    Other      104        137                     Total deferred tax assets      1,268        1,804                     Valuation allowance for deferred tax assets      (19 )      (18 )                   Deferred tax assets net of valuation allowance    $ 1,249      $ 1,786                     Management considers the valuation allowance adequate to reduce the total deferred tax assets to an aggregate amount that will more likely than not be realized. Management has determined that a valuation allowance is not required for the remaining deferred tax assets because it is more likely than not that there is sufficient taxable income of the appropriate nature within the carryback and carryforward periods to realize these assets. As of December 31, 2011 and 2010, we had deferred tax assets associated with non-U.S. and state loss carryforwards of $34 million and $26 million, respectively, included in "other" in the above table. Loss carryforwards expire in 2012 through 2031. The following table presents a reconciliation of the U.S. statutory income tax rate to the effective tax rate based on income before income tax expense, excluding the aforementioned extraordinary loss for 2009, for the years ended December 31:        2011     2010     2009   U.S. federal income tax rate      35.0 %      35.0 %      35.0 %  Changes from statutory rate:        State taxes, net of federal benefit      2.0        1.2        1.7    Tax-exempt income      (2.9 )      (3.6 )      (3.1 )  Tax credits      (1.5 )      (1.3 )      (1.6 )  Foreign tax differential      (4.3 )      (3.6 )      (5.0 )  Transactions related to investment securities (1)      (4.1 )      (2.3 )      —      Non-deductible penalty      —          —          1.0    Other, net      .1        —          .6                             Effective tax rate      24.3 %      25.4 %      28.6 %                           (1)  Amounts for both years represented the effect of discrete tax benefits related to the cost to terminate funding obligations that supported former conduit asset structures; the amount for 2010 also included the partial write-off of a deferred tax asset associated with certain of the investment securities sold in connection with our December 2010 investment portfolio repositioning.   The following table presents activity related to unrecognized tax benefits as of December 31:   (In millions)    2011     2010   Balance at beginning of year    $ 446      $ 386    Increase (Decrease) related to agreements with tax authorities      (322 )      27    Increase related to tax positions taken during current year      1        33                     Balance at end of year    $ 125      $ 446                     The balance as of December 31, 2011 presented in the table included $112 million of tax positions considered highly certain to ultimately result in tax deductions or credits, but for which the timing of such deductions or credits is uncertain. It is reasonably possible that unrecognized tax benefits will decrease by up to $44 million over the next 12 months as a result of amendments of state tax filings consistent with our agreement with the IRS to close their review of the tax years 2000—2006. Refer to note 10 for additional information about the agreement. We record interest and penalties related to income taxes as a component of income tax expense. Income tax expense for 2011 and 2009 included related interest and penalties of approximately $10 million and $3 million, respectively. Income tax expense for 2010 included no interest and penalties. We had recorded accrued interest of approximately $8 million and $65 million as of December 31, 2011 and 2010, respectively. We are presently under audit by a number of tax authorities. The earliest tax year open to examination in jurisdictions where we have material operations is 2007. Management believes that we have sufficient accrued liabilities as of December 31, 2011 for tax exposures and related interest expense.

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Earnings Per Common Share	12 Months Ended
Dec. 31, 2011
Earnings Per Common Share [Abstract]
Earnings Per Common Share	Note 23.     Earnings Per Common Share The following table presents the computation of basic and diluted earnings per common share for the years ended December 31:   (Dollars in millions, except per share amounts)    2011     2010     2009   Net income before extraordinary loss    $ 1,920      $ 1,556      $ 1,803    Less:        Prepayment and accretion of preferred stock discount      —        —        (117 )  Preferred stock dividends      (20 )      —        (46 )  Dividends and undistributed earnings allocated to participating securities(1)      (18 )      (16 )      —                             Net income before extraordinary loss available to common shareholders    $ 1,882      $ 1,540      $ 1,640                             Average shares outstanding (in thousands):        Basic average shares      492,598        495,394        470,602    Effect of dilutive securities: stock options and stock awards      3,474        2,530        3,401                             Diluted average shares      496,072        497,924        474,003                             Anti-dilutive securities(2)      2,382        10,316        12,904    Earnings per common share before extraordinary loss:        Basic    $ 3.82      $ 3.11      $ 3.50    Diluted(3)      3.79        3.09        3.46    (1)  Represented the portion of net income available to common equity allocated to participating securities; participating securities, composed of unvested restricted stock and director stock, have non-forfeitable rights to dividends during the vesting period on a basis equivalent to dividends paid to common shareholders.   (2) Represented stock options, restricted stock and other securities outstanding but not included in the computation of diluted average shares because their effect was anti-dilutive.   (3) Calculations for 2011 and 2010 reflected the allocation of earnings to participating securities using the two-class method, as this computation was more dilutive than the calculation using the treasury stock method.

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Line Of Business Information	12 Months Ended
Dec. 31, 2011
Line Of Business Information [Abstract]
Line Of Business Information	Note 24.     Line of Business Information We have two lines of business: Investment Servicing and Investment Management. Given our services and management organization, the results of operations for these lines of business are not necessarily comparable with those of other companies, including companies in the financial services industry. Investment Servicing provides services for U.S. mutual funds, collective investment funds and other investment pools, corporate and public retirement plans, insurance companies, foundations and endowments worldwide. Products include custody, product-and-participant-level accounting, daily pricing and administration; master trust and master custody; recordkeeping; foreign exchange, brokerage and other trading services; securities finance; deposit and short-term investment facilities; loans and lease financing; investment manager and alternative investment manager operations outsourcing; and performance, risk and compliance analytics to support institutional investors. We provide shareholder services, which include mutual fund and collective investment fund shareholder accounting, through 50%-owned affiliates, Boston Financial Data Services, Inc. and the International Financial Data Services group of companies. Investment Management, through SSgA, provides a broad range of investment management strategies, specialized investment management advisory services and other financial services, such as securities finance, for corporations, public funds, and other sophisticated investors. Management strategies offered by SSgA include passive and active, such as enhanced indexing and hedge fund strategies, using quantitative and fundamental methods for both U.S. and non-U.S. equity and fixed-income securities. SSgA also offers exchange-traded funds. Our investment servicing strategy is to focus on total client relationships and the full integration of our products and services across our client base through cross-selling opportunities. In general, a client will use a combination of services, depending on their needs, rather than one product or service. For instance, a custody client may purchase securities finance and cash management services from different business units. Products and services that we provide to our clients are parts of an integrated offering to these clients. We price our products and services on the basis of overall client relationships and other factors; as a result, revenue may not necessarily reflect the stand-alone market price of these products and services within the business lines in the same way it would for independent business entities. Generally, approximately two-thirds of our consolidated total revenue (fee revenue from investment servicing and investment management, as well as trading services and securities finance activities) is generated by these two business lines. The remaining one-third is composed of processing and other fee revenue, net interest revenue, which is largely generated by the investment of client deposits in a variety of assets, and net gains (losses) related to investment securities. These other revenue types are generally fully allocated to, or reside in, Investment Servicing and Investment Management. Revenue and expenses are directly charged or allocated to the lines of business through management information systems. Assets and liabilities are allocated according to policies that support management's strategic and tactical goals. Capital is allocated based on risk-weighted assets and management's judgment. Capital allocations may not be representative of the capital that might be required if these lines of business were independent business entities. The following is a summary of our line of business results. The "Other" column for 2011 represented integration costs associated with acquisitions and restructuring charges associated with our business operations and information technology transformation program ($133 million) and expense control measures ($120 million), more fully described in note 20. The "Other" column for 2010 represented the net loss from sales of investment securities associated with the December 2010 investment portfolio repositioning, more fully described in note 3, and restructuring charges associated with our business operations and information technology transformation program and integration costs associated with acquisitions, both more fully described in note 20. The amounts presented in the "Other" column for 2009 represented net interest revenue earned in connection with our participation in the Federal Reserve's AMLF and integration costs recorded in connection with our 2007 acquisition of Investors Financial. The amounts in the "Other" columns were not allocated to State Street's business lines.   In 2011, management revised its methodology with respect to funds transfer pricing, which is used in the measurement of business unit net interest revenue. Net interest revenue and average assets for 2010 have been restated for comparative purposes to reflect the revised methodology. Amounts for 2009 were not restated.       Investment Servicing     Management Investment     Other     Total   Years ended December 31,   2011     2010     2009     2011     2010     2009     2011     2010     2009     2011     2010     2009   (Dollars in millions, except where otherwise noted)                                                                         Fee revenue:                         Servicing fees   $ 4,382      $ 3,938      $ 3,334                  $ 4,382      $ 3,938      $ 3,334    Management fees     —        —        —      $ 917      $ 829      $ 766              917        829        766    Trading services     1,220        1,106        1,094        —        —        —              1,220        1,106        1,094    Securities finance     333        265        387        45        53        183              378        318        570    Processing fees and other     195        225        72        102        124        99              297        349        171                                                                                  Total fee revenue     6,130        5,534        4,887        1,064        1,006        1,048              7,194        6,540        5,935    Net interest revenue     2,181        2,553        2,489        152        146        68          $ 7        2,333        2,699        2,564    Gains (Losses) related to investment securities, net     67        58        141        —        —        —        $ (344 )      —        67        (286 )      141                                                                                                    Total revenue     8,378        8,145        7,517        1,216        1,152        1,116          (344 )      7        9,594        8,953        8,640    Provision for loan losses     —        25        148        —        —        1          —        —        —        25        149    Expenses from operations     5,889        5,430        4,920        900        753        747          —        —        6,789        6,183        5,667    Securities lending charge     —        75        —        —        339        —          —        —        —        414        —    Provision for fixed-income litigation exposure     —        —        —        —        —        250          —        —        —        —        250    Acquisition costs     —        —        —        —        —        —      $ 16        89        49        16        89        49    Restructuring charges     —        —        —        —        —        —        253        156        —        253        156        —                                                                                                    Total expenses     5,889        5,505        4,920        900        1,092        997        269        245        49        7,058        6,842        5,966                                                                                                    Income from continuing operations before income taxes   $ 2,489      $ 2,615      $ 2,449      $ 316      $ 60      $ 118      $ (269 )    $ (589 )    $ (42 )    $ 2,536      $ 2,086      $ 2,525                                                                                                    Pre-tax margin     30 %      32 %      33 %      26 %      5 %      11 %            26 %      23 %      29 %  Average assets (in billions)   $ 169.4      $ 146.9      $ 143.7      $ 5.4      $ 5.1      $ 3.1            $ 174.8      $ 152.0      $ 146.8

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Non-U.S. Activities	12 Months Ended
Dec. 31, 2011
Non-U.S. Activities [Abstract]
Non-U.S. Activities	Note 25.     Non-U.S. Activities We define our non-U.S. activities as those revenue-producing assets and business activities that arise from clients domiciled outside the U.S. Due to the nature of our business, precise segregation of our U.S. and non-U.S. activities is not possible. Subjective judgments have been applied to determine results of operations related to our non-U.S. activities, including our application of funds transfer pricing and our asset and liability management policies. Interest expense allocations are based on the average cost of short-term borrowings. The following table presents our non-U.S. financial results for the years ended December 31. Effective January 1, 2011, management revised its methodology with respect to funds transfer pricing, which is used in the measurement of net interest revenue related to non-U.S. activities. Prior-year net interest revenue amounts were not restated to reflect the revised methodology. (In millions)    2011     2010      2009   Total fee revenue    $ 3,004      $ 2,661       $ 2,291    Net interest revenue      1,104        725         422    Gains (Losses) related to investment securities, net      (25 )      449         (37 )                            Total revenue      4,083        3,835         2,676    Expenses      3,415        2,962         2,457                              Income before income taxes      668        873         219    Income tax expense      172        327         84                              Net income    $ 496      $ 546       $ 135                              Non-U.S. revenue for 2011 and 2010 included $1.04 billion and $1.18 billion, respectively, in the U.K., primarily from our London operations.   The following table presents the significant components of our non-U.S. assets as of December 31, based on the domicile of the underlying counterparties: (In millions)      2011         2010    Interest-bearing deposits with banks    $ 10,772       $ 9,443    Non-U.S. investment securities      25,376         19,329    Other assets      15,518         13,994                      Total assets    $ 51,666       $ 42,766

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Parent Company Financial Statements	12 Months Ended
Dec. 31, 2011
Parent Company Financial Statements [Abstract]
Parent Company Financial Statements	Note 26. Parent Company Financial Statements The following tables present the financial statements of the parent company without consolidation of its banking and non-banking subsidiaries, as of and for the years ended December 31: STATEMENT OF INCOME   Years ended December 31,    2011     2010     2009   (In millions)                    Cash dividends from consolidated banking subsidiary      $ 1,400      $ 250    Cash dividends from consolidated non-banking subsidiaries and unconsolidated entities    $ 60        100        25    Other, net      34        9        (11 )                           Total revenue      94        1,509        264    Interest expense      203        162        178    Other expenses      60        421        53                             Total expenses      263        583        231    Income tax benefit      (125 )      (93 )      (38 )                           Income (Loss) before equity in undistributed income of consolidated subsidiaries and unconsolidated entities      (44 )      1,019        71    Extraordinary loss, net of taxes      —          —          (20 )  Equity in undistributed income (loss) of consolidated subsidiaries and unconsolidated entities:        Consolidated banking subsidiary      1,773        484        (1,987 )  Consolidated non-banking subsidiaries and unconsolidated entities      191        53        55                             Net income (loss)    $ 1,920      $ 1,556      $ (1,881 )                             STATEMENT OF CONDITION   As of December 31,    2011      2010   (In millions)               Assets:       Interest-bearing deposits with consolidated banking subsidiary    $ 4,914       $ 5,058    Trading account assets      138         122    Investment securities available for sale      25         24    Investments in subsidiaries:       Consolidated banking subsidiary      18,724         16,697    Consolidated non-banking subsidiaries      2,340         2,299    Unconsolidated entities      326         297    Notes and other receivables from:       Consolidated banking subsidiary      618         —      Consolidated non-banking subsidiaries and unconsolidated entities      302         283    Other assets      994         850    Total assets    $ 28,381       $ 25,630                      Liabilities:       Commercial paper    $ 2,384       $ 2,799    Accrued taxes, expenses and other liabilities due to:       Consolidated banking subsidiary      —           561    Third parties      276         161    Long-term debt      6,323         4,322                      Total liabilities      8,983         7,843    Shareholders' equity      19,398         17,787                      Total liabilities and shareholders' equity    $ 28,381       $ 25,630                      STATEMENT OF CASH FLOWS   Years ended December 31,    2011     2010     2009   (In millions)                    Net cash (used in) provided by operating activities    $ (571 )    $ 1,453      $ (24 )  Investing Activities:        Net (increase) decrease in interest-bearing deposits with banking subsidiary      144        (831 )      (1,457 )  Proceeds from sales and maturities of available-for-sale securities      —        1        36    Net decrease in securities related to AMLF      —        —        3,104    Investments in non-banking subsidiaries and unconsolidated entities      (648 )      (277 )      (776 )  Sale of investment in non-banking subsidiaries and unconsolidated entities      39        127        —    Business acquisitions      (51 )      (141 )      —                             Net cash (used in) provided by investing activities      (516 )      (1,121 )      907    Financing Activities:        Net decrease in short-term borrowings related to AMLF      —        —        (3,063 )  Net (decrease) increase in commercial paper      (415 )      22        189    Proceeds from issuance of long-term debt, net of issuance costs      1,986        —        1,992    Payments for long-term debt      —        (300 )      —    Proceeds from issuance of preferred stock      500        —        —    Redemption of TARP preferred stock      —        —        (2,000 )  Proceeds from public offering of common stock, net of issuance costs      —        —        2,231    Repurchase of TARP common stock warrant      —        —        (60 )  Purchases of common stock      (675 )      —        —    Proceeds from exercises of common stock options      40        10        34    Repurchases of common stock for employee tax withholding      (63 )      (44 )      (38 )  Proceeds from issuances of treasury stock for common stock awards and option exercises      9        —        —    Payments for cash dividends      (295 )      (20 )      (168 )                           Net cash provided by (used in) financing activities      1,087        (332 )      (883 )                           Net change      —        —        —    Cash and due from banks at beginning of year      —        —        —                             Cash and due from banks at end of year    $ —      $ —      $ —

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Summary Of Significant Accounting Policies (Policy)	12 Months Ended
Dec. 31, 2011
Summary Of Significant Accounting Policies [Abstract]
Basis Of Presentation	Basis of Presentation: Our consolidated financial statements include the accounts of the parent company and its majority- and wholly-owned subsidiaries, including State Street Bank. All material inter-company transactions and balances have been eliminated. Certain previously reported amounts have been reclassified to conform to current year presentation. We consolidate subsidiaries in which we hold a majority of the voting rights or exercise control. Investments in unconsolidated subsidiaries, recorded in other assets, generally are accounted for under the equity method of accounting if we have the ability to exercise significant influence over the operations of the investee. For investments accounted for under the equity method, our share of income or loss is recorded in processing fees and other revenue in our consolidated statement of income. Investments not meeting the criteria for equity method treatment are accounted for under the cost method of accounting.
Foreign Currency Translation	Foreign Currency Translation: The assets and liabilities of our operations with functional currencies other than the U.S. dollar are translated at month- end exchange rates, and revenues and expenses are translated at rates that approximate average monthly exchange rates. Gains or losses from the translation of the net assets of subsidiaries with functional currencies other than the U.S. dollar, net of related taxes, are recorded in accumulated other comprehensive income, a component of shareholders' equity.
Cash And Cash Equivalents	Cash and Cash Equivalents: For purposes of the consolidated statement of cash flows, cash and cash equivalents are defined as cash and due from banks.
Interest-Bearing Deposits With Banks	Interest-bearing Deposits with Banks: Interest-bearing deposits with banks generally consist of highly liquid, short-term investments maintained at the Federal Reserve Bank and other central banks with original maturities at the time of purchase of one month or less.
Securities Purchased Under Resale Agreements And Securities Sold Under Repurchase Agreements	Securities Purchased Under Resale Agreements and Securities Sold Under Repurchase Agreements: U.S. Treasury and federal agency securities, referred to as "U.S. government securities," purchased under resale agreements or sold under repurchase agreements are treated as collateralized financing transactions, and are recorded in our consolidated statement of condition at the amounts at which the securities will be subsequently resold or repurchased, plus accrued interest. Our policy is to take possession or control of securities underlying resale agreements, allowing borrowers the right of collateral substitution and/or short-notice termination. We revalue these securities daily to determine if additional collateral is necessary from the borrower to protect us against credit exposure. We can use these securities as collateral for repurchase agreements. For securities sold under repurchase agreements collateralized by our U.S. government securities portfolio, the dollar value of the U.S. government securities remains in investment securities in our consolidated statement of condition. Where a master netting agreement exists or both parties are members of a common clearing organization, resale and repurchase agreements with the same counterparty or clearing house and maturity date are reported on a net basis.
Investment Securities	Investment Securities: Investment securities held by us are classified as either trading account assets, investment securities available for sale or investment securities held to maturity at the time of purchase, based on management's intent. Trading account assets are debt and equity securities purchased in connection with our trading activities and, as such, are expected to be sold in the near term. Our trading activities typically involve active and frequent buying and selling with the objective of generating profits on short-term movements. Securities available for sale are those that we intend to hold for an indefinite period of time. Available-for-sale securities include securities utilized as part of our asset and liability management activities that may be sold in response to changes in interest rates, prepayment risk, liquidity needs or other factors. Securities held to maturity are debt securities that management has the intent and the ability to hold to maturity. Trading account assets are carried at fair value. Both realized and unrealized gains and losses on trading account assets are recorded in trading services revenue in our consolidated statement of income. Debt and marketable equity securities classified as available for sale are carried at fair value, and after-tax net unrealized gains and losses are recorded in accumulated other comprehensive income. Gains or losses realized on sales of available-for-sale securities are computed using the specific identification method and are recorded in gains related to investment securities, net, in our consolidated statement of income. Securities held to maturity are carried at cost, adjusted for amortization of premiums and accretion of discounts. We review the fair values of debt securities at least quarterly, and evaluate individual securities for impairment that may be deemed to be other than temporary. For impaired securities that we plan to sell, or when it is more likely than not that we will be forced to sell the security, the impairment is deemed to be other than temporary and the security is written down to its fair value. Otherwise, we determine whether or not we expect to recover the entire amortized cost basis of the security, primarily by comparing the present value of expected future principal, interest and other contractual cash flows to the security's amortized cost basis. Our evaluation of impairment of mortgage- and asset-backed securities incorporates detailed information with respect to underlying loan-level performance. Accordingly, the range of estimates pertaining to each collateral type reflects the unique characteristics of the underlying loans, such as payment options and collateral geography, among other factors.   When we conclude that other-than-temporary impairment exists and we have no intention to sell, or will not be forced to sell, the security, the impairment is separated into the amount related to credit losses and the amount related to factors other than credit. The amount related to credit losses is recognized in our consolidated statement of income in gains (losses) related to investment securities, net, and the amortized cost basis of the security is written down by this amount. The portion of impairment related to all other factors is recognized in other comprehensive income. Interest revenue related to debt securities is recognized in our consolidated statement of income using the interest method, or on a basis approximating a level rate of return over the contractual or estimated life of the security. The level rate of return considers any nonrefundable fees or costs, as well as purchase premiums or discounts, resulting in amortization or accretion, accordingly. With respect to debt securities acquired, for those which we consider it probable as of the date of acquisition that we will be unable to collect all contractually required principal, interest and other payments, the excess of our estimate of undiscounted future cash flows from these securities over their initial recorded investment is accreted into interest revenue on a level-yield basis over the securities' estimated remaining terms. Subsequent decreases in these securities' expected future cash flows are either recognized prospectively through an adjustment of the yields on the securities over their remaining terms, or are evaluated for other-than-temporary impairment as described above. Increases in expected future cash flows are recognized prospectively over the securities' estimated remaining terms through the recalculation of their yields. With respect to certain debt securities acquired which are considered to be beneficial interests in securitized financial assets, the excess of our estimate of undiscounted future cash flows from these securities over their initial recorded investment is accreted into interest revenue on a level-yield basis over the securities' estimated remaining terms. Subsequent decreases in these securities' expected future cash flows are either recognized prospectively through an adjustment of the yields on the securities over their remaining terms, or are evaluated for other-than-temporary impairment as described above. Increases in expected future cash flows are recognized prospectively over the securities' estimated remaining terms through the recalculation of their yields.
Loans And Leases	Loans and Leases: Loans generally are recorded at their principal amount outstanding, net of the allowance for loan losses, unearned income, and any net unamortized deferred loan origination fees. Acquired loans are recorded at fair value, based on management's expectation with respect to future principal and interest collection as of the date of acquisition. Loans acquired with evidence of deterioration in credit quality subsequent to origination, and for which our inability to collect all contractually required payments is probable on the date of acquisition, are recorded at fair value. The excess of expected future cash flows from these loans over their initial recorded investment is accreted into interest revenue on a level- yield basis over the remaining life of the loans. The carrying amount of acquired loans is assessed on an ongoing basis using a discounted cash flow model, which incorporates management expectations of prepayments. Subsequent decreases in expected cash flows result in an addition to the related allowance to allow the loan to maintain its level yield. Increases in expected cash flows are recognized, first, as a reduction of any remaining allowance, and then are recognized prospectively over the remaining life of the loan through a recalculation of the loan's level yield. Interest revenue related to loans is recognized in our consolidated statement of income using the interest method or on a basis approximating a level rate of return over the term of the loan. Fees received for providing loan commitments and letters of credit that we anticipate will result in loans typically are deferred and amortized to interest revenue over the life of the related loan, beginning with the initial borrowing. Fees on commitments and letters of credit are amortized to processing fees and other revenue over the commitment period when funding is not known or expected. For all loan classes, other than loans acquired with evidence of deterioration in credit quality, loans are placed on non- accrual status when they become 60 days past-due as to either principal or interest, or earlier when full collection of principal or interest is not considered probable. Loans 60 days past-due, but considered both well secured and in the process of collection, are treated as exceptions and may be excluded from non-accrual status. When we place a loan on non-accrual status, the accrual of interest is discontinued and previously recorded but unpaid interest is reversed and generally charged against interest revenue. For loans on non-accrual status, revenue is recognized on a cash basis after recovery of principal, if and when interest payments are received. Loans may be removed from non-accrual status when repayment is reasonably assured and performance under the terms of the loan has been demonstrated. In certain circumstances, we restructure troubled loans by granting concessions to borrowers experiencing financial difficulty. Once restructured, the loans are generally considered impaired until their maturity, regardless of whether the borrowers perform under the modified terms of the loans. Leveraged lease investments are reported at the aggregate of lease payments receivable and estimated residual values, net of non-recourse debt and unearned income. Lease residual values are reviewed regularly for other-than-temporary impairment, with valuation adjustments recorded currently against processing fees and other revenue. Unearned income is recognized to yield a level rate of return on the net investment in the leases. Gains and losses on residual values of leased equipment sold are recorded in processing fees and other revenue.
Allowance For Loan Losses	Allowance for Loan Losses: The allowance for loan losses, recorded as a reduction of loans and leases in our consolidated statement of condition, represents management's estimate of probable credit losses inherent in our loan and lease portfolio as of the balance sheet date. The allowance is evaluated on a regular basis by management. Factors considered in evaluating the appropriate level of the allowance for both the institutional and commercial real estate segments of our loan and lease portfolio include previous loss experience, current economic conditions and adverse situations that may affect the borrower's ability to repay, the estimated value of the underlying collateral, if any, the performance of individual credits in relation to contract terms, and other relevant factors. Provisions for loan losses reflect our estimate of the amount necessary to maintain the allowance at a level considered by us to be appropriate to absorb estimated probable credit losses inherent in the loan and lease portfolio. Loans are charged off to the allowance for loan losses in the reporting period in which either an event occurs that confirms the existence of a loss on a loan or a portion of a loan is determined to be uncollectible. In addition, any impaired loan that is determined to be collateral dependent is reduced to an amount equal to the fair value of the collateral less costs to sell. A loan is identified as collateral dependent when management determines that it is probable that the underlying collateral will be the sole source of repayment. Recoveries are recorded as adjustments to the allowance on a cash basis. In addition, we maintain a reserve for off-balance sheet credit exposures that is recorded in other liabilities in our consolidated statement of condition. Factors considered in evaluating the appropriate level of this reserve are similar to those considered with respect to the allowance for loan losses. Provisions to change the level of this reserve are recorded in other expenses in our consolidated statement of income.
Premises And Equipment	Premises and Equipment: Buildings, leasehold improvements, computers, software and other equipment are carried at cost less accumulated depreciation and amortization. Depreciation and amortization, recorded in occupancy expense and information systems and communications expense in our consolidated statement of income, are computed using the straight-line method over the estimated useful lives of the related assets or the remaining terms of the leases, generally three to forty years. Maintenance and repairs are charged to expense as incurred, while major leasehold improvements are capitalized and expensed over their estimated useful lives or the remaining terms of the lease. For premises held under leases for which we have an obligation to restore the facilities to their original condition upon expiration of the lease, we expense the anticipated related costs over the term of the lease. Costs related to internal-use software development projects that provide significant new functionality are capitalized. We consider projects for capitalization that are expected to yield long-term operational benefits, such as applications that result in operational efficiencies and/or incremental revenue streams.
Goodwill And Other Intangible Assets	Goodwill and Other Intangible Assets: Goodwill represents the excess of the cost of an acquisition over the fair value of the net tangible and other intangible assets acquired. Other intangible assets represent purchased assets that can be distinguished from goodwill because of contractual rights or because the asset can be exchanged on its own or in combination with a related contract, asset or liability. Goodwill is not amortized, but is subject to annual evaluation for impairment. Other intangible assets related to customer relationships generally are amortized on a straight-line basis over periods ranging from five to twenty years, and core deposit intangible assets over periods ranging from sixteen to twenty-two years, with amortization recorded in other expenses. Impairment of goodwill is deemed to exist if the carrying value of a reporting unit, including its allocation of goodwill and other intangible assets, exceeds its estimated fair value. Impairment of other intangible assets is deemed to exist if the balance of the other intangible asset exceeds the cumulative expected net cash inflows related to the asset over its remaining estimated useful life. If these reviews determine that goodwill or other intangible assets are impaired, the value of the goodwill or the other intangible asset is written down through a charge to other expenses.
Fee And Net Interest Revenue	Fee and Net Interest Revenue: Fees from investment servicing, investment management, securities finance, trading services and certain types of processing fees and other revenue are recorded in our consolidated statement of income based on estimates or specific contractual terms as transactions occur or services are rendered, provided that persuasive evidence exists, the price to the client is fixed or determinable and collectability is reasonably assured. Amounts accrued at period-end are recorded in accrued income receivable in our consolidated statement of condition. Performance fees from investment management are recorded when earned, based on predetermined benchmarks associated with the applicable fund's performance. Interest revenue on interest-earning assets and interest expense on interest-bearing liabilities are recorded in our consolidated statement of income as components of net interest revenue, and are generally based on the effective yield of the related financial asset or liability.
Employee Benefits Expense	Employee Benefits Expense: Employee benefits expense, recorded in our consolidated statement of income, includes costs of certain pension and other post-retirement benefit plans related to prior and current service, which are accrued on a current basis, as well as contributions associated with defined contribution savings plans, unrestricted cash and stock awards under other employee incentive compensation plans, and the amortization of restricted stock awards.
Equity-Based Compensation	Equity-Based Compensation: We record compensation expense for equity-based awards. Accordingly, we measure compensation expense at fair value on a straight-line basis over the service or performance period, net of estimated forfeitures. The fair values of equity-based awards, such as restricted stock, deferred stock and performance awards, are based on the closing price of our common stock on the date of grant, adjusted if appropriate based upon the award's eligibility to receive dividends. The fair value of stock options and stock appreciation rights is determined using the Black-Scholes valuation model. Compensation expense related to equity-based awards with service-only conditions and terms that provide for a graded vesting schedule are recognized on a straight-line basis over the required service period for the entire award. Compensation expense related to equity-based awards with performance conditions and terms that provide for a graded vesting schedule is recognized over the requisite service period for each separately vesting tranche of the award, and is based on the probable outcome of the performance conditions at each reporting date. The expense is adjusted for assumptions with respect to the estimated amount of awards that will be forfeited prior to vesting, and for employees who have met certain retirement eligibility criteria.   Dividend equivalents for certain equity-based awards are paid on stock units on a current basis prior to vesting and distribution. Compensation expense for common stock and cash awards granted to employees meeting early retirement eligibility criteria is fully expensed and accrued at the grant date.
Income Taxes	Income Taxes: We use an asset and liability approach to account for income taxes. Our objective is to recognize the amount of taxes payable or refundable for the current year through charges or credits to the current tax provision, and to recognize deferred tax assets and liabilities for the future tax consequences resulting from temporary differences between the amounts reported in our consolidated financial statements and their respective tax bases. The measurement of tax assets and liabilities is based on enacted tax laws and applicable tax rates. The effects of a tax position on our consolidated financial statements are recognized when we believe it more likely than not that the position will be sustained. A deferred tax valuation allowance is established if it is considered more likely than not that all or a portion of the deferred tax assets will not be realized. Deferred tax assets and liabilities are netted within the same tax jurisdiction.
Earnings Per Share	Earnings Per Share: Basic earnings per share, or EPS, is calculated pursuant to the "two-class" method, using net income available to common shareholders and the weighted-average number of common shares outstanding during the period. Diluted EPS is calculated pursuant to the two-class method, by dividing net income available to common shareholders by the weighted-average number of common shares outstanding for the period and the shares representing the dilutive effect of common stock options and other equity-based awards. The effect of common stock options and other equity-based awards is excluded from the calculation of diluted EPS in periods in which their effect would be anti-dilutive. The two-class method requires the allocation of undistributed net income between common and participating shareholders. Net income available to common shareholders, presented separately in our consolidated statement of income, is the basis for the calculation of both basic and diluted EPS. Participating securities are composed of unvested restricted stock and director stock awards, which are equity-based awards that contain non-forfeitable rights to dividends, and are considered to participate with common shareholders in undistributed earnings.
Fair Value Measurements	Fair Value Measurements: We carry certain of our financial assets and liabilities at fair value on a recurring basis. These financial assets and liabilities are composed of trading account assets, investment securities available for sale and various types of derivative financial instruments. In addition, we measure certain assets, such as goodwill, investment securities held to maturity and other long-lived assets, at fair value on a non-recurring basis to evaluate those assets for potential impairment. Fair value is defined as the price that would be received to sell an asset or paid to transfer a liability in an orderly transaction between market participants at the measurement date. We categorize our financial assets and liabilities into the following fair value hierarchy: Level 1 – Financial assets and liabilities with values based on unadjusted quoted prices for identical assets or liabilities in an active market. Examples of level 1 financial instruments include active exchange-traded equity securities and certain U.S. government securities. Level 2 – Financial assets and liabilities with values based on quoted prices for similar assets and liabilities in active markets, and inputs that are observable for the asset or liability, either directly or indirectly, for substantially the full term of the asset or liability. Examples of level 2 financial instruments include various types of fixed-income investment securities and interest-rate and foreign exchange derivative instruments. Pricing models are utilized to estimate fair value for certain financial assets and liabilities categorized in level 2.   Level 3 – Financial assets and liabilities with values based on prices or valuation techniques that require inputs that are both unobservable in the market and significant to the overall fair value measurement. These inputs reflect management's judgment about the assumptions that a market participant would use in pricing the asset or liability, and are based on the best available information, some of which is internally developed. Examples of level 3 financial instruments include certain asset- and mortgage-backed securities and certain derivative instruments with little or no market activity and a resulting lack of price transparency. When determining the fair value measurements for financial assets and liabilities carried at fair value on a recurring basis, we consider the principal or most advantageous market in which we would transact and consider assumptions that market participants would use when pricing the asset or liability. When possible, we look to active and observable markets to price identical assets or liabilities. When identical assets and liabilities are not traded in active markets, we look to market observable data for similar assets and liabilities. Nevertheless, certain assets and liabilities are not actively traded in observable markets, and we use alternative valuation techniques to derive fair value measurements.
Variable Interest Entities	Variable Interest Entities: We are involved in the normal course of our business with various types of special purpose entities, some of which are variable interest entities, or VIEs, as defined by GAAP. We also invest in various forms of asset-backed securities, which we carry in our investment securities portfolio. These asset-backed securities meet the GAAP definition of asset securitization entities, which entities are considered to be VIEs. We are not considered to be the primary beneficiary of these VIEs, as defined by GAAP, since we do not have control over their activities. We use special purpose entities to structure and sell certificated interests in pools of tax-exempt investment-grade assets, principally to our mutual fund clients. These trusts are recorded in our consolidated financial statements. We transfer assets to these trusts, which are legally isolated from us, from our investment securities portfolio at adjusted book value. The trusts finance the acquisition of these assets by selling certificated interests issued by the trusts to third-party investors and to State Street as residual holder. The investment securities of the trusts are carried at fair value in investment securities available for sale. The certificated interests are carried at the amount owed to the third-party investors in other short-term borrowings. The interest revenue and interest expense generated by the investments and certificated interests, respectively, are recorded as components of net interest revenue when earned or incurred.
Derivative Financial Instruments	Derivative Financial Instruments: A derivative financial instrument is a financial instrument or other contract which has one or more referenced indices and one or more notional amounts, either no initial net investment or a smaller initial net investment than would be expected for similar types of contracts, and which requires or permits net settlement. Derivatives that we enter into include forwards, futures, swaps, options and other instruments with similar characteristics. We record derivatives in our consolidated statement of condition at their fair value. On the date a derivative contract is entered into, we designate the derivative as: (1) a hedge of the fair value of a recognized fixed-rate asset or liability or of an unrecognized firm commitment (a "fair value" hedge); (2) a hedge of a forecasted transaction or of the variability of cash flows to be received or paid related to a recognized variable-rate asset or liability (a "cash flow" hedge); (3) a foreign currency fair value or cash flow hedge (a "foreign currency" hedge); (4) a hedge of a net investment in a non-U.S. operation; or (5) a derivative utilized in either our trading activities or in our asset and liability management activities that is not accounted for as a hedge of an asset or liability.   Changes in the fair value of a derivative that is highly effective—and that is designated and qualifies as a fair value hedge—are recorded currently in processing fees and other revenue, along with the changes in fair value of the hedged asset or liability attributable to the hedged risk. Changes in the fair value of a derivative that is highly effective—and that is designated and qualifies as a cash flow hedge—are recorded, net of tax, in other comprehensive income, until earnings are affected by the hedged cash flows (e.g., when periodic settlements on a variable-rate asset or liability are recorded in earnings). Ineffectiveness of cash flow hedges, defined as the extent to which the changes in fair value of the derivative exceed the variability of cash flows of the forecasted transaction, is recorded in processing fees and other revenue. Changes in the fair value of a derivative that is highly effective—and that is designated and qualifies as a foreign currency hedge—are recorded currently either in processing fees and other revenue or in other comprehensive income, net of tax, depending on whether the hedge transaction meets the criteria for a fair value or a cash flow hedge. If, however, a derivative is used as a hedge of a net investment in a non-U.S. operation, its changes in fair value, to the extent effective as a hedge, are recorded, net of tax, in the foreign currency translation component of other comprehensive income. Lastly, entire changes in the fair value of derivatives utilized in our trading activities are recorded in trading services revenue, and entire changes in the fair value of derivatives utilized in our asset and liability management activities are recorded in processing fees and other revenue. At both the inception of the hedge and on an ongoing basis, we formally assess and document the effectiveness of a derivative designated as a hedge in offsetting changes in the fair value of hedged items and the likelihood that the derivative will be an effective hedge in future periods. We discontinue hedge accounting prospectively when we determine that the derivative is no longer highly effective in offsetting changes in fair value or cash flows of the underlying risk being hedged, the derivative expires, terminates or is sold, or management discontinues the hedge designation. Unrealized gains and losses on foreign exchange and interest-rate contracts are reported at fair value in our consolidated statement of condition as a component of other assets and other liabilities, respectively, on a gross basis, except where such gains and losses arise from contracts covered by qualifying master netting agreements.
Recent Accounting Developments	Recent Accounting Developments: The FASB is currently deliberating potentially significant changes to the U.S. accounting framework as part of an overall convergence effort with the International Accounting Standards Board under a previously signed memorandum of understanding. Some of these proposed changes have been exposed for comment, while others are expected to be exposed for comment over the next six to twelve months. These new proposals include potential changes to the accounting for financial instruments and hedging, the accounting for leases, revenue recognition and financial statement presentation. Once these proposed changes are finalized, we will disclose their nature and potential effect, if any, on our consolidated financial statements in our future filings. These proposed changes may have a material effect on our consolidated financial statements. In September 2011, the FASB issued an amendment to GAAP that modifies existing guidance with respect to impairment of goodwill. The amendment provides companies with an option to perform a qualitative assessment to determine whether further impairment testing is necessary. The amendment is effective, for State Street, for interim and annual periods beginning on January 1, 2012. Adoption of the amendment is not expected to have a material effect on our consolidated financial statements. In June 2011, the FASB issued an amendment to GAAP that eliminates the option to report other comprehensive income and its components in the statement of changes in shareholders' equity. Instead, an entity can elect to present the components of net income and other comprehensive income in either one continuous statement, referred to as the statement of comprehensive income, or in two separate, but consecutive statements. The amendment does not change which items are reported in other comprehensive income or the requirement to report reclassifications of items from other comprehensive income to net income. The amendment is effective, for State Street, for interim and annual periods beginning on January 1, 2012, and is required to be applied retrospectively. We are currently evaluating the options for presentation of other comprehensive income permitted by the amendment.   In May 2011, the FASB issued an amendment to GAAP associated with fair value measurement and related disclosures. While the amendment is not expected to significantly affect current practice, it clarifies the FASB's intent about the application of existing fair value measurement requirements, and requires the disclosure of additional quantitative information about fair value measurements. The amendment includes guidance about, among other things, the determination of a principal market and the measurement of fair value of instruments with offsetting market or counterparty credit risks. The amendment is effective, for State Street, for interim and annual periods beginning on January 1, 2012, and is required to be applied prospectively. Adoption of the amendment is not expected to have a material effect on our consolidated financial statements from a fair value measurement perspective. However, adoption is expected to result in additional disclosures in our consolidated financial statements. In April 2011, the FASB issued an amendment to GAAP that eliminates the requirement to consider collateral maintenance when determining whether a transfer of assets subject to a repurchase arrangement is accounted for as a sale or as a secured borrowing. The amendment is effective prospectively, for State Street, for new transactions and modifications of existing transactions that occur on or after January 1, 2012. Adoption of the amendment is not expected to have a material effect on our consolidated financial statements, since we currently account for repurchase agreements as secured borrowings.

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Variable Interest Entities (Policy)	12 Months Ended
Dec. 31, 2011
Variable Interest Entities [Abstract]
Asset-Backed Securitization Trusts	We are involved with various types of variable interest entities, or VIEs, as defined by GAAP, some of which are recorded in our consolidated financial statements and all of which are described below. We also invest in various forms of asset-backed securities, which we carry in our investment securities portfolio. These asset-backed securities meet the GAAP definition of asset securitization entities, which entities are considered to be VIEs. We are not considered to be the primary beneficiary of these VIEs, as defined by GAAP, since we do not have control over their activities. Additional information about our asset-backed securities is provided in note 3.
Tax-Exempt Investment Program	Tax-Exempt Investment Program: In the normal course of our business, we structure and sell certificated interests in pools of tax-exempt investment-grade assets, principally to our mutual fund clients. We structure these pools as partnership trusts, and the assets and liabilities of the trusts are recorded in our consolidated statement of condition as investment securities available for sale and other short-term borrowings. We may also provide liquidity and re-marketing services to the trusts. As of December 31, 2011 and 2010, we carried investment securities available for sale, composed of securities related to state and political subdivisions, with a fair value of $2.81 billion and $2.85 billion, respectively, and other short-term borrowings (refer to note 8) of $2.29 billion and $2.48 billion, respectively, in our consolidated statement of condition in connection with these trusts.  We transfer assets to the trusts from our investment securities portfolio at adjusted book value, and the trusts finance the acquisition of these assets by selling certificated interests issued by the trusts to third-party investors and to State Street as residual holder. These transfers do not meet the de-recognition criteria defined by GAAP, and therefore, are recorded in our consolidated financial statements. The trusts had a weighted-average life of approximately 7.4 years at December 31, 2011, compared to approximately 7.7 years at December 31, 2010. Under separate legal agreements, we provide standby bond-purchase agreements to these trusts and, with respect to certain securities, letters of credit. Our commitments to the trusts under these standby bond-purchase agreements and letters of credit totaled $2.35 billion and $669 million, respectively, at December 31, 2011, none of which was utilized at period-end. In the event that our obligations under these agreements are triggered, no material impact to our consolidated results of operations or financial condition is expected to occur, because the securities are already recorded at fair value in our consolidated statement of condition.
Asset-Backed Commercial Paper Program	Asset-Backed Commercial Paper Program: We previously sponsored and administered multi-seller asset-backed commercial paper programs, or conduits, which are recorded in our consolidated financial statements. As of December 31, 2011 and 2010, we carried assets, composed primarily of asset-backed securities, with an aggregate carrying value of $264 million and $5.01 billion, respectively, and loans, composed of purchased receivables (refer to note 4), of $935 million and $2.20 billion, respectively, in our consolidated statement of condition in connection with the conduits. In addition, as of December 31, 2010, we carried aggregate other short-term borrowings, associated with the conduits was outstanding to third parties as of December 31, 2011. In 2009, we elected to take action that resulted in the consolidation, for financial reporting purposes, of all of the assets and liabilities of the conduits into our consolidated statement of condition, as required by GAAP. We consolidated the conduits only for accounting purposes and did not legally acquire all of their assets and liabilities. Accordingly, we recorded the conduits' aggregate assets and liabilities in our consolidated statement of condition at their estimated fair values on the date of consolidation, and recorded a pre-tax extraordinary loss of approximately $6.10 billion, or approximately $3.68 billion after- tax, in our consolidated statement of income. This loss was primarily related to the difference between the fair value of the conduits' aggregate assets, primarily mortgage- and asset-backed securities, and the conduits' aggregate liabilities, primarily short-term borrowings composed of commercial paper issued by the conduits. The difference between the aggregate fair value of the conduits' investment securities and their par value on the date of consolidation created a discount. To the extent that the projected future cash flows from the securities we continue to hold exceed their recorded carrying amounts, the portion of the discount not related to credit will accrete into interest revenue over the securities' remaining terms. During the years ended December 31, 2011, 2010 and 2009, we recorded accretion of approximately $220 million, $712 million and $621 million, respectively, in interest revenue in our consolidated statement of income.
Collateralized Debt Obligations	Collateralized Debt Obligations:  We serve as collateral manager for a series of collateralized debt obligations, referred to as CDOs. A CDO is a structured investment vehicle which purchases a portfolio of assets funded through the issuance of several classes of debt and equity, the repayment of and return on which are linked to the performance of the underlying assets. We have determined that we are not the primary beneficiary of these VIEs, and do not record them in our consolidated financial statements. As of December 31, 2011 and 2010, the aggregate notional amount of these CDOs was $400 million and $1.0 billion, respectively. As of December 31, 2011 and 2010, the carrying amount of the underlying collateral was $166 million and $323 million, respectively. We have not acquired or transferred any investment securities to a CDO since 2005.

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Investment Securities (Tables)	12 Months Ended
Dec. 31, 2011
Investment Securities [Abstract]
Schedule Of Marketable Securities	2011      2010   (In millions)    Amortized Cost      Gross Unrealized      Fair Value      Amortized Cost      Gross Unrealized      Fair Value         Gains      Losses            Gains      Losses      Available for sale:                                                                         U.S. Treasury and federal agencies:                                                                         Direct obligations    $ 2,798       $ 39       $ 1       $ 2,836       $ 7,505       $ 74       $ 2       $ 7,577    Mortgage-backed securities      29,511         538         28         30,021         23,398         325         83         23,640    Asset-backed securities:                                                                         Student loans (1)      17,187         69         711         16,545         14,975         92         652         14,415    Credit cards      10,448         53         14         10,487         7,578         56         31         7,603    Sub-prime      1,849         2         447         1,404         2,161         3         346         1,818    Other      3,421         169         125         3,465         2,550         175         156         2,569                                                                              Total asset-backed securities      32,905         293         1,297         31,901         27,264         326         1,185         26,405                                                                              Non-U.S. debt securities:                                                                         Mortgage-backed securities      10,890         92         107         10,875         6,258         82         46         6,294    Asset-backed securities      4,318         2         17         4,303         1,790         13         17         1,786    Government securities      1,671         —           —           1,671         2,005         —           —           2,005    Other      2,797         41         13         2,825         1,900         34         2         1,932                                                                              Total non-U.S. debt securities      19,676         135         137         19,674         11,953         129         65         12,017                                                                              State and political subdivisions      6,924         244         121         7,047         6,706         102         204         6,604    Collateralized mortgage obligations      3,971         62         53         3,980         1,828         49         16         1,861    Other U.S. debt securities      3,471         159         15         3,615         2,438         116         18         2,536    U.S. equity securities      639         1         —           640         1,115         —           —           1,115    Non-U.S. equity securities      118         —           —           118         122         5         1         126                                                                              Total    $ 100,013       $ 1,471       $ 1,652       $ 99,832       $ 82,329       $ 1,126       $ 1,574       $ 81,881                                                                                                Held to maturity:                                                                         U.S. Treasury and federal agencies:                                                                         Mortgage-backed securities    $ 265       $ 18              $ 283       $ 413       $ 26                $ 439    Asset backed securities      31         —         $ 2         29         64         —         $ 5         59    Non-U.S. debt securities:                                                                         Mortgage-backed securities      4,973         87         224         4,836         6,332         166         160         6,338    Asset-backed securities      436         16         3         449         646         18         3         661    Government securities      3         —           —           3         —           —           —           —      Other      172         —           17         155         208         —           2         206    Total non-U.S. debt securities      5,584         103         244         5,443         7,186         184         165         7,205                                                                              State and political subdivisions      107         3         —           110         134         3         —           137    Collateralized mortgage obligations      3,334         220         57         3,497         4,452         328         44         4,736                                                                              Total    $ 9,321       $ 344       $ 303       $ 9,362       $ 12,249       $ 541       $ 214       $ 12,576                                                                              (1) Substantially composed of securities guaranteed by the federal government with respect to the payment of principal and interest.
Schedule Of Contractual Maturities Of Debt Securities	(In millions)    Under 1 Year      1 to 5 Years      6 to 10 Years      Over 10 Years   Available for sale:                                     U.S. Treasury and federal agencies:                                     Direct obligations    $ 1,200       $ 38       $ 822       $ 776    Mortgage-backed securities      5         755         10,871         18,390    Asset-backed securities:                                     Student loans      155         3,331         8,490         4,569    Credit cards      1,893         5,893         2,701         —      Sub-prime      581         82         17         724    Other      119         1,602         1,198         546    Total asset-backed securities      2,748         10,908         12,406         5,839                                          Non-U.S. debt securities:                                     Mortgage-backed securities      474         2,358         987         7,056    Asset-backed securities      230         916         2,511         646    Government securities      1,671         —           —           —      Other      1,636         958         231         —      Total non-U.S. debt securities      4,011         4,232         3,729         7,702                                          State and political subdivisions      471         2,326         3,328         922    Collateralized mortgage obligations      81         1,163         1,209         1,527    Other U.S. debt securities      289         1,391         1,899         36              Total    $ 8,805       $ 20,813       $ 34,264       $ 35,192                                                    Held to maturity:                                     U.S. Treasury and federal agencies:                                     Mortgage-backed securities           $ 19       $ 102       $ 144    Asset-backed securities             —           —           31    Non-U.S. debt securities:                                     Mortgage-backed securities    $ 1,304         254         —           3,415    Asset-backed securities      —           204         217         15    Government securities      3         —           —           —      Other      —           155         —           17                                          Total non-U.S. debt securities      1,307         613         217         3,447    State and political subdivisions      56         49         2         —      Collateralized mortgage obligations      394         1,350         530         1,060              Total    $ 1,757       $ 2,031       $ 851       $ 4,682
Critical Estimates Used In Roll Rate Analysis	Sub-Prime A Sub-Prime A Sub-Prime A      Sub-Prime ARM     Alt-A     Non- Agency Prime   December 31, 2011:        Prepayment rate      1-3 %      2-6 %      5-10 %  Cumulative loss estimates      46-54        26-39        9-19    Loss severity(1)      70-72        59-61        52-53    Peak-to-trough housing price decline(2)      35        35        35      Sub-Prime ARM Sub-Prime ARM Sub-Prime ARM      Sub-Prime ARM     Alt-A     Non- Agency Prime   December 31, 2010:        Prepayment rate      2-3 %      7 %      7-10 %  Cumulative loss estimates      33        21        13    Loss severity(1)      67        49        49    Peak-to-trough housing price decline(2)      35-40        35-40        35-40    (1) Loss severity rates consider the initial loan-to-value ratio, lien position, geography, expected collateral value and other factors. (2) Management's expectation of the Case-Shiller National Home Price Index.
Other-Than-Temporary Impairment Recorded On Securities	Year Ended December 31, 2011      Year Ended December 31, 2010      Year Ended December 31, 2009 (1)   (In millions)                      Sub-prime ARM    $ 2       $ 26       $ 29    Alt-A      5         43         20    Non-agency prime      5         89         60                               Total    $ 12       $ 158       $ 109                               (1) Represents the period from April 1, 2009 through December 31, 2009, subsequent to the adoption of the revised GAAP related to other-than-temporary impairment.
Schedule Of Gross Pre-tax Unrealized Losses On Investment Securities	Less than 12 months      12 months or longer      Total   December 31, 2011 (In millions)    Fair Value      Gross Unrealized Losses      Fair Value      Gross Unrealized Losses      Fair Value      Gross Unrealized Losses   Available for sale:                   U.S. Treasury and federal agencies:                   Direct obligations    $ 1,373       $ 1             $ 1,373       $ 1    Mortgage-backed securities      4,714         26       $ 370       $ 2         5,084         28    Asset-backed securities:                   Student loans      2,642         23         10,706         688         13,348         711    Credit cards      2,581         6         1,461         8         4,042         14    Sub-prime      16         1         1,360         446         1,376         447    Other      1,482         19         1,122         106         2,604         125                                                          Total asset-backed      6,721         49         14,649         1,248         21,370         1,297                                                          Non-U.S. debt securities:                   Mortgage-backed securities      6,069         55         1,151         52         7,220         107    Asset-backed securities      2,205         14         108         3         2,313         17    Other      1,543         13         —         —         1,543         13                                                          Total non-U.S. debt securities      9,817         82         1,259         55         11,076         137                                                          State and political subdivisions      171         3         1,446         118         1,617         121    Collateralized mortgage obligations      2,024         43         68         10         2,092         53    Other U.S. debt securities      220         2         57         13         277         15                                                          Total    $ 25,040       $ 206       $ 17,849       $ 1,446       $ 42,889       $ 1,652                                                          Held to maturity:                   Asset-backed securities          $ 29       $ 2       $ 29       $ 2    Non-U.S. debt securities:                   Mortgage-backed securities    $ 341       $ 6         1,382         218         1,723         224    Asset-backed securities      9         1         70         2         79         3    Other      —         —         138         17         138         17                                                          Total non U.S. debt securities      350         7         1,590         237         1,840         244                                                          Collateralized mortgage obligations      649         32         231         25         880         57                                                          Total    $ 999       $ 39       $ 1,850       $ 264       $ 2,849       $ 303                                                                  Less than 12 months      12 months or longer      Total   December 31, 2010 (In millions)    Fair Value      Gross Unrealized Losses      Fair Value      Gross Unrealized Losses      Fair Value      Gross Unrealized Losses   Available for sale:                   U.S. Treasury and federal agencies:                   Direct obligations          $ 153       $ 2       $ 153       $ 2    Mortgage-backed securities    $ 6,639       $ 81         431         2         7,070         83    Asset-backed securities:                   Student loans      1,980         25         8,457         627         10,437         652    Credit cards      1,268         5         2,396         26         3,664         31    Sub-prime      —         —         1,769         346         1,769         346    Other      269         3         1,122         153         1,391         156                                                          Total asset-backed securities      3,517         33         13,744         1,152         17,261         1,185                                                          Non-U.S. debt securities:                   Mortgage-backed securities      2,621         22         370         24         2,991         46    Asset-backed securities      —         —         54         17         54         17    Other      348         2         —         —         348         2                                                          Total non-U.S. debt securities      2,969         24         424         41         3,393         65                                                          State and political subdivisions      1,097         19         1,967         185         3,064         204    Collateralized mortgage obligations      494         5         109         11         603         16    Other U.S. debt securities      330         7         61         11         391         18    Non-U.S. equity securities      8         1         —         —         8         1                                                          Total    $ 15,054       $ 170       $ 16,889       $ 1,404       $ 31,943       $ 1,574                                                          Held to maturity:                   Asset-backed securities          $ 53       $ 5       $ 53       $ 5    Non-U.S. debt securities:                   Mortgage-backed securities    $ 1,445       $ 72         862         88         2,307         160    Asset-backed securities      —         —         68         3         68         3    Other      206         2         —         —         206         2                                                          Total non-U.S. debt securities      1,651         74         930         91         2,581         165                                                          Collateralized mortgage obligations      125         2         575         42         700         44                                                          Total    $ 1,776       $ 76       $ 1,558       $ 138       $ 3,334       $ 214
Gains And Losses Related To Investment Securities	(In millions)    2011     2010     2009   Gross realized gains from sales of investment securities    $ 152      $ 1,330      $ 418    Gross realized losses from sales of investment securities      (12 )      (1,385 )      (50 )  Gross losses from other-than-temporary impairment      (123 )      (651 )      (1,155 )  Losses not related to credit(1)      50        420        928                               Net impairment losses      (73 )      (231 )      (227 )  Gains (Losses) related to investment securities, net    $ 67      $ (286 )    $ 141                               Impairment associated with expected credit losses    $ (42 )    $ (203 )    $ (151 )  Impairment associated with management's intent to sell the impaired securities prior to their recovery in value      (8 )      (1 )      (54 )  Impairment associated with adverse changes in timing of expected future cash flows      (23 )      (27 )      (22 )                             Net impairment losses    $ (73 )    $ (231 )    $ (227 )                             (1) Pursuant to revised GAAP adopted on April 1, 2009, these losses were recorded, net of related taxes, a component of other comprehensive income; refer to note 12.
Schedule Of Credit-Related Loss Activity Recognized In Earnings	(In millions)        2011           2010          2009(1)   Beginning balance    $ 63      $ 175      $ —    Plus expected credit-related losses for which other-than-temporary impairment was not previously recognized      10        88        214    Plus expected credit-related losses for which other-than-temporary impairment was previously recognized      55        142        —    Less losses realized for securities sold      (13 )      (342 )      (17 )  Less losses realized for securities intended or required to be sold      (2 )      —        (22 )                           Ending balance    $ 113      $ 63      $ 175                             (1)  Beginning balance was as of April 1, 2009, pursuant to revised GAAP.

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Loans And Leases (Tables)	12 Months Ended
Dec. 31, 2011
Loans And Leases [Abstract]
Net Loans	(In millions)    2011     2010   Institutional:      Investment funds:      U.S.    $ 5,592      $ 5,316    Non-U.S.      796        1,478    Commercial and financial:      U.S.      563        540    Non-U.S.      453        190    Purchased receivables:      U.S.      563        728    Non-U.S.      372        1,471    Lease financing:      U.S.      397        417    Non-U.S.      857        1,053               Total institutional      9,593        11,193    Commercial real estate:      U.S.      460        764    Total loans and leases      10,053        11,957    Allowance for loan losses      (22 )      (100 )  Loans and leases, net of allowance for loan losses    $ 10,031      $ 11,857
Components Of The Net Investment In Leveraged Leases	(In millions)    2011     2010   Net rental income receivable    $ 1,671      $ 2,187    Estimated residual values      110        118    Unearned income      (527 )      (835 )                   Investment in leveraged lease financing      1,254        1,470    Less related deferred income tax liabilities      (397 )      (463 )                   Net investment in leveraged lease financing    $ 857      $ 1,007
Recorded Investment In Each Class Of Total Loans And Leases By Credit Quality Indicator	Institutional      Commercial Real Estate          December 31, 2011 (In millions)    Investment Funds      Commercial and Financial      Purchased Receivables      Lease Financing      Property Development      Other Acquired Credit- Impaired      Other      Total Loans and Leases   Investment grade    $ 6,341       $ 592       $ 935       $ 1,194       $ 1       $ 3       $ 36       $ 9,102    Speculative      47         424         —           60         379         31         5         946    Doubtful      —           —           —           —           —           5         —           5                                                                            Total    $ 6,388       $ 1,016       $ 935       $ 1,254       $ 380       $ 39       $ 41       $ 10,053                                                                                   Institutional             Commercial Real Estate                 December 31, 2010 (In millions)    Investment Funds      Commercial and Financial      Purchased Receivables      Lease Financing      Property Development      Property Development Acquired- Credit Impaired      Other Acquired Credit- Impaired      Other      Total Loans and Leases   Investment grade    $ 6,674       $ 579       $ 2,199       $ 1,279       $ 3          $ 3       $ 49       $ 10,786    Speculative      120         101         —           191         362            47         108         929    Substandard      —           50         —           —           —              —           —           50    Doubtful      —           —           —           —           86       $ 42         49         15         192    Total    $ 6,794       $ 730       $ 2,199       $ 1,470       $ 451       $ 42       $ 99       $ 172       $ 11,957
Schedule Of Allowance For Loan Losses	Institutional      Commercial Real Estate      Total Loans and Leases   (In millions)    2011      2010      2011      2010      2011      2010   Loans and leases:                   Individually evaluated for impairment    $ 56       $ 112       $ 421       $ 623       $ 477       $ 735    Collectively evaluated for impairment      9,537         11,081         —           —           9,537         11,081    Loans acquired with deteriorated credit quality      —           —           39         141         39         141                                                          Total loans and leases    $ 9,593       $ 11,193       $ 460       $ 764       $ 10,053       $ 11,957                                                          Allowance for loan losses:                   Individually evaluated for impairment             $ 24          $ 24    Collectively evaluated for impairment    $ 22       $ 31            —         $ 22         31    Loans acquired with deteriorated credit quality      —           —              45         —           45    Total allowance for loan losses    $ 22       $ 31         —         $ 69       $ 22       $ 100
Impaired Loans	December 31, 2011     Year Ended December 31, 2011     December 31, 2010   (In millions)   Recorded Investment     Unpaid Principal Balance     Related Allowance(1)     Average Recorded Investment     Interest Revenue Recognized     Recorded Investment     Unpaid Principal Balance     Related Allowance(1)   With no related allowance recorded:                 CRE - property development   $ 199      $ 227        $ 200      $ 15      $ 209      $ 240      CRE - property development – acquired credit-impaired     —          34          —          —            34      CRE - other - acquired credit-impaired     8        69          12        —          16        47      CRE - other     —          —            —          —          27        29      With an allowance recorded:                 CRE - property development     —          —            —          —          79        113      $ 24    CRE - property development – acquired credit-impaired     —          —            —          —          42        47        19    CRE - other - acquired credit-impaired     31        37        —          31        1        83        100        26    CRE - other     —          —          —          —          —          7        9        —                                                                      Total CRE   $ 238      $ 367        —        $ 243      $ 16      $ 463      $ 619      $ 69                                                                    (1) As of December 31, 2011 and December 31, 2010, we maintained allowances for loan losses of $22 million and $31 million, respectively, associated with loans and leases that were not impaired.
Financing Receivables On Non-Accrual Status	(In millions)    2011      2010   Commercial Real Estate:       Property development       $ 79    Property development - acquired credit-impaired         42    Other - acquired credit-impaired    $ 5         22    Other      —           15    Total    $ 5       $ 158
Schedule Of Activity In The Allowance For Loan Losses	(In millions)    2011     2010     2009        Institutional     Commercial Real  Estate     Total Loans and Leases     Total Loans and Leases     Total Loans and Leases   Allowance for loan losses:            Beginning balance    $ 31      $ 69      $ 100      $ 79      $ 18    Charge-offs      —          (78 )      (78 )      (4 )      (91 )  Provisions      (9 )      9        —          25        149    Recoveries      —          —          —          —          3                                             Ending balance    $ 22      $ —        $ 22      $ 100      $ 79

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Goodwill And Other Intangible Assets (Tables)	12 Months Ended
Dec. 31, 2011
Goodwill And Other Intangible Assets [Abstract]
Changes In The Carrying Amount Of Goodwill	2011     2010   (In millions)    Investment Servicing     Investment Management     Total     Investment Servicing      Investment Management      Total   Beginning balance    $ 5,591      $ 6      $ 5,597      $ 4,544       $ 6       $ 4,550    Acquisitions      68        32        100        1,005         —           1,005    Foreign currency translation, net      (49 )      (3 )      (52 )      42         —           42                                                       Ending balance    $ 5,610      $ 35      $ 5,645      $ 5,591       $ 6       $ 5,597
Changes In The Carrying Amount Of Other Intangible Assets	2011     2010   (In millions)    Investment Servicing     Investment Management     Total     Investment Servicing     Investment Management     Total   Beginning balance    $ 2,559      $ 34      $ 2,593      $ 1,760      $ 50      $ 1,810    Acquisitions      67        29        96        969        —          969    Amortization      (189 )      (11 )      (200 )      (170 )      (9 )      (179 )  Foreign currency translation, net      (29 )      (1 )      (30 )      (6 )      (1 )      (7 )  Other      —          —          —          6        (6 )      —                                                       Ending balance    $ 2,408      $ 51      $ 2,459      $ 2,559      $ 34      $ 2,593
Gross Carrying Amount, Accumulated Amortization And Net Carrying Amount Of Other Intangible Assets	2011      2010   (In millions)    Gross Carrying Amount      Accumulated Amortization     Net Carrying Amount      Gross Carrying Amount      Accumulated Amortization     Net Carrying Amount   Customer relationships    $ 2,369       $ (641 )    $ 1,728       $ 2,341       $ (520 )    $ 1,821    Core deposits      702         (117 )      585         710         (83 )      627    Other      233         (87 )      146         220         (75 )      145                                                        Total    $ 3,304       $ (845 )    $ 2,459       $ 3,271       $ (678 )    $ 2,593

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Other Assets (Tables)	12 Months Ended
Dec. 31, 2011
Other Assets [Abstract]
Components Of Other Assets	(In millions)    2011      2010   Collateral deposits    $ 6,688       $ 3,251    Unrealized gains on derivative financial instruments      6,366         5,255    Investments in joint ventures and other unconsolidated entities      1,060         927    Income taxes receivable      989         530    Accounts receivable      431         290    Deferred tax assets, net of valuation allowance(1)      395         1,786    Prepaid expenses      308         382    Receivable for securities sold      —         122    Other(2)      902         1,298                      Total    $ 17,139       $ 13,841                      (1) Deferred tax assets as of December 31, 2011 are net of deferred tax liabilities within the same tax jurisdiction.   (2) Amount for 2011 included other real estate owned of approximately $75 million.

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Deposits (Tables)	12 Months Ended
Dec. 31, 2011
Deposits [Abstract]
Scheduled Maturities Of Aggregate U.S. And Non-U.S. Time Deposits	(In millions)        2012    $ 8,862    2013      —      2014      —      2015      —      2016      40             Total    $ 8,902
Scheduled Maturities Of U.S. Time Deposits	(In millions)        3 months or less    $ 6,141    4 months to a year      161    Over a year      40    Total    $ 6,342

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Short-Term Borrowings (Tables)	12 Months Ended
Dec. 31, 2011
Short-Term Borrowings [Abstract]
Primary Components Of Short-Term Borrowings	Securities Sold Under Repurchase Agreements     Federal Funds Purchased   (Dollars in millions)    2011     2010     2009     2011     2010     2009   Balance at December 31    $ 8,572      $ 7,599      $ 10,542      $ 656      $ 7,748      $ 4,532    Maximum outstanding at any month-end      9,853        9,058        12,993        8,259        7,748        7,166    Average outstanding during the year      9,040        8,108        11,065        845        1,759        956    Weighted-average interest rate at year-end      .04 %      .04 %      .03 %      .05 %      .01 %      .01 %  Weighted-average interest rate during the year      .11        .05        .03        .05        .05        .04           Tax-Exempt Investment Program     Corporate Commercial Paper Program   (Dollars in millions)    2011     2010     2009     2011     2010     2009   Balance at December 31    $ 2,294      $ 2,484      $ 2,736      $ 2,384      $ 2,799      $ 2,777    Maximum outstanding at any month-end      2,473        2,690        2,838        2,825        2,831        2,851    Average outstanding during the year      2,404        2,594        2,774        2,449        2,791        1,993    Weighted-average interest rate at year-end      .18 %      .37 %      .33 %      .22 %      .31 %      .21 %  Weighted-average interest rate during the year      .26        .33        .47        .23        .31        .30         Conduit Commercial Paper  Program   (Dollars in millions)    2011     2010     2009 (1)   Balance at December 31      $ 1,919      $ 12,071    Maximum outstanding at any month-end    $ 271        7,275        15,645    Average outstanding during the year      113        6,339        10,691    Weighted-average interest rate at year-end      —          .57 %      1.31 %  Weighted-average interest rate during the year      .47 %      .32        1.26    (1) Amounts other than balance and weighted-average interest rate at year-end related to the period subsequent to the May 2009 conduit consolidation.
Securities Sold Under Repurchase Agreements	(In millions)        Collateralized by securities purchased under resale agreements    $ 5,651    Collateralized by investment securities      2,921             Total    $ 8,572
Schedule Of U.S. Government Securities And Related Repurchase Agreements Including Accrued Interest	U.S. Government Securities Sold      Repurchase Agreements   (Dollars in millions)    Amortized Cost      Fair Value      Amortized Cost      Rate   Overnight maturity    $ 2,931       $ 2,978       $ 2,921         .001 %

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Long-Term Debt (Tables)	12 Months Ended
Dec. 31, 2011
Long-Term Debt [Abstract]
Long-Term Debt	(Dollars in millions)    2011      2010   Statutory business trusts:       Floating-rate subordinated notes due to State Street Capital Trust IV in 2037    $ 800       $ 800    Floating-rate subordinated notes due to State Street Capital Trust I in 2028      155         155    Subordinated notes due to State Street Capital Trust III in 2042      —           500    Parent company and non-banking subsidiary issuances:       2.15% notes due 2012(1)      1,500         1,499    2.875% notes due 2016(2)      999         —      4.375% notes due 2021(2)      757         —      Long-term capital leases      694         716    4.956% junior subordinated debentures due 2018(2)      542         —      4.30% notes due 2014      512         500    5.375% notes due 2017      450         450    Floating-rate notes due 2012      250         268    Floating-rate notes due 2014      250         —      7.35% notes due 2026      150         150    State Street Bank issuances:       5.25% subordinated notes due 2018(2)      453         439    5.30% subordinated notes due 2016      419         423    Floating-rate subordinated notes due 2015      200         200    Floating-rate notes due 2011(1)      —           1,450    1.85% notes due 2011(1)      —           1,000                      Total long-term debt    $ 8,131       $ 8,550                      (1)  Notes are guaranteed by the FDIC under its Temporary Liquidity Guarantee Program, or TLGP. (2)  We have entered into interest-rate swap agreements, recorded as fair value hedges, to modify our interest expense on these subordinated notes from a fixed rate to a floating rate. As of December 31, 2011 and 2010, we recorded an increase of $140 million and $81 million, respectively, in the carrying value of long-term debt associated with fair value hedges. Refer to note 16 for additional information about derivatives.

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Commitments And Contingencies (Tables)	12 Months Ended
Dec. 31, 2011
Commitments And Contingencies [Abstract]
Contractual Amounts Of Credit-Related Off-Balance Sheet Financial Instruments	(In millions)    2011      2010   Indemnified securities financing(1)    $ 302,342       $ 334,235    Unfunded commitments to extend credit      17,297         14,772    Asset purchase agreements      5,056         4,866    Standby letters of credit      3,938         4,174    (1)  Related collateral and other information is provided in the following "Securities Finance" section.
Schedule Of Repurchase Agreements	(In millions)    2011      2010   Aggregate fair value of indemnified securities financing    $ 302,342       $ 334,235    Aggregate fair value of cash and securities held as collateral for indemnified securities financing      312,598         343,410    Aggregate fair value of collateral for indemnified securities financing invested in indemnified repurchase agreements      88,656         89,069    Aggregate fair value of cash and securities held by us or our agents as collateral for indemnified repurchase agreements      93,039         93,294

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Shareholders' Equity (Tables)	12 Months Ended
Dec. 31, 2011
Shareholders' Equity [Abstract]
Schedule Of Accumulated Other Comprehensive (Loss) Income	(In millions)    2011     2010     2009   Foreign currency translation      $ 216      $ 281    Net unrealized loss on hedges of net investments in non-U.S. subsidiaries    $ (14 )      (14 )      (14 )  Net unrealized gain (loss) on available-for-sale securities portfolio      110        (90 )      (1,001 )  Net unrealized loss related to reclassified available-for-sale securities      (189 )      (317 )      (635 )                           Net unrealized loss on available-for-sale securities      (79 )      (407 )      (1,636 )  Net unrealized loss on available-for-sale securities designated in fair value hedges      (210 )      (135 )      (113 )  Expected losses from other-than-temporary impairment on available-for-sale securities related to factors other than credit      (17 )      (17 )      (159 )  Expected losses from other-than-temporary impairment on held-to-maturity securities related to factors other than credit      (86 )      (111 )      (387 )  Net unrealized loss on cash flow hedges      (5 )      (11 )      (18 )  Minimum pension liability      (248 )      (210 )      (192 )                           Total    $ (659 )    $ (689 )    $ (2,238 )

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Fair Value (Tables)	12 Months Ended
Dec. 31, 2011
Fair Value [Abstract]
Schedule Of Fair Value Measurements On A Recurring Basis	Fair Value Measurements on a Recurring Basis as of December 31, 2011   (In millions)   Quoted Market Prices in Active Markets (Level 1)     Pricing Methods with Significant Observable Market Inputs (Level 2)     Pricing Methods with Significant Unobservable Market Inputs (Level 3)     Impact  of Netting(1)     Total Net Carrying Value in Consolidated Statement of Condition   Assets:           Trading account assets:           U.S. government securities   $ 20            $ 20    Non-U.S. government securities     498              498    Other     51      $ 138            189    Investment securities available for sale:           U.S. Treasury and federal agencies:           Direct obligations     1,727        1,109            2,836    Mortgage-backed securities     —        28,832      $ 1,189          30,021    Asset-backed securities:           Student loans     —        15,685        860          16,545    Credit cards     —        10,396        91          10,487    Sub-prime     —        1,404        —          1,404    Other     —        667        2,798          3,465                                      Total asset-backed securities     —        28,152        3,749          31,901                                      Non-U.S. debt securities:           Mortgage-backed securities     —        9,418        1,457          10,875    Asset-backed securities     —        2,535        1,768          4,303    Government securities     —        1,671        —          1,671    Other     —        2,754        71          2,825                                      Total non-U.S. debt securities     —        16,378        3,296          19,674                                      State and political subdivisions     —        6,997        50          7,047    Collateralized mortgage obligations     —        3,753        227          3,980    Other U.S. debt securities     —        3,613        2          3,615    U.S. equity securities     —        640        —          640    Non-U.S. equity securities     1        117        —          118                                      Total investment securities available for sale     1,728        89,591        8,513          99,832    Other assets:           Derivative instruments:           Foreign exchange contracts     —        12,045        168        Interest-rate contracts     —        1,795        10        Other     —        1        —                                    Total derivative instruments     —        13,841        178      $ (7,653 )      6,366    Other     110        —        —        —        110                                            Total assets carried at fair value   $ 2,407      $ 103,570      $ 8,691      $ (7,653 )    $ 107,015                                            Liabilities:           Accrued expenses and other liabilities:           Derivative instruments:           Foreign exchange contracts     $ 12,191      $ 161        Interest-rate contracts       1,970        11        Other       1        9                              Total derivative instruments       14,162        181      $ (7,653 )    $ 6,690    Other   $ 110        —        20        —        130                                            Total liabilities carried at fair value   $ 110      $ 14,162      $ 201      $ (7,653 )    $ 6,820                                            (1) Represents counterparty netting against level 2 financial assets and liabilities, where a legally enforceable master netting agreement exists between State Street and the counterparty. This netting cannot be disaggregated by type of derivative instrument.       Fair Value Measurements on a Recurring Basis as of December 31, 2010   (In millions)   Quoted Market Prices in Active Markets (Level 1)     Pricing Methods with Significant Observable Market Inputs (Level 2)     Pricing Methods with Significant Unobservable Market Inputs (Level 3)     Impact  of Netting(1)     Total Net Carrying Value in Consolidated Statement of Condition   Assets:           Trading account assets:           U.S. government securities   $ 20            $ 20    Non-U.S. government securities     297              297    Other     40      $ 122            162    Investment securities available for sale:           U.S. Treasury and federal agencies:           Direct obligations     6,529        1,048            7,577    Mortgage-backed securities     —        22,967      $ 673          23,640    Asset-backed securities:           Student loans     —        13,181        1,234          14,415    Credit cards     —        7,560        43          7,603    Sub-prime     —        1,818        —          1,818    Other     —        569        2,000          2,569                                      Total asset-backed securities     —        23,128        3,277          26,405                                      Non-U.S. debt securities           Mortgage-backed securities     —        5,898        396          6,294    Asset-backed securities     —        1,046        740          1,786    Government securities     —        2,004        1          2,005    Other     —        1,924        8          1,932                                      Total non-U.S. debt securities     —        10,872        1,145          12,017                                      State and political subdivisions     —        6,554        50          6,604    Collateralized mortgage obligations     —        1,502        359          1,861    Other U.S. debt securities     —        2,533        3          2,536    U.S. equity securities     —        1,115        —          1,115    Non-U.S. equity securities     7        119        —          126                                      Total investment securities available for sale     6,536        69,838        5,507          81,881                                      Other assets:           Derivative instruments:           Foreign exchange contracts     —        7,804        254        Interest-rate contracts     —        165        —        Other     —        2        —                                    Total derivative instruments     —        7,971        254      $ (2,970 )      5,255    Other     168        —        —        —        168                                            Total assets carried at fair value   $ 7,061      $ 77,931      $ 5,761      $ (2,970 )    $ 87,783                                            Liabilities:           Accrued expenses and other liabilities:           Trading account liabilities:           U.S. government securities   $ 210            $ 210    Non-U.S. government securities     345              345    Derivative instruments:           Foreign exchange contracts     —      $ 8,195      $ 260        Interest-rate contracts     1        358        —        Other     —        1        9                                    Total derivative instruments     1        8,554        269      $ (2,970 )      5,854    Other     168        3        —        —        171                                            Total liabilities carried at fair value   $ 724      $ 8,557      $ 269      $ (2,970 )    $ 6,580                                            (1) Represents counterparty netting against level 2 financial assets and liabilities, where a legally enforceable master netting agreement exists between State Street and the counterparty. This netting cannot be disaggregated by type of derivative instrument.
Schedule Of Fair Value Measurements Using Significant Unobservable Inputs	The following tables present activity related to our financial assets and liabilities categorized in level 3 of the valuation hierarchy during the years indicated. Transfers into and out of level 3 are reported as of the beginning of the period. During 2011 and 2010, transfers out of level 3 were substantially related to certain mortgage- or asset-backed securities and non-U.S. debt securities, for which fair value was measured using prices for which observable market information became available.     Fair Value Measurements Using Significant Unobservable Inputs Year Ended December 31, 2011                         Total Realized Unrealized Gains (Losses)                                   Change in Unrealized Gains (Losses) Related to Financial Instruments Held at December 31, 2011   (In millions)   Fair Value at December 31, 2010     Transfers in to Level 3     Transfers out of Level 3     Included in Revenue     Included in Other Comprehensive Income     Purchases     Issuances     Sales     Settlements     Fair Value at December 31, 2011     Assets:                       Investment securities available for sale:                       U.S. Treasury and federal agencies:                       Direct Obligations       $ (40 )        $ 40              Mortgage-backed securities   $ 673          (936 )      $ 1        1,540          $ (89 )    $ 1,189      Asset-backed securities:                       Student loans     1,234          (785 )    $ 3        (21 )      421            8        860      Credit cards     43          (285 )      4        (2 )      301            30        91      Sub-prime     —          —        —        —        —            —        —      Other     2,000      $ 114        (245 )      31        6        1,073        $ (49 )      (132 )      2,798                                                                                        Total asset-backed securities     3,277        114        (1,315 )      38        (17 )      1,795          (49 )      (94 )      3,749                                                                                        Non-U.S. debt securities                       Mortgage-backed securities     396        —        (838 )      —        (9 )      1,920          —        (12 )      1,457      Asset-backed securities     740        —        (939 )      1        7        2,179          (3 )      (217 )      1,768      Government securities     1        —        —        —        —        —          —        (1 )      —      Other     8        —        —        —        —        65          —        (2 )      71                                                                                        Total non-U.S. debt securities     1,145        —        (1,777 )      1        (2 )      4,164          (3 )      (232 )      3,296                                                                                        State and political subdivisions     50        1        (3 )      —        —        2          —        —        50      Collateralized mortgage obligations     359        —        (519 )      522        (4 )      428          —        (559 )      227      Other U.S. debt securities     3        —        —        —        —        —          —        (1 )      2                                                                                        Total investment securities available for sale     5,507        115        (4,590 )      561        (22 )      7,969          (52 )      (975 )      8,513                                                                                        Other assets:                       Derivative instruments:                       Foreign exchange contracts     254        —        —        (134 )      —        236          —        (188 )      168      $ (68 )  Interest-rate contracts     —        —        —        10        —        7          (7 )      —        10        9                                                                                            Total derivative instruments     254        —        —        (124 )      —        243          (7 )      (188 )      178        (59 )                                                                                          Total assets carried at fair value   $ 5,761      $ 115      $ (4,590 )    $ 437      $ (22 )    $ 8,212        —      $ (59 )    $ (1,163 )    $ 8,691      $ (59 )                                                                                                Fair Value Measurements Using Significant Unobservable Inputs Year Ended December 31, 2011                         Total Realized Unrealized (Gains} Losses                                   Change in Unrealized (Gains) Losses Related to Financial Instruments Held at December 31, 2011   (In millions)   Fair Value at December 31, 2010     Transfers in to Level 3     Transfers out of Level 3     Included in Revenue     Included in Other Comprehensive Income     Purchases     Issuances     Sales     Settlements     Fair Value at December 31, 2011     Liabilities:                       Accrued expenses and other liabilities:                       Derivative instruments:                       Foreign exchange contracts   $ 260          $ (122 )        $ 219        $ (196 )    $ 161      $ (60 )  Interest-rate contracts     —            11        $ (7 )      14      $ (7 )      —        11        10    Other     9            —            —        —        —        9        —                                                                                            Total derivative instruments     269            (111 )        (7 )      233        (7 )      (196 )      181        (50 )  Other     —            —            20        —        —        20        —                                                                                            Total liabilities carried at fair value   $ 269        —        —      $ (111 )      —      $ (7 )    $  253      $ (7 )    $ (196 )    $ 201      $ (50 )                                                                                                Fair Value Measurements Using Significant Unobservable Inputs Year  Ended December 31, 2010             Total Realized and Unrealized Gains (Losses)     Purchases, Issuances and Settlements, Net     Transfers Into and/or Out of Level 3     Fair Value at December 31, 2010     Change in Unrealized Gains (Losses) Related to Financial Instruments Held at December 31, 2010   (In millions)   Fair Value at December 31, 2009     Recorded in Revenue     Recorded in Other Comprehensive Income           Assets:               Investment securities available for sale:               U.S. Treasury and federal agencies:               Mortgage-backed securities   $ 58      $ (1 )    $ (1 )    $ 659      $ (42 )    $ 673      Asset-backed securities:               Student loans     3,175        9        81        (317 )      (1,714 )      1,234      Credit cards     312        17        (16 )      (31 )      (239 )      43      Sub-prime     3        1        —          —          (4 )      —        Other     2,507        92        160        (444 )      (315 )      2,000      Total asset-backed securities     5,997        119        225        (792 )      (2,272 )      3,277      Non-U.S. debt securities               Mortgage-backed securities     768        35        7        576        (990 )      396      Asset-backed securities     361        24        31        686        (362 )      740      Government securities     —          —          —          1        —          1      Other     40        (1 )      3        (39 )      5        8      Total non-U.S. debt securities     1,169        58        41        1,224        (1,347 )      1,145      State and political subdivisions     2        —          —          (1 )      49        50      Collateralized mortgage obligations     199        (35 )      6        362        (173 )      359      Other U.S. debt securities     3        —          —          —          —          3      Total investment securities available for sale     7,428        141        271        1,452        (3,785 )      5,507                                                        Other assets:               Derivatives-foreign exchange contracts     128        (55 )      —          181        —          254      $ (41 )  Total assets carried at fair value   $ 7,556      $ 86      $ 271      $ 1,633      $   (3,785 )    $   5,761      $   (41 )                                                                Fair Value Measurements Using Significant Unobservable Inputs Year  Ended December 31, 2010             Total Realized and Unrealized (Gains) Losses     Purchases, Issuances and Settlements, Net     Transfers Into and/or Out of Level 3     Fair Value at December 31, 2010     Change in Unrealized (Gains) Losses Related to Financial Instruments Held at December 31, 2010   (In millions)   Fair Value at December 31, 2009     Recorded in Revenue     Recorded in Other Comprehensive Income           Liabilities:               Accrued expenses and other liabilities:               Derivative instruments:               Foreign exchange contracts   $ 138      $ (72 )      $ 194        $ 260      $ (36 )  Other     9        —            —            9        —                                                              Total derivative instruments     147        (72 )      —          194        —          269        (36 )  Total liabilities carried at fair value   $ 147      $ (72 )      —        $ 194        —        $ 269      $ (36 )
Level 3 Total Realized And Unrealized Gains And Losses Recorded In Revenue	Year Ended December 31, 2011     Year Ended December 31, 2010     Year Ended December 31, 2009   (In millions)    Total Realized and Unrealized Gains (Losses) Recorded in Revenue     Change in Unrealized Gains (Losses) Related to Financial Instruments Held at December 31, 2011     Total Realized and Unrealized Gains (Losses) Recorded in Revenue      Change in Unrealized Gains (Losses) Related to Financial Instruments Held at December 31, 2010     Total Realized and Unrealized Gains (Losses) Recorded in Revenue     Change in Unrealized Gains (Losses) Related to Financial Instruments Held at December 31, 2009   Fee revenue:               Trading services    $ (13 )    $ (9 )    $ 17       $ (5 )    $ 38      $ (5 )  Processing fees and other      —          —          —           —          50        50                                                      Total fee revenue      (13 )      (9 )      17         (5 )      88        45    Net interest revenue      561        —          141         —          (101 )      —                                                        Total revenue    $ 548      $ (9 )    $ 158       $ (5 )    $ (13 )    $ 45
Reported Amounts And Estimated Fair Values For Financial Instruments	Reported      Fair   (In millions)    Amount      Value   2011:       Financial Assets:       Investment securities held to maturity    $ 9,321       $ 9,362    Net loans (excluding leases)      8,777         8,752    Financial Liabilities:       Long-term debt      8,131         8,206    2010:       Financial Assets:       Investment securities held to maturity    $ 12,249       $ 12,576    Net loans (excluding leases)      10,387         10,242    Financial Liabilities:       Long-term debt      8,550         8,498

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Equity-Based Compensation (Tables)	12 Months Ended
Dec. 31, 2011
Equity-Based Compensation [Abstract]
Weighted-Average Assumptions Used In Connection With The Option-Pricing Model	2009   Dividend yield      4.82 %  Expected volatility      26.70    Risk-free interest rate      2.49    Expected option lives (in years)      7.8
Stock Options And Stock Appreciation Rights Activity	Shares (in thousands)     Weighted Average Exercise Price      Weighted Average Remaining Contractual Term (in years)      Aggregate Intrinsic Value (in millions)   Stock Options and Stock Appreciation Rights:            Outstanding at December 31, 2009      13,167      $ 51.64          Exercised      (297 )      37.53          Forfeited or expired      (1,887 )      54.76          Outstanding at December 31, 2010      10,983        51.49          Exercised      (1,028 )      40.52          Forfeited or expired      (2,246 )      50.06                           Outstanding at December 31, 2011      7,709      $ 53.37         3.2       $ 10                     Exercisable at December 31, 2011      7,221      $ 53.69         2.9       $ 4
Restricted Stock Awards Activity	Shares (in thousands)     Weighted- Average Grant Date Fair Value   Restricted Stock Awards:      Outstanding at December 31, 2009      1,247      $ 41.87    Granted      5,264        44.49    Vested      (489 )      52.87    Forfeited      (221 )      44.95    Outstanding at December 31, 2010      5,801        43.21    Vested      (1,509 )      42.96    Forfeited      (127 )      44.59    Outstanding at December 31, 2011      4,165      $ 43.25
Deferred Stock Awards Activity	Shares (in  thousands)     Weighted-Average Grant Date Fair Value   Deferred Stock Awards:      Outstanding at December 31, 2009      6,573      $ 51.88    Granted      2,287        42.45    Vested      (2,356 )      57.76    Forfeited      (313 )      43.13               Outstanding at December 31, 2010      6,191        46.71    Granted      5,468        41.92    Vested      (2,361 )      52.86    Forfeited      (345 )      41.99               Outstanding at December 31, 2011      8,953      $ 42.34
Performance Awards Activity	Shares (in  thousands)     Weighted-Average Grant Date Fair Value   Performance Awards:      Outstanding at December 31, 2009      430      $ 24.14    Granted      1,421        43.33    Forfeited      (716 )      25.72    Paid out      (15 )      64.57               Outstanding at December 31, 2010      1,120        43.89    Granted      1,906        42.28    Forfeited      (173 )      42.90    Paid out      (224 )      46.03               Outstanding at December 31, 2011      2,629      $ 42.52

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Regulatory Matters (Tables)	12 Months Ended
Dec. 31, 2011
Regulatory Matters [Abstract]
Regulatory Capital Ratios and Related Amounts	Regulatory Guidelines(1)     State Street     State Street Bank   (Dollars in millions)    Minimum     Well Capitalized     2011     2010     2011     2010   Risk-based ratios:              Tier 1 capital      4 %      6 %      18.8 %      20.5 %      17.6 %      18.1 %  Total capital      8        10        20.5        22.0        19.6        19.9    Tier 1 leverage ratio      4        5        7.3        8.2        6.7        7.1    Total shareholders' equity        $ 19,398      $ 17,787      $ 18,494      $ 16,697    Trust preferred capital securities          950        1,450        —        —    Net unrealized loss on available-for-sale securities and cash flow hedges          395        680        398        682    Deferred tax liability associated with acquisitions          757        748        737        748    Recognition of pension plan funded status          248        186        245        187    Less:              Goodwill          5,645        5,597        5,353        5,365    Other intangible assets          2,459        2,593        2,297        2,460    Other deductions(2)          —        336        —        —                                         Tier 1 capital          13,644        12,325        12,224        10,489    Qualifying subordinated debt          1,339        959        1,343        959    Allowances for on- and off-balance sheet credit exposures          40        116        40        117    Unrealized gain on available-for-sale equity securities          —        2        —        —                                         Tier 2 capital          1,379        1,077        1,383        1,076    Deduction for investments in finance subsidiaries          (181 )      (171 )      —        —                                         Total capital        $ 14,842      $ 13,231      $ 13,607      $ 11,565                                         Adjusted total risk-weighted assets and market-riskequivalents:              On-balance sheet        $ 52,642      $ 46,209      $ 49,659      $ 44,103    Off-balance sheet          19,115        13,177        19,109        13,177    Market-risk equivalents          661        791        611        750                                         Total        $ 72,418      $ 60,177      $ 69,379      $ 58,030                                         Adjusted quarterly average assets        $ 186,336      $ 150,770      $ 183,086      $ 147,908                                         (1)  State Street Bank must comply with the regulatory guideline for "well capitalized" in order for the parent company to maintain its status as a financial holding company, including maintaining a minimum tier 1 risk-based capital ratio of 6%, a minimum total risk- based capital ratio of 10%, and a tier 1 leverage ratio of 5%. The "well capitalized" guideline requires us to maintain a minimum tier 1 risk-based capital ratio of 6% and a minimum total risk-based capital ratio of 10%.   (2)  Amounts included deferred tax assets not eligible for inclusion in regulatory capital.

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Derivative Financial Instruments (Tables)	12 Months Ended
Dec. 31, 2011
Derivative Financial Instruments [Abstract]
Schedule Of Outstanding Hedges: (Notional Amount)	(In millions)    December 31, 2011      December 31, 2010   Derivatives not designated as hedging instruments:       Interest-rate contracts:       Swap agreements and forwards    $ 238,008       $ 52,383    Options and caps purchased      1,431         140    Options and caps written      1,324         130    Futures      66,620         25,253    Foreign exchange contracts:       Forward, swap and spot      1,033,045         637,847    Options purchased      11,215         14,299    Options written      12,342         14,587    Credit derivative contracts:       Credit default swap agreements      105         155    Other:       Stable value contracts      40,963         46,758    Derivatives designated as hedging instruments:       Interest-rate contracts:       Swap agreements      3,872         1,886    Foreign exchange contracts:       Forwards      2,613         —
Notional Amount Of Interest Rate Swap Agreements Designated As Fair Value And Cash Flow Hedges	December 31, 2011      December 31, 2010   (In millions)    Fair Value Hedges      Cash Flow Hedges      Total      Fair Value Hedges      Cash Flow Hedges      Total   Investment securities available for sale    $ 1,298       $ 124       $ 1,422       $ 1,561       $ 125       $ 1,686    Long-term debt(1)      2,450         —           2,450         200         —           200    Total    $ 3,748       $ 124       $ 3,872       $ 1,761       $ 125       $ 1,886                                                          (1)  As of December 31, 2011 and 2010, fair value hedges of long-term debt increased the carrying value of long-term debt presented in our consolidated statement of condition by $140 million and $81 million, respectively.
Contractual And Weighted-Average Interest Rates, Which Include The Effects Of Hedges Related To Financial Instruments	Years Ended December 31,        2011     2010        Contractual Rates     Rate Including Impact of Hedges     Contractual Rates     Rate Including Impact of Hedges   Long-term debt      3.64 %      3.22 %      3.70 %      3.30 %
Schedule Of The Fair Values Of Derivative Financial Instruments	Asset Derivatives      Liability Derivatives         December 31, 2011      December 31, 2011   (In millions)    Balance Sheet Location    Fair Value      Balance Sheet Location    Fair Value   Derivatives not designated as hedging instruments:             Foreign exchange contracts    Other assets    $ 12,210       Other liabilities    $ 12,315    Interest-rate contracts    Other assets      1,682       Other liabilities      1,688    Other derivative contracts    Other assets      1       Other liabilities      10                            Total       $ 13,893          $ 14,013                            Derivatives designated as hedging instruments:             Interest-rate contracts    Other assets    $ 123       Other liabilities    $ 293    Foreign exchange contracts    Other assets      3       Other liabilities      37                            Total       $ 126          $ 330                                  Asset Derivatives      Liability Derivatives        December 31, 2010      December 31, 2010   (In millions)   Balance Sheet Location    Fair Value      Balance Sheet Location    Fair Value   Derivatives not designated as hedging instruments:            Foreign exchange contracts   Other assets    $ 8,058       Other liabilities    $ 8,455    Interest-rate contracts   Other assets            133       Other liabilities          131    Other derivative contracts   Other assets      2       Other liabilities      10                           Total      $ 8,193          $ 8,596                           Derivatives designated as hedges:            Interest-rate contracts   Other assets    $ 32       Other liabilities    $ 228                           Total      $ 32          $ 228
Impact Of Derivatives On Consolidated Statement Of Income	Location of Gain (Loss) on Derivative in Consolidated Statement of Income    Amount of Gain (Loss) on Derivative Recognized in Consolidated Statement of Income   (In millions)         Year ended December 31, 2011      Year Ended December 31, 2010     Year Ended December 31, 2009   Derivatives not designated as hedging instruments(1):            Interest-rate contracts    Trading services revenue    $ 21       $ 7      Interest-rate contracts    Processing fees and other revenue      —           10      $ 5    Foreign exchange contracts    Trading services revenue      641         618        677    Foreign exchange contracts    Processing fees and other revenue      7         (4 )      (5 )  Other derivative contracts    Trading services revenue      —           —          (3 )                               Total       $ 669       $ 631      $ 674                                 (1) Losses on derivatives related to book-value protection provided to stable value funds are recorded in other expenses, and totaled approximately $5 million, and $9 million, respectively, for the years ended December 31, 2010 and 2009. There were no losses related to stable value funds for the year ended December 31, 2011.     Location of Gain (Loss) on Derivative in Consolidated Statement of Income   Amount of Gain (Loss)  on Derivative Recognized in Consolidated Statement of Income     Hedged Item in Fair Value Hedging Relationship   Location of Gain (Loss) on Hedged Item in Consolidated Statement of Income   Amount of Gain (Loss)  on Hedged Item Recognized in Consolidated Statement of Income         Year Ended December 31,             Year Ended December 31,   (In millions)       2011     2010     2009             2011     2010     2009   Derivatives designated as fair value hedges:                   Interest-rate contracts   Processing fees and other revenue       $ (22 )    Deposits   Processing fees and other revenue       $ 22    Interest-rate contracts   Processing fees and other revenue   $ 75      $ 57        (30 )    Long-term debt   Processing fees and other revenue   $ (70 )    $ (49 )      30    Interest-rate contracts   Processing fees and other revenue     (165 )      (43 )      200      Available-for-sale securities   Processing fees and other revenue     153        40        (208 )  Foreign exchange contracts   Processing fees and other revenue     (161 )      —          —        Investment securities   Processing fees and other revenue     161        —          —      Total     $ (251 )    $ 14      $ 148          $ 244      $ (9 )    $ (156 )
Schedule Of Differences Between The Gains (Losses) On The Derivative And The Gains (Losses) On The Hedged Item	Amount of Gain (Loss) on Derivative Recognized in Other Comprehensive Income     Location of Gain (Loss) Reclassified from OCI to Consolidated Statement of Income   Amount of Gain (Loss) Reclassified from OCI to Consolidated Statement of Income     Location of Gain (Loss) on Derivative Recognized in Consolidated Statement of Income   Amount of Gain (Loss) on Derivative Recognized in Consolidated Statement of Income       Year Ended December 31,         Year Ended December 31,         Year Ended December 31,   (In millions)   2011     2010     2009         2011     2010     2009         2011     2010     2009   Derivatives designated as cash flow hedges:                       Interest-rate contracts   $ 9      $ 7      $ 14      Net interest revenue   $ (7 )    $ (7 )      —      Net interest revenue   $ 3      $ 5        —                                                                                Total   $ 9      $ 7      $ 14        $ (7 )    $ (7 )      —        $ 3      $ 5        —

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Net Interest Revenue (Tables)	12 Months Ended
Dec. 31, 2011
Net Interest Revenue [Abstract]
Components Of Interest Revenue And Interest Expense	(In millions)    2011      2010      2009   Interest revenue:          Deposits with banks Investment securities:    $ 149       $ 93       $ 156    U.S. Treasury and federal agencies      775         682         520    State and political subdivisions      221         222         225    Other investments      1,493         2,109         2,075    Securities purchased under resale agreements and federal funds sold      28         24         24    Loans and leases(1)      278         329         239    Trading account assets      —         —         20    Interest revenue associated with AMLF(2)      —         —         25    Other interest-earning assets      2         3         2                               Total interest revenue      2,946         3,462         3,286    Interest expense:          Deposits      220         213         195    Short-term borrowings(1)      96         257         200    Long-term debt      289         286         304    Interest expense associated with AMLF(2)      —         —         18    Other interest-bearing liabilities      8         7         5                               Total interest expense      613         763         722                               Net interest revenue    $ 2,333       $ 2,699       $ 2,564                               (1)  Amounts for 2010 included $67 million of interest revenue and interest expense related to the third-party asset-backed securitization trusts consolidated into our financial statements on January 1, 2010 in connection with our adoption of new GAAP. These trusts were de-consolidated in June 2010. (2)  Refers to the Federal Reserve's Asset-Backed Commercial Paper Money Market Mutual Fund Liquidity Facility, or AMLF, which expired in February 2010.

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Employee Benefits (Tables)	12 Months Ended
Dec. 31, 2011
Employee Benefits [Abstract]
Combined Information For The U.S. And Non-U.S. Defined Benefit Plans And Post-Retirement Plan	Primary U.S. and Non-U.S. Defined Benefit Plans     Post-Retirement Plan   (In millions)    2011     2010     2011     2010   Benefit obligations:          Beginning of year    $ 905      $ 808      $ 114      $ 112    Service cost      9        11        6        5    Interest cost      47        44        6        6    Employee contributions      1        1        —          —      Plan amendments      (4 )      —          —          —      Acquisitions and transfers      30        3        —          —      Actuarial losses (gains)      67        72        (5 )      (4 )  Benefits paid      (28 )      (28 )      (9 )      (7 )  Expenses paid      (1 )      —          —          —      Settlements      (1 )      (2 )      —          —      Foreign currency translation      (8 )      (4 )      —          —      Adjustment for rounding      —          —          —          2                                     End of year    $ 1,017      $ 905      $ 112      $ 114                                     Plan assets at fair value:          Beginning of year    $ 884      $ 828        Actual return on plan assets      50        84        Employer contributions      8        8      $ 9      $ 7    Acquisitions and transfers      21        (2 )      —          —      Benefits paid      (28 )      (28 )      (9 )      (7 )  Expenses paid      (1 )      —          —          —      Plan settlements      (1 )      (2 )      —          —      Foreign currency translation      (5 )      (4 )      —          —                                       End of year    $ 928      $ 884      $ —        $ —                                       Accrued benefit expense:          Funded status (plan assets less benefit obligations)    $ (89 )    $ (21 )    $ (112 )    $ (114 )                                   Net accrued benefit expense    $ (89 )    $ (21 )    $ (112 )    $ (114 )
Amounts Recognized In The Consolidated Statement Of Condition	Primary U.S. and Non-U.S. Defined Benefit Plans     Post- Retirement Plan   (In millions)    2011     2010     2011     2010   Amounts recognized in our consolidated statement of condition as of December 31:          Non-current assets    $ 45      $ 26        Current liabilities      (1 )      (2 )    $ (6 )    $ (9 )  Non-current liabilities      (133 )      (45 )      (106 )      (105 )                                   Net accrued amount recognized in statement of condition    $ (89 )    $ (21 )    $ (112 )    $ (114 )                                   Amounts recognized in accumulated other comprehensive income:          Prior service credit      $ (4 )    $ 3      $ 4    Net loss    $ (307 )      (242 )      (36 )      (43 )                                   Accumulated other comprehensive loss      (307 )      (246 )      (33 )      (39 )  Cumulative employer contributions in excess of net periodic benefit cost      218        225        (79 )      (75 )                                   Net obligation recognized in our consolidated statement of condition    $ (89 )    $ (21 )    $ (112 )    $ (114 )                                   Accumulated benefit obligation    $ 999      $ 887        Actuarial assumptions (U.S. Plans):          Used to determine benefit obligations as of December 31:          Discount rate      4.50 %      5.50 %      4.50 %      5.50 %  Rate of increase for future compensation      —        4.50        —        —    Used to determine periodic benefit cost for the years ended December 31:          Discount rate      5.50 %      6.00 %      5.50 %      6.00 %  Rate of increase for future compensation      4.50        4.50        —        —    Expected long-term rate of return on plan assets      7.25        7.25        —        —    Assumed health care cost trend rates as of December 31:          Cost trend rate assumed for next year      —        —        7.80 %      7.62 %  Rate to which the cost trend rate is assumed to decline      —        —        4.50        4.50    Year that the rate reaches the ultimate trend rate      —        —        2029        2026
Expected Benefit Payments	(In millions)    Primary U.S. and  Non-U.S. Defined Benefit Plans      Non- Qualified SERPs      Post-Retirement Plan   2012    $ 33       $ 27       $ 6    2013      33         13         6    2014      34         12         7    2015      35         14         7    2016      27         13         7    2017-2021      169         59         35
Plan's Assets Measured At Fair Value On A Recurring Basis	Fair Value Measurements on a Recurring Basis as of December 31, 2011   (In millions)   Quoted Market Prices in Active Markets (Level 1)     Pricing Methods with Significant Observable Market Inputs (Level 2)     Pricing Methods with Significant Unobservable Market Inputs (Level 3)     Total Net Carrying Value   Assets:         U.S. Pension Plan         Investments in pooled investment funds:         Domestic large cap equity     $ 129        $ 129    Domestic small cap equity       14          14    Developed international equities       62          62    Emerging markets equity       28          28    Investment grade fixed-income       311          311    High yield fixed-income       26          26    Real estate investment trusts       23          23    Alternative investments (commingled fund)       —      $ 5        5    Alternative investments (fund of funds)       —        14        14    Private equity       —        2        2    Cash       6        —        6                                    Total U.S. Pension Plan       —        599        21        620                                    U.K. Pension Plan         Investments in pooled investment funds:         Developed international equity       24        —        24    U.K. fixed-income       187        —        187    Emerging market index       8        —        8    Alternative investments       —        32        32                                    Total U.K. pension plan     —        219        32        251                                    Other Non-U.S. Pension Plans (Excluding U.K.)         Insurance group annuity contracts       —        57        57                                    Total Other Non-U.S. Pension Plans (Excluding U.K.)     —        —        57        57                                    Total assets carried at fair value     —      $ 818      $ 110      $ 928       Fair Value Measurements on a Recurring Basis as of December 31, 2010   (In millions)   Quoted Market Prices in Active Markets (Level 1)     Pricing Methods with Significant Observable Market Inputs (Level 2)     Pricing Methods with Significant Unobservable Market Inputs (Level 3)     Total Net Carrying Value   Assets:         U.S. Pension Plan         Investments in pooled investment funds:         Domestic large cap equity     $ 120        $ 120    Domestic small cap equity       15          15    Developed international equities       67          67    Emerging markets equity       38          38    Investment grade fixed-income       308          308    High yield fixed-income       31          31    Real estate investment trusts       21          21    Alternative investments (commingled fund)       —      $ 5        5    Alternative investments (fund of funds)       —        14        14    Private equity       —        2        2    Cash       9        —        9                                    Total U.S. Pension Plan       —        609        21        630                                    U.K. Pension Plan         Investments in insurance vehicles:         Developed international equity       33        —        33    U.K. fixed-income       144        —        144    Emerging market index       8        —        8    Alternative investments       —        33        33                                    Total U.K. pension plan     —        185        33        218                                    Other Non-U.S. Pension Plans (Excluding U.K.)         Insurance group annuity contracts       —        36        36                                    Total Other Non-U.S. Pension Plans (Excluding U.K.)     —        —        36        36                                    Total assets carried at fair value     —      $ 794      $ 90      $ 884
Fair Value Measurements Using Significant Unobservable Inputs	Fair Value Measurements Using Significant Unobservable Inputs Year Ended December 31, 2011       U.S. Pension Plans     U.K. Pension Plan     Non-U.S. Pension Plans (Excluding U.K.)   (In millions)   Alternative Investments     Private Equity     Alternative Investments     Insurance group annuity contract   Assets:         Fair value at December 31, 2010   $ 19      $ 2      $ 33      $ 36    Purchases and sales, net     —        —        (1 )      24    Unrealized losses     —        —        —        (3 )                                  Fair value at December 31, 2011   $ 19      $ 2      $ 32      $ 57                                          Fair Value Measurements Using Significant Unobservable Inputs Year Ended December 31, 2010       U.S. Pension Plans     U.K. Pension Plan     Non-U.S. Pension Plans (Excluding U.K.)   (In millions)   Alternative Investments     Private Equity     Alternative Investments     Insurance group annuity contract   Assets:         Fair Value at December 31, 2009   $ 13      $ 2      $ 24      $ 31    Purchases and sales, net     4        —        7        1    Unrealized gains     2        —        2        4                                    Fair value at December 31, 2010   $ 19      $ 2      $ 33      $ 36
Defined Pension Benefits In Excess Of Qualified Plan Limits, Information For The SERPs	Non-Qualified SERPs   (In millions)        2011             2010       Benefit obligations:      Beginning of year    $ 165      $ 182    Service cost      1        1    Interest cost      8        10    Actuarial gain (losses)      23        (2 )  Benefits paid      (2 )      (2 )  Settlements      (22 )      (24 )                   End of year    $ 173      $ 165                     Accrued benefit expense:      Funded status (plan assets less benefit obligations)    $ (173 )    $ (165 )                   Net accrued benefit expense    $ (173 )    $ (165 )                   Amounts recognized in our consolidated statement of condition as of December 31:      Current liabilities    $ (27 )    $ (27 )  Non-current liabilities      (146 )      (138 )                   Net accrued amount recognized in our consolidated statement of condition    $ (173 )    $ (165 )                   Amounts recognized in accumulated other comprehensive income:      Net loss    $ (58 )    $ (45 )                   Accumulated other comprehensive loss      (58 )      (45 )  Cumulative employer contributions in excess of net periodic benefit cost      (115 )      (120 )                   Net obligation recognized in our consolidated statement of condition    $ (173 )    $ (165 )                   Accumulated benefit obligation    $ 173      $ 165    Actuarial assumptions:      Assumptions used to determine benefit obligations and periodic benefit costs are consistent with those noted for the post-retirement plan, with the following exceptions:      Rate of increase for future compensation—SERPs      —        4.75 %  Rate of increase for future compensation—Executive SERPs      10.00 %      10.00
The Actuarially Determined Expense For U.S. And Non-U.S. Defined Benefit Plans, Post-Retirement Plan And SERPs	The following table presents the actuarially determined expense for our U.S. and non-U.S. defined benefit plans, post-retirement plan and SERPs for the years ended December 31:        Primary U.S. and Non-U.S.     Post-Retirement        Defined Benefit Plans     Plan   (In millions)    2011     2010     2009     2011     2010     2009   Components of net periodic benefit cost:              Service cost    $ 9      $ 11      $ 13      $ 6      $ 5      $ 4    Interest cost      47        44        45        6        6        6    Assumed return on plan assets      (58 )      (55 )      (56 )      —          —          —      Amortization of net loss      12        7        6        1        2        1                                                     Net periodic benefit cost      10        7        8        13        13        11    Settlements      —          —          (1 )      —          —          —      Curtailments      —          —          (1 )      —          —          —      Special termination benefits      —          —          —          —          —          1                                                     Total expense    $ 10      $ 7      $ 6      $ 13      $ 13      $ 12                                                     Estimated amounts that will be amortized from accumulated other comprehensive income over the next fiscal year:              Net loss    $ (17 )    $ (13 )    $ (7 )    $ (1 )    $ (2 )    $ (2 )                                                   Estimated amortization    $ (17 )    $ (13 )    $ (7 )    $ (1 )    $ (2 )    $ (2 )                                                        Non-Qualified SERPs   (In millions)      2011         2010         2009     Components of net periodic benefit cost:        Service cost    $ 1      $ 1      $ 2    Interest cost      8        10        10    Amortization of net loss      3        5        3                             Net periodic benefit cost      12        16        15    Settlements      7        8        4                             Total expense    $ 19      $ 24      $ 19                             Estimated amounts that will be amortized from accumulated other comprehensive income over the next fiscal year:        Net loss    $ (5 )    $ (3 )    $ (5 )                           Estimated amortization    $ (5 )    $ (3 )    $ (5 )

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Occupancy Expense And Information Systems And Communications Expense (Tables)	12 Months Ended
Dec. 31, 2011
Occupancy Expense And Information Systems And Communications Expense [Abstract]
Summary Of Future Minimum Lease Payments Under Non Cancelable Capital And Operating Leases	(In millions)    Capital Leases     Operating Leases      Total   2012    $ 68      $ 237       $ 305    2013      68        207         275    2014      68        182         250    2015      67        132         199    2016      71        96         167    Thereafter      647        275         922                              Total minimum lease payments      989      $ 1,129       $ 2,118                        Less amount representing interest payments      (327 )                     Present value of minimum lease payments    $ 662

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Acquisition And Restructuring Costs (Tables)	12 Months Ended
Dec. 31, 2011
Acquisition And Restructuring Costs [Abstract]
Costs Related To Acquisition And Restructuring	(In millions)    2011      2010      2009   Acquisition costs    $ 16       $ 89       $ 49    Restructuring charges      253         156         —                                 Total    $ 269       $ 245       $ 49
Activity Related To Restructuring-Related Accruals	(In millions)    Employee- Related Costs     Real Estate Consolidation     Information Technology Costs     Fixed-Income Trading Portfolio      Asset and Other Write- offs     Total   Initial restructuring-related accrual    $ 105      $ 51             $ 156    Payments      (15 )      (4 )             (19 )                                                    Balance at December 31, 2010      90        47               137    Additional accruals for business operations and information technology transformation program      85        7      $ 41             133    Accruals for expense control measures      62        —          —        $ 38       $ 20        120    Payments and adjustments      (75 )      (15 )      (8 )      —           (5 )      (103 )                                                    Balance at December 31, 2011    $ 162      $ 39      $ 33      $ 38       $ 15      $ 287

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Income Taxes (Tables)	12 Months Ended
Dec. 31, 2011
Income Taxes [Abstract]
Schedule Of Components Of Income Tax Expense	(In millions)    2011      2010     2009   Current:         Federal    $ 49       $ (885 )    $ 75    State      54         15        39    Non-U.S.      295         156        157                              Total current expense (benefit)      398         (714 )      271    Deferred:         Federal      134         745        383    State      8         141        28    Non-U.S.      76         358        40                        Total deferred expense      218         1,244        451    Total income tax expense    $ 616       $ 530      $ 722
Schedule Of Components Of Deferred Tax Liabilities And Assets	(In millions)    2011     2010   Deferred tax liabilities:      Lease financing transactions    $ 397      $ 463    Fixed and intangible assets      1,067        1,029    Other      21        122                     Total deferred tax liabilities    $ 1,485      $ 1,614                     Deferred tax assets:      Foreign currency translation    $ 2      $ 70    Unrealized losses on securities, net      651        1,083    Deferred compensation      162        183    Defined benefit pension plan      180        121    Expenses      141        177    Real estate      28        33    Other      104        137                     Total deferred tax assets      1,268        1,804                     Valuation allowance for deferred tax assets      (19 )      (18 )                   Deferred tax assets net of valuation allowance    $ 1,249      $ 1,786
Schedule Of Reconciliation Of The U.S. Statutory Income Tax Rate To The Effective Tax Rate	2011     2010     2009   U.S. federal income tax rate      35.0 %      35.0 %      35.0 %  Changes from statutory rate:        State taxes, net of federal benefit      2.0        1.2        1.7    Tax-exempt income      (2.9 )      (3.6 )      (3.1 )  Tax credits      (1.5 )      (1.3 )      (1.6 )  Foreign tax differential      (4.3 )      (3.6 )      (5.0 )  Transactions related to investment securities (1)      (4.1 )      (2.3 )      —      Non-deductible penalty      —          —          1.0    Other, net      .1        —          .6                             Effective tax rate      24.3 %      25.4 %      28.6 %                           (1)  Amounts for both years represented the effect of discrete tax benefits related to the cost to terminate funding obligations that supported former conduit asset structures; the amount for 2010 also included the partial write-off of a deferred tax asset associated with certain of the investment securities sold in connection with our December 2010 investment portfolio repositioning.
Summary Of Activity Related To Unrecognized Tax Benefits	(In millions)    2011     2010   Balance at beginning of year    $ 446      $ 386    Increase (Decrease) related to agreements with tax authorities      (322 )      27    Increase related to tax positions taken during current year      1        33                     Balance at end of year    $ 125      $ 446

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Earnings Per Common Share (Tables)	12 Months Ended
Dec. 31, 2011
Earnings Per Common Share [Abstract]
Computation Of Basic And Diluted Earnings Per Share	(Dollars in millions, except per share amounts)    2011     2010     2009   Net income before extraordinary loss    $ 1,920      $ 1,556      $ 1,803    Less:        Prepayment and accretion of preferred stock discount      —        —        (117 )  Preferred stock dividends      (20 )      —        (46 )  Dividends and undistributed earnings allocated to participating securities(1)      (18 )      (16 )      —                             Net income before extraordinary loss available to common shareholders    $ 1,882      $ 1,540      $ 1,640                             Average shares outstanding (in thousands):        Basic average shares      492,598        495,394        470,602    Effect of dilutive securities: stock options and stock awards      3,474        2,530        3,401                             Diluted average shares      496,072        497,924        474,003                             Anti-dilutive securities(2)      2,382        10,316        12,904    Earnings per common share before extraordinary loss:        Basic    $ 3.82      $ 3.11      $ 3.50    Diluted(3)      3.79        3.09        3.46    (1)  Represented the portion of net income available to common equity allocated to participating securities; participating securities, composed of unvested restricted stock and director stock, have non-forfeitable rights to dividends during the vesting period on a basis equivalent to dividends paid to common shareholders.   (2) Represented stock options, restricted stock and other securities outstanding but not included in the computation of diluted average shares because their effect was anti-dilutive.   (3) Calculations for 2011 and 2010 reflected the allocation of earnings to participating securities using the two-class method, as this computation was more dilutive than the calculation using the treasury stock method.

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Line Of Business Information (Tables)	12 Months Ended
Dec. 31, 2011
Line Of Business Information [Abstract]
Summary Of Line Of Business Results	Investment Servicing     Management Investment     Other     Total   Years ended December 31,   2011     2010     2009     2011     2010     2009     2011     2010     2009     2011     2010     2009   (Dollars in millions, except where otherwise noted)                                                                         Fee revenue:                         Servicing fees   $ 4,382      $ 3,938      $ 3,334                  $ 4,382      $ 3,938      $ 3,334    Management fees     —        —        —      $ 917      $ 829      $ 766              917        829        766    Trading services     1,220        1,106        1,094        —        —        —              1,220        1,106        1,094    Securities finance     333        265        387        45        53        183              378        318        570    Processing fees and other     195        225        72        102        124        99              297        349        171                                                                                  Total fee revenue     6,130        5,534        4,887        1,064        1,006        1,048              7,194        6,540        5,935    Net interest revenue     2,181        2,553        2,489        152        146        68          $ 7        2,333        2,699        2,564    Gains (Losses) related to investment securities, net     67        58        141        —        —        —        $ (344 )      —        67        (286 )      141                                                                                                    Total revenue     8,378        8,145        7,517        1,216        1,152        1,116          (344 )      7        9,594        8,953        8,640    Provision for loan losses     —        25        148        —        —        1          —        —        —        25        149    Expenses from operations     5,889        5,430        4,920        900        753        747          —        —        6,789        6,183        5,667    Securities lending charge     —        75        —        —        339        —          —        —        —        414        —    Provision for fixed-income litigation exposure     —        —        —        —        —        250          —        —        —        —        250    Acquisition costs     —        —        —        —        —        —      $ 16        89        49        16        89        49    Restructuring charges     —        —        —        —        —        —        253        156        —        253        156        —                                                                                                    Total expenses     5,889        5,505        4,920        900        1,092        997        269        245        49        7,058        6,842        5,966                                                                                                    Income from continuing operations before income taxes   $ 2,489      $ 2,615      $ 2,449      $ 316      $ 60      $ 118      $ (269 )    $ (589 )    $ (42 )    $ 2,536      $ 2,086      $ 2,525                                                                                                    Pre-tax margin     30 %      32 %      33 %      26 %      5 %      11 %            26 %      23 %      29 %  Average assets (in billions)   $ 169.4      $ 146.9      $ 143.7      $ 5.4      $ 5.1      $ 3.1            $ 174.8      $ 152.0      $ 146.8

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Non-U.S. Activities (Tables)	12 Months Ended
Dec. 31, 2011
Non-U.S. Activities [Abstract]
Schedule Of Results From Non-U.S. Operations	(In millions)    2011     2010      2009   Total fee revenue    $ 3,004      $ 2,661       $ 2,291    Net interest revenue      1,104        725         422    Gains (Losses) related to investment securities, net      (25 )      449         (37 )                            Total revenue      4,083        3,835         2,676    Expenses      3,415        2,962         2,457                              Income before income taxes      668        873         219    Income tax expense      172        327         84                              Net income    $ 496      $ 546       $ 135
Summary Of Non-U.S. Assets	(In millions)      2011         2010    Interest-bearing deposits with banks    $ 10,772       $ 9,443    Non-U.S. investment securities      25,376         19,329    Other assets      15,518         13,994                      Total assets    $ 51,666       $ 42,766

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Parent Company Financial Statements (Tables)	12 Months Ended
Dec. 31, 2011
Parent Company Financial Statements [Abstract]
Parent Company Statement Of Income	Years ended December 31,    2011     2010     2009   (In millions)                    Cash dividends from consolidated banking subsidiary      $ 1,400      $ 250    Cash dividends from consolidated non-banking subsidiaries and unconsolidated entities    $ 60        100        25    Other, net      34        9        (11 )                           Total revenue      94        1,509        264    Interest expense      203        162        178    Other expenses      60        421        53                             Total expenses      263        583        231    Income tax benefit      (125 )      (93 )      (38 )                           Income (Loss) before equity in undistributed income of consolidated subsidiaries and unconsolidated entities      (44 )      1,019        71    Extraordinary loss, net of taxes      —          —          (20 )  Equity in undistributed income (loss) of consolidated subsidiaries and unconsolidated entities:        Consolidated banking subsidiary      1,773        484        (1,987 )  Consolidated non-banking subsidiaries and unconsolidated entities      191        53        55                             Net income (loss)    $ 1,920      $ 1,556      $ (1,881 )
Parent Company Statement Of Condition	As of December 31,    2011      2010   (In millions)               Assets:       Interest-bearing deposits with consolidated banking subsidiary    $ 4,914       $ 5,058    Trading account assets      138         122    Investment securities available for sale      25         24    Investments in subsidiaries:       Consolidated banking subsidiary      18,724         16,697    Consolidated non-banking subsidiaries      2,340         2,299    Unconsolidated entities      326         297    Notes and other receivables from:       Consolidated banking subsidiary      618         —      Consolidated non-banking subsidiaries and unconsolidated entities      302         283    Other assets      994         850    Total assets    $ 28,381       $ 25,630                      Liabilities:       Commercial paper    $ 2,384       $ 2,799    Accrued taxes, expenses and other liabilities due to:       Consolidated banking subsidiary      —           561    Third parties      276         161    Long-term debt      6,323         4,322                      Total liabilities      8,983         7,843    Shareholders' equity      19,398         17,787                      Total liabilities and shareholders' equity    $ 28,381       $ 25,630
Parent Company Statement Of Cash Flows	Years ended December 31,    2011     2010     2009   (In millions)                    Net cash (used in) provided by operating activities    $ (571 )    $ 1,453      $ (24 )  Investing Activities:        Net (increase) decrease in interest-bearing deposits with banking subsidiary      144        (831 )      (1,457 )  Proceeds from sales and maturities of available-for-sale securities      —        1        36    Net decrease in securities related to AMLF      —        —        3,104    Investments in non-banking subsidiaries and unconsolidated entities      (648 )      (277 )      (776 )  Sale of investment in non-banking subsidiaries and unconsolidated entities      39        127        —    Business acquisitions      (51 )      (141 )      —                             Net cash (used in) provided by investing activities      (516 )      (1,121 )      907    Financing Activities:        Net decrease in short-term borrowings related to AMLF      —        —        (3,063 )  Net (decrease) increase in commercial paper      (415 )      22        189    Proceeds from issuance of long-term debt, net of issuance costs      1,986        —        1,992    Payments for long-term debt      —        (300 )      —    Proceeds from issuance of preferred stock      500        —        —    Redemption of TARP preferred stock      —        —        (2,000 )  Proceeds from public offering of common stock, net of issuance costs      —        —        2,231    Repurchase of TARP common stock warrant      —        —        (60 )  Purchases of common stock      (675 )      —        —    Proceeds from exercises of common stock options      40        10        34    Repurchases of common stock for employee tax withholding      (63 )      (44 )      (38 )  Proceeds from issuances of treasury stock for common stock awards and option exercises      9        —        —    Payments for cash dividends      (295 )      (20 )      (168 )                           Net cash provided by (used in) financing activities      1,087        (332 )      (883 )                           Net change      —        —        —    Cash and due from banks at beginning of year      —        —        —                             Cash and due from banks at end of year    $ —      $ —      $ —

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Summary Of Significant Accounting Policies (Details)	12 Months Ended
Dec. 31, 2011 days
Number of days before loans are placed on non-accrual status	60
Estimated useful lives or term of the lease, minimum, years	3
Estimated useful lives or term of the lease, maximum, years	40
Other Intangible Assets [Member]
Finite-lived intangible assets, useful life, minimum, years	5
Finite-lived intangible assets, useful life, maximum, years	20
Core Deposits Intangibles [Member]
Finite-lived intangible assets, useful life, minimum, years	16
Finite-lived intangible assets, useful life, maximum, years	22

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Acquisitions (Details)	3 Months Ended	12 Months Ended			12 Months Ended		12 Months Ended
Dec. 31, 2010 EUR (€)	Dec. 31, 2011 USD ($)	Dec. 31, 2010 USD ($)	Jun. 30, 2010 USD ($)	Dec. 31, 2009 USD ($)	Dec. 31, 2011 Pulse Trading, Inc. [Member]	Dec. 31, 2011 Bank Of Ireland's Asset Management [Member] USD ($)	Dec. 31, 2011 Intesa Sanpaolo's Securities Services [Member] USD ($)	Dec. 31, 2011 Complementa Investment Controlling AG And Pulse Trading Inc [Member] USD ($)	Jun. 30, 2010 Mourant International Finance Administration [Member] USD ($)
Business Acquisition [Line Items]
Assessment for taxes, penalties and interest	€ 130,000,000
Goodwill resulting from acquisition							31,000,000	932,000,000	68,000,000	73,000,000
Other intangible assets		2,459,000,000	2,593,000,000		1,810,000,000		27,000,000	848,000,000	67,000,000	59,000,000
Contingent asset		53,000,000	72,000,000
Acquired BIAM assets under management							23,000,000,000			122,000,000,000
Date of acquisition						November 3, 2011			October 3, 2011
Other assets		$ 17,139,000,000	$ 13,841,000,000	$ 564,000,000,000

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Investment Securities (Narrative) (Details) (USD $)	12 Months Ended
Dec. 31, 2011 securities	Dec. 31, 2010
Aggregate investment securities carried	$ 44,660,000,000		$ 44,810,000,000
Recovery of claimed amounts	20.00%
Gross pre-tax unrealized losses on securities	1,960,000,000
Number of investment securities	1,703
Credit-related other-than-temporary impairment	73,000,000
Available for sale, Amortized Cost	100,013,000,000		82,329,000,000
Proceeds from sale of securities			11,000,000,000
Pre-tax net loss on sale of securities			344,000,000
Securities sold included as held to maturity	4,800,000,000
Net pre-tax loss on sale of held-to-maturity securities	119,000,000
Unrealized loss on available-for-sale securities	1,652,000,000		1,574,000,000
Number of peripheral European countries	5
Asset-Backed Securities [Member]
Available for sale, Amortized Cost	32,905,000,000		27,264,000,000
Proceeds from sale of securities			4,300,000,000
Unrealized loss on available-for-sale securities	1,297,000,000		1,185,000,000
Non-Agency Mortgage Backed Securities [Member]
Proceeds from sale of securities			4,100,000,000
Mortgage-Backed Securities [Member]
Proceeds from sale of securities			2,500,000,000
Federal Family Education Loan Program [Member]
Federal government credit support guarantee, percentage minimum	97.00%
Collective credit support, percentage minimum	100.00%
Student Loans [Member]
Available for sale, Amortized Cost	17,187,000,000	[1]	14,975,000,000	[1]
Total exposure to asset backed Securities	1,000,000,000
Unrealized loss on available-for-sale securities	711,000,000	[1]	652,000,000	[1]
European Periphery [Member]
Total exposure to asset backed Securities	1,080,000,000
Unrealized loss on available-for-sale securities	122,000,000
Spain [Member]
Total exposure to asset backed Securities	424,000,000
Italy [Member]
Total exposure to asset backed Securities	373,000,000
Greece [Member]
Total exposure to asset backed Securities	99,000,000
Ireland [Member]
Total exposure to asset backed Securities	114,000,000
Portugal [Member]
Total exposure to asset backed Securities	$ 69,000,000
Maximum [Member]
Percentage change in additional house price declines	15.00%
Minimum [Member]
Percentage change in additional house price declines	5.00%
[1]	Substantially composed of securities guaranteed by the federal government with respect to the payment of principal and interest.

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Investment Securities (Schedule Of Marketable Securities) (Details) (USD $) In Millions, unless otherwise specified	Dec. 31, 2011	Dec. 31, 2010
Available for sale, Amortized Cost	$ 100,013		$ 82,329
Available for sale, Gross Unrealized Gains	1,471		1,126
Available for sale, Gross Unrealized Losses	1,652		1,574
Available for sale, Fair Value	99,832		81,881
Held to maturity, Amortized Cost	9,321		12,249
Held to maturity, Gross Unrealized Gains	344		541
Held to maturity, Gross Unrealized Losses	303		214
Held to maturity, Fair Value	9,362		12,576
Student Loans [Member]
Available for sale, Amortized Cost	17,187	[1]	14,975	[1]
Available for sale, Gross Unrealized Gains	69	[1]	92	[1]
Available for sale, Gross Unrealized Losses	711	[1]	652	[1]
Available for sale, Fair Value	16,545	[1]	14,415	[1]
Credit Cards [Member]
Available for sale, Amortized Cost	10,448		7,578
Available for sale, Gross Unrealized Gains	53		56
Available for sale, Gross Unrealized Losses	14		31
Available for sale, Fair Value	10,487		7,603
Sub-Prime [Member]
Available for sale, Amortized Cost	1,849		2,161
Available for sale, Gross Unrealized Gains	2		3
Available for sale, Gross Unrealized Losses	447		346
Available for sale, Fair Value	1,404		1,818
Other Asset-Backed Securities [Member]
Available for sale, Amortized Cost	3,421		2,550
Available for sale, Gross Unrealized Gains	169		175
Available for sale, Gross Unrealized Losses	125		156
Available for sale, Fair Value	3,465		2,569
Asset-Backed Securities [Member]
Available for sale, Amortized Cost	32,905		27,264
Available for sale, Gross Unrealized Gains	293		326
Available for sale, Gross Unrealized Losses	1,297		1,185
Available for sale, Fair Value	31,901		26,405
State And Political Subdivisions [Member]
Available for sale, Amortized Cost	6,924		6,706
Available for sale, Gross Unrealized Gains	244		102
Available for sale, Gross Unrealized Losses	121		204
Available for sale, Fair Value	7,047		6,604
Held to maturity, Amortized Cost	107		134
Held to maturity, Gross Unrealized Gains	3		3
Held to maturity, Gross Unrealized Losses
Held to maturity, Fair Value	110		137
Collateralized Mortgage Obligations [Member]
Available for sale, Amortized Cost	3,971		1,828
Available for sale, Gross Unrealized Gains	62		49
Available for sale, Gross Unrealized Losses	53		16
Available for sale, Fair Value	3,980		1,861
Held to maturity, Amortized Cost	3,334		4,452
Held to maturity, Gross Unrealized Gains	220		328
Held to maturity, Gross Unrealized Losses	57		44
Held to maturity, Fair Value	3,497		4,736
Other U.S. Debt Securities [Member]
Available for sale, Amortized Cost	3,471		2,438
Available for sale, Gross Unrealized Gains	159		116
Available for sale, Gross Unrealized Losses	15		18
Available for sale, Fair Value	3,615		2,536
U.S. Equity Securities [Member]
Available for sale, Amortized Cost	639		1,115
Available for sale, Gross Unrealized Gains	1
Available for sale, Gross Unrealized Losses
Available for sale, Fair Value	640		1,115
Non-U.S. Equity Securities [Member]
Available for sale, Amortized Cost	118		122
Available for sale, Gross Unrealized Gains			5
Available for sale, Gross Unrealized Losses			1
Available for sale, Fair Value	118		126
U.S. Treasury And Federal Agencies [Member] | Direct Obligations [Member]
Available for sale, Amortized Cost	2,798		7,505
Available for sale, Gross Unrealized Gains	39		74
Available for sale, Gross Unrealized Losses	1		2
Available for sale, Fair Value	2,836		7,577
U.S. Treasury And Federal Agencies [Member] | Asset-Backed Securities [Member]
Held to maturity, Amortized Cost	31		64
Held to maturity, Gross Unrealized Gains
Held to maturity, Gross Unrealized Losses	2		5
Held to maturity, Fair Value	29		59
U.S. Treasury And Federal Agencies [Member] | Mortgage-Backed Securities [Member]
Available for sale, Amortized Cost	29,511		23,398
Available for sale, Gross Unrealized Gains	538		325
Available for sale, Gross Unrealized Losses	28		83
Available for sale, Fair Value	30,021		23,640
Held to maturity, Amortized Cost	265		413
Held to maturity, Gross Unrealized Gains	18		26
Held to maturity, Fair Value	283		439
Non-U.S. Debt Securities [Member]
Available for sale, Amortized Cost	19,676		11,953
Available for sale, Gross Unrealized Gains	135		129
Available for sale, Gross Unrealized Losses	137		65
Available for sale, Fair Value	19,674		12,017
Held to maturity, Amortized Cost	5,584		7,186
Held to maturity, Gross Unrealized Gains	103		184
Held to maturity, Gross Unrealized Losses	244		165
Held to maturity, Fair Value	5,443		7,205
Non-U.S. Debt Securities [Member] | Asset-Backed Securities [Member]
Available for sale, Amortized Cost	4,318		1,790
Available for sale, Gross Unrealized Gains	2		13
Available for sale, Gross Unrealized Losses	17		17
Available for sale, Fair Value	4,303		1,786
Held to maturity, Amortized Cost	436		646
Held to maturity, Gross Unrealized Gains	16		18
Held to maturity, Gross Unrealized Losses	3		3
Held to maturity, Fair Value	449		661
Non-U.S. Debt Securities [Member] | Other Non-U.S. Debt Securities [Member]
Available for sale, Amortized Cost	2,797		1,900
Available for sale, Gross Unrealized Gains	41		34
Available for sale, Gross Unrealized Losses	13		2
Available for sale, Fair Value	2,825		1,932
Held to maturity, Amortized Cost	172		208
Held to maturity, Gross Unrealized Gains
Held to maturity, Gross Unrealized Losses	17		2
Held to maturity, Fair Value	155		206
Non-U.S. Debt Securities [Member] | Government Securities [Member]
Available for sale, Amortized Cost	1,671		2,005
Available for sale, Gross Unrealized Gains
Available for sale, Gross Unrealized Losses
Available for sale, Fair Value	1,671		2,005
Held to maturity, Amortized Cost	3
Held to maturity, Fair Value	3
Non-U.S. Debt Securities [Member] | Mortgage-Backed Securities [Member]
Available for sale, Amortized Cost	10,890		6,258
Available for sale, Gross Unrealized Gains	92		82
Available for sale, Gross Unrealized Losses	107		46
Available for sale, Fair Value	10,875		6,294
Held to maturity, Amortized Cost	4,973		6,332
Held to maturity, Gross Unrealized Gains	87		166
Held to maturity, Gross Unrealized Losses	224		160
Held to maturity, Fair Value	$ 4,836		$ 6,338
[1]	Substantially composed of securities guaranteed by the federal government with respect to the payment of principal and interest.

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Investment Securities (Schedule Of Contractual Maturities Of Debt Securities) (Details) (USD $) In Millions, unless otherwise specified	Dec. 31, 2011
Available for sale, Under 1 Year	$ 8,805
Available for sale, 1 to 5 Years	20,813
Available for sale, 6 to 10 Years	34,264
Available for sale, Over 10 Years	35,192
Held to maturity, Under 1 Year	1,757
Held to maturity, 1 to 5 Years	2,031
Held to maturity, 6 to 10 Years	851
Held to maturity, Over 10 Years	4,682
Student Loans [Member]
Available for sale, Under 1 Year	155
Available for sale, 1 to 5 Years	3,331
Available for sale, 6 to 10 Years	8,490
Available for sale, Over 10 Years	4,569
Credit Cards [Member]
Available for sale, Under 1 Year	1,893
Available for sale, 1 to 5 Years	5,893
Available for sale, 6 to 10 Years	2,701
Sub-Prime [Member]
Available for sale, Under 1 Year	581
Available for sale, 1 to 5 Years	82
Available for sale, 6 to 10 Years	17
Available for sale, Over 10 Years	724
Other Asset-Backed Securities [Member]
Available for sale, Under 1 Year	119
Available for sale, 1 to 5 Years	1,602
Available for sale, 6 to 10 Years	1,198
Available for sale, Over 10 Years	546
Asset-Backed Securities [Member]
Available for sale, Under 1 Year	2,748
Available for sale, 1 to 5 Years	10,908
Available for sale, 6 to 10 Years	12,406
Available for sale, Over 10 Years	5,839
State And Political Subdivisions [Member]
Available for sale, Under 1 Year	471
Available for sale, 1 to 5 Years	2,326
Available for sale, 6 to 10 Years	3,328
Available for sale, Over 10 Years	922
Held to maturity, Under 1 Year	56
Held to maturity, 1 to 5 Years	49
Held to maturity, 6 to 10 Years	2
Collateralized Mortgage Obligations [Member]
Available for sale, Under 1 Year	81
Available for sale, 1 to 5 Years	1,163
Available for sale, 6 to 10 Years	1,209
Available for sale, Over 10 Years	1,527
Held to maturity, Under 1 Year	394
Held to maturity, 1 to 5 Years	1,350
Held to maturity, 6 to 10 Years	530
Held to maturity, Over 10 Years	1,060
Other U.S. Debt Securities [Member]
Available for sale, Under 1 Year	289
Available for sale, 1 to 5 Years	1,391
Available for sale, 6 to 10 Years	1,899
Available for sale, Over 10 Years	36
U.S. Treasury And Federal Agencies [Member] | Direct Obligations [Member]
Available for sale, Under 1 Year	1,200
Available for sale, 1 to 5 Years	38
Available for sale, 6 to 10 Years	822
Available for sale, Over 10 Years	776
U.S. Treasury And Federal Agencies [Member] | Mortgage-Backed Securities [Member]
Available for sale, Under 1 Year	5
Available for sale, 1 to 5 Years	755
Available for sale, 6 to 10 Years	10,871
Available for sale, Over 10 Years	18,390
Held to maturity, 1 to 5 Years	19
Held to maturity, 6 to 10 Years	102
Held to maturity, Over 10 Years	144
U.S. Treasury And Federal Agencies [Member] | Asset-Backed Securities [Member]
Held to maturity, Over 10 Years	31
Non-U.S. Debt Securities [Member]
Available for sale, Under 1 Year	4,011
Available for sale, 1 to 5 Years	4,232
Available for sale, 6 to 10 Years	3,729
Available for sale, Over 10 Years	7,702
Held to maturity, Under 1 Year	1,307
Held to maturity, 1 to 5 Years	613
Held to maturity, 6 to 10 Years	217
Held to maturity, Over 10 Years	3,447
Non-U.S. Debt Securities [Member] | Mortgage-Backed Securities [Member]
Available for sale, Under 1 Year	474
Available for sale, 1 to 5 Years	2,358
Available for sale, 6 to 10 Years	987
Available for sale, Over 10 Years	7,056
Held to maturity, Under 1 Year	1,304
Held to maturity, 1 to 5 Years	254
Held to maturity, Over 10 Years	3,415
Non-U.S. Debt Securities [Member] | Asset-Backed Securities [Member]
Available for sale, Under 1 Year	230
Available for sale, 1 to 5 Years	916
Available for sale, 6 to 10 Years	2,511
Available for sale, Over 10 Years	646
Held to maturity, 1 to 5 Years	204
Held to maturity, 6 to 10 Years	217
Held to maturity, Over 10 Years	15
Non-U.S. Debt Securities [Member] | Government Securities [Member]
Available for sale, Under 1 Year	1,671
Held to maturity, Under 1 Year	3
Non-U.S. Debt Securities [Member] | Other Non-U.S. Debt Securities [Member]
Available for sale, Under 1 Year	1,636
Available for sale, 1 to 5 Years	958
Available for sale, 6 to 10 Years	231
Held to maturity, 1 to 5 Years	155
Held to maturity, Over 10 Years	$ 17

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Investment Securities (Critical Estimates Used In Roll Rate Analysis) (Details)	Dec. 31, 2011	Dec. 31, 2010
Sub-Prime [Member]
Cumulative loss estimates			33.00%
Loss severity			67.00%	[1]
Peak-to-trough housing price decline	35.00%	[2]
Alt-A [Member]
Prepayment rate			7.00%
Cumulative loss estimates			21.00%
Loss severity			49.00%	[1]
Peak-to-trough housing price decline	35.00%	[2]
Non-Agency Prime [Member]
Cumulative loss estimates			13.00%
Loss severity			49.00%	[1]
Peak-to-trough housing price decline	35.00%	[2]
Maximum [Member] | Sub-Prime [Member]
Prepayment rate	3.00%		3.00%
Cumulative loss estimates	54.00%
Loss severity	72.00%
Peak-to-trough housing price decline			40.00%
Maximum [Member] | Alt-A [Member]
Prepayment rate	6.00%
Cumulative loss estimates	39.00%
Loss severity	61.00%
Peak-to-trough housing price decline			40.00%
Maximum [Member] | Non-Agency Prime [Member]
Prepayment rate	10.00%		10.00%
Cumulative loss estimates	19.00%
Loss severity	53.00%
Peak-to-trough housing price decline			40.00%
Minimum [Member] | Sub-Prime [Member]
Prepayment rate	1.00%		2.00%
Cumulative loss estimates	46.00%
Loss severity	70.00%
Peak-to-trough housing price decline			35.00%
Minimum [Member] | Alt-A [Member]
Prepayment rate	2.00%
Cumulative loss estimates	26.00%
Loss severity	59.00%
Peak-to-trough housing price decline			35.00%
Minimum [Member] | Non-Agency Prime [Member]
Prepayment rate	5.00%		7.00%
Cumulative loss estimates	9.00%
Loss severity	52.00%
Peak-to-trough housing price decline			35.00%
[1]	Loss severity rates consider the initial loan-to-value ratio, lien position, geography, expected collateral value and other factors.
[2]	Management's expectation of the Case-Shiller National Home Price Index.

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Investment Securities (Other-Than-Temporary Impairment Recorded On Securities) (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Other-than-temporary impairment recorded on securities	$ 73
2006 And 2007 Vintage US Residential Mortgage Backed Securities [Member]
Other-than-temporary impairment recorded on securities	12	158	109	[1]
2006 And 2007 Vintage US Residential Mortgage Backed Securities [Member] | Sub-Prime [Member]
Other-than-temporary impairment recorded on securities	2	26	29	[1]
2006 And 2007 Vintage US Residential Mortgage Backed Securities [Member] | Alt-A [Member]
Other-than-temporary impairment recorded on securities	5	43	20	[1]
2006 And 2007 Vintage US Residential Mortgage Backed Securities [Member] | Non-Agency Prime [Member]
Other-than-temporary impairment recorded on securities	$ 5	$ 89	$ 60	[1]
[1]	Represents the period from April 1, 2009 through December 31, 2009, subsequent to the adoption of the revised GAAP related to other-than-temporary impairment.

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Investment Securities (Schedule Of Gross Pre-Tax Unrealized Losses On Investment Securities) (Details) (USD $) In Millions, unless otherwise specified	Dec. 31, 2011	Dec. 31, 2010
Student Loans [Member]
Available for sale, Fair Value Less than 12 Months	$ 2,642	$ 1,980
Available for sale, Gross Unrealized Losses Less than 12 Months	23	25
Available for sale, Fair Value 12 Months or Longer	10,706	8,457
Available for sale, Gross Unrealized Losses 12 Months or Longer	688	627
Available for sale, Fair Value Total	13,348	10,437
Available for sale, Gross Unrealized Losses Total	711	652
Credit Cards [Member]
Available for sale, Fair Value Less than 12 Months	2,581	1,268
Available for sale, Gross Unrealized Losses Less than 12 Months	6	5
Available for sale, Fair Value 12 Months or Longer	1,461	2,396
Available for sale, Gross Unrealized Losses 12 Months or Longer	8	26
Available for sale, Fair Value Total	4,042	3,664
Available for sale, Gross Unrealized Losses Total	14	31
Sub-Prime [Member]
Available for sale, Fair Value Less than 12 Months	16
Available for sale, Gross Unrealized Losses Less than 12 Months	1
Available for sale, Fair Value 12 Months or Longer	1,360	1,769
Available for sale, Gross Unrealized Losses 12 Months or Longer	446	346
Available for sale, Fair Value Total	1,376	1,769
Available for sale, Gross Unrealized Losses Total	447	346
Other Asset-Backed Securities [Member]
Available for sale, Fair Value Less than 12 Months	1,482	269
Available for sale, Gross Unrealized Losses Less than 12 Months	19	3
Available for sale, Fair Value 12 Months or Longer	1,122	1,122
Available for sale, Gross Unrealized Losses 12 Months or Longer	106	153
Available for sale, Fair Value Total	2,604	1,391
Available for sale, Gross Unrealized Losses Total	125	156
Asset-Backed Securities [Member]
Available for sale, Fair Value Less than 12 Months	6,721	3,517
Available for sale, Gross Unrealized Losses Less than 12 Months	49	33
Available for sale, Fair Value 12 Months or Longer	14,649	13,744
Available for sale, Gross Unrealized Losses 12 Months or Longer	1,248	1,152
Available for sale, Fair Value Total	21,370	17,261
Available for sale, Gross Unrealized Losses Total	1,297	1,185
Held to maturity, Fair Value 12 Months or Longer	29	53
Held to maturity, Gross Unrealized Losses 12 Months or Longer	2	5
Held to maturity, Fair Value Total	29	53
Held to maturity, Gross Unrealized Losses Total	2	5
State And Political Subdivisions [Member]
Available for sale, Fair Value Less than 12 Months	171	1,097
Available for sale, Gross Unrealized Losses Less than 12 Months	3	19
Available for sale, Fair Value 12 Months or Longer	1,446	1,967
Available for sale, Gross Unrealized Losses 12 Months or Longer	118	185
Available for sale, Fair Value Total	1,617	3,064
Available for sale, Gross Unrealized Losses Total	121	204
Collateralized Mortgage Obligations [Member]
Available for sale, Fair Value Less than 12 Months	2,024	494
Available for sale, Gross Unrealized Losses Less than 12 Months	43	5
Available for sale, Fair Value 12 Months or Longer	68	109
Available for sale, Gross Unrealized Losses 12 Months or Longer	10	11
Available for sale, Fair Value Total	2,092	603
Available for sale, Gross Unrealized Losses Total	53	16
Held to maturity, Fair Value Less than 12 Months	649	125
Held to maturity, Gross Unrealized Losses Less than 12 Months	32	2
Held to maturity, Fair Value 12 Months or Longer	231	575
Held to maturity, Gross Unrealized Losses 12 Months or Longer	25	42
Held to maturity, Fair Value Total	880	700
Held to maturity, Gross Unrealized Losses Total	57	44
Other U.S. Debt Securities [Member]
Available for sale, Fair Value Less than 12 Months	220	330
Available for sale, Gross Unrealized Losses Less than 12 Months	2	7
Available for sale, Fair Value 12 Months or Longer	57	61
Available for sale, Gross Unrealized Losses 12 Months or Longer	13	11
Available for sale, Fair Value Total	277	391
Available for sale, Gross Unrealized Losses Total	15	18
Total AFS Securities [Member]
Available for sale, Fair Value Less than 12 Months	25,040	15,054
Available for sale, Gross Unrealized Losses Less than 12 Months	206	170
Available for sale, Fair Value 12 Months or Longer	17,849	16,889
Available for sale, Gross Unrealized Losses 12 Months or Longer	1,446	1,404
Available for sale, Fair Value Total	42,889	31,943
Available for sale, Gross Unrealized Losses Total	1,652	1,574
Total HTM Securities [Member]
Held to maturity, Fair Value Less than 12 Months	999	1,776
Held to maturity, Gross Unrealized Losses Less than 12 Months	39	76
Held to maturity, Fair Value 12 Months or Longer	1,850	1,558
Held to maturity, Gross Unrealized Losses 12 Months or Longer	264	138
Held to maturity, Fair Value Total	2,849	3,334
Held to maturity, Gross Unrealized Losses Total	303	214
Non-U.S. Equity Securities [Member]
Available for sale, Fair Value Less than 12 Months		8
Available for sale, Gross Unrealized Losses Less than 12 Months		1
Available for sale, Fair Value 12 Months or Longer
Available for sale, Gross Unrealized Losses 12 Months or Longer
Available for sale, Fair Value Total		8
Available for sale, Gross Unrealized Losses Total		1
U.S. Treasury And Federal Agencies [Member] | Direct Obligations [Member]
Available for sale, Fair Value Less than 12 Months	1,373
Available for sale, Gross Unrealized Losses Less than 12 Months	1
Available for sale, Fair Value 12 Months or Longer		153
Available for sale, Gross Unrealized Losses 12 Months or Longer		2
Available for sale, Fair Value Total	1,373	153
Available for sale, Gross Unrealized Losses Total	1	2
U.S. Treasury And Federal Agencies [Member] | Mortgage-Backed Securities [Member]
Available for sale, Fair Value Less than 12 Months	4,714	6,639
Available for sale, Gross Unrealized Losses Less than 12 Months	26	81
Available for sale, Fair Value 12 Months or Longer	370	431
Available for sale, Gross Unrealized Losses 12 Months or Longer	2	2
Available for sale, Fair Value Total	5,084	7,070
Available for sale, Gross Unrealized Losses Total	28	83
Non-U.S. Debt Securities [Member]
Available for sale, Fair Value Less than 12 Months	9,817	2,969
Available for sale, Gross Unrealized Losses Less than 12 Months	82	24
Available for sale, Fair Value 12 Months or Longer	1,259	424
Available for sale, Gross Unrealized Losses 12 Months or Longer	55	41
Available for sale, Fair Value Total	11,076	3,393
Available for sale, Gross Unrealized Losses Total	137	65
Held to maturity, Fair Value Less than 12 Months	350	1,651
Held to maturity, Gross Unrealized Losses Less than 12 Months	7	74
Held to maturity, Fair Value 12 Months or Longer	1,590	930
Held to maturity, Gross Unrealized Losses 12 Months or Longer	237	91
Held to maturity, Fair Value Total	1,840	2,581
Held to maturity, Gross Unrealized Losses Total	244	165
Non-U.S. Debt Securities [Member] | Mortgage-Backed Securities [Member]
Available for sale, Fair Value Less than 12 Months	6,069	2,621
Available for sale, Gross Unrealized Losses Less than 12 Months	55	22
Available for sale, Fair Value 12 Months or Longer	1,151	370
Available for sale, Gross Unrealized Losses 12 Months or Longer	52	24
Available for sale, Fair Value Total	7,220	2,991
Available for sale, Gross Unrealized Losses Total	107	46
Held to maturity, Fair Value Less than 12 Months	341	1,445
Held to maturity, Gross Unrealized Losses Less than 12 Months	6	72
Held to maturity, Fair Value 12 Months or Longer	1,382	862
Held to maturity, Gross Unrealized Losses 12 Months or Longer	218	88
Held to maturity, Fair Value Total	1,723	2,307
Held to maturity, Gross Unrealized Losses Total	224	160
Non-U.S. Debt Securities [Member] | Other Non-U.S. Debt Securities [Member]
Available for sale, Fair Value Less than 12 Months	1,543	348
Available for sale, Gross Unrealized Losses Less than 12 Months	13	2
Available for sale, Fair Value 12 Months or Longer
Available for sale, Gross Unrealized Losses 12 Months or Longer
Available for sale, Fair Value Total	1,543	348
Available for sale, Gross Unrealized Losses Total	13	2
Held to maturity, Fair Value Less than 12 Months		206
Held to maturity, Gross Unrealized Losses Less than 12 Months		2
Held to maturity, Fair Value 12 Months or Longer	138
Held to maturity, Gross Unrealized Losses 12 Months or Longer	17
Held to maturity, Fair Value Total	138	206
Held to maturity, Gross Unrealized Losses Total	17	2
Non-U.S. Debt Securities [Member] | Asset-Backed Securities [Member]
Available for sale, Fair Value Less than 12 Months	2,205
Available for sale, Gross Unrealized Losses Less than 12 Months	14
Available for sale, Fair Value 12 Months or Longer	108	54
Available for sale, Gross Unrealized Losses 12 Months or Longer	3	17
Available for sale, Fair Value Total	2,313	54
Available for sale, Gross Unrealized Losses Total	17	17
Held to maturity, Fair Value Less than 12 Months	9
Held to maturity, Gross Unrealized Losses Less than 12 Months	1
Held to maturity, Fair Value 12 Months or Longer	70	68
Held to maturity, Gross Unrealized Losses 12 Months or Longer	2	3
Held to maturity, Fair Value Total	79	68
Held to maturity, Gross Unrealized Losses Total	$ 3	$ 3

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Investment Securities (Gains And Losses Related To Investment Securities) (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Investment Securities [Abstract]
Gross realized gains from sales of investment securities	$ 152		$ 1,330		$ 418
Gross realized losses from sales of investment securities	(12)		(1,385)		(50)
Losses from other-than-temporary impairment	(123)		(651)		(1,155)
Losses not related to credit	50	[1]	420	[1]	928	[1]
Gains (Losses) related to investment securities, net	67		(286)		141
Impairment associated with expected credit losses	(42)		(203)		(151)
Impairment associated with management's intent to sell the impaired securities prior to their recovery in value	(8)		(1)		(54)
Impairment associated with adverse changes in timing of expected future cash flows	(23)		(27)		(22)
Net impairment losses	$ (73)		$ (231)		$ (227)
[1]	Pursuant to revised GAAP adopted on April 1, 2009, these losses were recorded, net of related taxes, a component of other comprehensive income; refer to note 12.

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Investment Securities (Schedule Of Credit-Related Loss Activity Recognized In Earnings) (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Investment Securities [Abstract]
Beginning balance	$ 63	$ 175	[1]
Plus expected credit-related losses for which other-than-temporary impairment was not previously recognized	10	88		214	[1]
Plus expected credit-related losses for which other-than-temporary impairment was previously recognized	55	142
Less losses realized for securities sold	(13)	(342)		(17)	[1]
Less losses related to securities intended or required to be sold	(2)			(22)	[1]
Ending balance	$ 113	$ 63		$ 175	[1]
[1]	Beginning balance was as of April 1, 2009, pursuant to revised GAAP.

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Loans And Leases (Narrative) (Details) (USD $)	12 Months Ended
Dec. 31, 2011 days	Dec. 31, 2010 days
Aggregate short-duration advances	2,170,000,000	2,630,000,000
Aggregate of debt restructurings	199,000,000	307,000,000
Non-accrual status principal interest payments past due days	60
Other real estate owned	79,000,000
Property Development Acquired-Credit Impaired [Member]
Other real estate owned	42,000,000
Troubled Debt Restructuring [Member]
Aggregate of debt restructurings
Commercial Real Estate [Member]
Loans or leases contractually past-due days	90	90
Institutional [Member]
Loans or leases contractually past-due days	90	90

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Loans And Leases (Net Loans) (Details) (USD $) In Millions, unless otherwise specified	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009	Dec. 31, 2008
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans and leases	$ 10,053	$ 11,957
Allowance for loan losses	(22)	(100)	(79)	(18)
Loans and leases, net of allowance for loan losses	10,031	11,857
U.S. [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Investment funds	5,592	5,316
Commercial and financial	563	540
Commercial real estate	460	764
Purchased receivables	563	728
Lease financing	397	417
Non-U.S. [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Investment funds	796	1,478
Commercial and financial	453	190
Purchased receivables	372	1,471
Lease financing	857	1,053
Institutional [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans and leases	9,593	11,193
Allowance for loan losses	(22)	(31)
Commercial Real Estate [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans and leases	460	764
Allowance for loan losses		$ (69)

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Loans And leases (Components Of The Net Investment In Leveraged Leases) (Details) (USD $) In Millions, unless otherwise specified	Dec. 31, 2011	Dec. 31, 2010
Loans And Leases [Abstract]
Net rental income receivable	$ 1,671	$ 2,187
Estimated residual values	110	118
Unearned income	(527)	(835)
Investment in leveraged lease financing	1,254	1,470
Less related deferred income tax liabilities	(397)	(463)
Net investment in leveraged lease financing	$ 857	$ 1,007

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Loans And Leases (Recorded Investment In Each Class Of Total Loans And Leases By Credit Quality Indicator) (Details) (USD $) In Millions, unless otherwise specified	Dec. 31, 2011	Dec. 31, 2010
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans and Leases	$ 10,053	$ 11,957
Institutional [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans and Leases	9,593	11,193
Commercial Real Estate [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans and Leases	460	764
Investment Funds [Member] | Institutional [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans and Leases	6,388	6,794
Commercial And Financial [Member] | Institutional [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans and Leases	1,016	730
Purchased Receivables [Member] | Institutional [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans and Leases	935	2,199
Lease Financing [Member] | Institutional [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans and Leases	1,254	1,470
Property Development [Member] | Commercial Real Estate [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans and Leases	380	451
Property Development Acquired-Credit Impaired [Member] | Commercial Real Estate [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans and Leases		42
Other Acquired Credit-Impaired [Member] | Commercial Real Estate [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans and Leases	39	99
Other [Member] | Commercial Real Estate [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans and Leases	41	172
Investment Grade [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans and Leases	9,102	10,786
Investment Grade [Member] | Investment Funds [Member] | Institutional [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans and Leases	6,341	6,674
Investment Grade [Member] | Commercial And Financial [Member] | Institutional [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans and Leases	592	579
Investment Grade [Member] | Purchased Receivables [Member] | Institutional [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans and Leases	935	2,199
Investment Grade [Member] | Lease Financing [Member] | Institutional [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans and Leases	1,194	1,279
Investment Grade [Member] | Property Development [Member] | Commercial Real Estate [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans and Leases	1	3
Investment Grade [Member] | Other Acquired Credit-Impaired [Member] | Commercial Real Estate [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans and Leases	3	3
Investment Grade [Member] | Other [Member] | Commercial Real Estate [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans and Leases	36	49
Speculative [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans and Leases	946	929
Speculative [Member] | Investment Funds [Member] | Institutional [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans and Leases	47	120
Speculative [Member] | Commercial And Financial [Member] | Institutional [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans and Leases	424	101
Speculative [Member] | Lease Financing [Member] | Institutional [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans and Leases	60	191
Speculative [Member] | Property Development [Member] | Commercial Real Estate [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans and Leases	379	362
Speculative [Member] | Other Acquired Credit-Impaired [Member] | Commercial Real Estate [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans and Leases	31	47
Speculative [Member] | Other [Member] | Commercial Real Estate [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans and Leases	5	108
Substandard [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans and Leases		50
Substandard [Member] | Commercial And Financial [Member] | Institutional [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans and Leases		50
Doubtful [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans and Leases	5	192
Doubtful [Member] | Property Development [Member] | Commercial Real Estate [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans and Leases		86
Doubtful [Member] | Property Development Acquired-Credit Impaired [Member] | Commercial Real Estate [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans and Leases		42
Doubtful [Member] | Other Acquired Credit-Impaired [Member] | Commercial Real Estate [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans and Leases	5	49
Doubtful [Member] | Other [Member] | Commercial Real Estate [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans and Leases		$ 15

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Loans And Leases (Schedule Of Allowance For Loan Losses) (Details) (USD $) In Millions, unless otherwise specified	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009	Dec. 31, 2008
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans and leases	$ 10,053	$ 11,957
Total allowance for loan losses	22	100	79	18
Institutional [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans and leases	9,593	11,193
Total allowance for loan losses	22	31
Commercial Real Estate [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans and leases	460	764
Total allowance for loan losses		69
Loans And Leases [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Individually evaluated for impairment	477	735
Collectively evaluated for impairment	9,537	11,081
Loans acquired with deteriorated credit quality	39	141
Loans And Leases [Member] | Institutional [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Individually evaluated for impairment	56	112
Collectively evaluated for impairment	9,537	11,081
Loans And Leases [Member] | Commercial Real Estate [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Individually evaluated for impairment	421	623
Loans acquired with deteriorated credit quality	39	141
Allowance For Loan Losses [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Individually evaluated for impairment		24
Collectively evaluated for impairment	22	31
Loans acquired with deteriorated credit quality		45
Allowance For Loan Losses [Member] | Institutional [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Collectively evaluated for impairment	22	31
Allowance For Loan Losses [Member] | Commercial Real Estate [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Individually evaluated for impairment		24
Loans acquired with deteriorated credit quality		$ 45

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Loans And Leases (Impaired Loans) (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
Dec. 31, 2011	Dec. 31, 2010
Accounts, Notes, Loans and Financing Receivable [Line Items]
Recorded Investment	$ 238	$ 463
Unpaid Principal Balance	367	619
Related Allowance		69	[1]
Average Recorded Investment	243
Interest Revenue Recognized	16
Additional allowance for loan losses	22	31
With No Related Allowance Recorded [Member] | CRE-Property Development [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Recorded Investment	199	209
Unpaid Principal Balance	227	240
Average Recorded Investment	200
Interest Revenue Recognized	15
With No Related Allowance Recorded [Member] | CRE-Property Development - Acquired Credit-Impaired [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Unpaid Principal Balance	34	34
With No Related Allowance Recorded [Member] | CRE-Other-Acquired Credit-Impaired [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Recorded Investment	8	16
Unpaid Principal Balance	69	47
Average Recorded Investment	12
With No Related Allowance Recorded [Member] | CRE-Other [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Recorded Investment		27
Unpaid Principal Balance		29
With An Allowance Recorded [Member] | CRE-Property Development [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Recorded Investment		79
Unpaid Principal Balance		113
Related Allowance		24	[1]
With An Allowance Recorded [Member] | CRE-Property Development - Acquired Credit-Impaired [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Recorded Investment		42
Unpaid Principal Balance		47
Related Allowance		19	[1]
With An Allowance Recorded [Member] | CRE-Other-Acquired Credit-Impaired [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Recorded Investment	31	83
Unpaid Principal Balance	37	100
Related Allowance		26	[1]
Average Recorded Investment	31
Interest Revenue Recognized	1
With An Allowance Recorded [Member] | CRE-Other [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Recorded Investment		7
Unpaid Principal Balance		$ 9
[1]	As of December 31, 2011 and December 31, 2010, we maintained allowances for loan losses of $22 million and $31 million, respectively, associated with loans and leases that were not impaired.

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Loans And Leases (Financing Receivables On Non-Accrual Status) (Details) (USD $) In Millions, unless otherwise specified	Dec. 31, 2011	Dec. 31, 2010
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and leases receivable, recorded investment on non-accrual status	$ 5	$ 158
Property Development [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and leases receivable, recorded investment on non-accrual status		79
Property Development Acquired-Credit Impaired [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and leases receivable, recorded investment on non-accrual status		42
Other Acquired Credit-Impaired [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and leases receivable, recorded investment on non-accrual status	5	22
Other [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and leases receivable, recorded investment on non-accrual status		$ 15

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Loans And Leases (Schedule Of Activity In The Allowance For Loan Losses) (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Accounts, Notes, Loans and Financing Receivable [Line Items]
Beginning balance	$ 100	$ 79	$ 18
Charge-offs	(78)	(4)	(91)
Provisions		25	149
Recoveries			3
Ending balance	22	100	79
Institutional [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Beginning balance	31
Provisions	(9)
Ending balance	22
Commercial Real Estate [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Beginning balance	69
Charge-offs	(78)
Provisions	$ 9

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Goodwill And Other Intangible Assets (Narrative) (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Goodwill And Other Intangible Assets [Abstract]
Amortization expense related to other intangible assets	$ 200	$ 179	$ 136
Expected amortization expense of other intangible assets for 2012	214
Expected amortization expense of other intangible assets for 2013	212
Expected amortization expense of other intangible assets for 2014	205
Expected amortization expense of other intangible assets for 2015	190
Expected amortization expense of other intangible assets for 2016	$ 178

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Goodwill And Other Intangible Assets (Changes In The Carrying Amount Of Goodwill) (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2011 Investment Servicing [Member]	Dec. 31, 2010 Investment Servicing [Member]	Dec. 31, 2011 Investment Management [Member]	Dec. 31, 2009 Investment Management [Member]
Goodwill [Line Items]
Beginning balance	$ 5,597	$ 4,550	$ 5,591	$ 4,544	$ 6	$ 6
Acquisitions	100	1,005	68	1,005	32
Foreign currency translation, net	(52)	42	(49)	42	(3)
Ending balance	$ 5,645	$ 5,597	$ 5,610	$ 5,591	$ 35	$ 6

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Goodwill And Other Intangible Assets (Changes In The Carrying Amount Of Other Intangible Assets) (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Goodwill [Line Items]
Beginning balance	$ 2,593	$ 1,810
Acquisitions	96	969
Amortization	(200)	(179)	(136)
Foreign currency translation, net	(30)	(7)
Ending balance	2,459	2,593	1,810
Investment Servicing [Member]
Goodwill [Line Items]
Beginning balance	2,559	1,760
Acquisitions	67	969
Amortization	(189)	(170)
Foreign currency translation, net	(29)	(6)
Other		6
Ending balance	2,408	2,559
Investment Management [Member]
Goodwill [Line Items]
Beginning balance	34	50
Acquisitions	29
Amortization	(11)	(9)
Foreign currency translation, net	(1)	(1)
Other		(6)
Ending balance	$ 51	$ 34

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Goodwill And Other Intangible Assets (Gross Carrying Amount, Accumulated Amortization And Net Carrying Amount Of Other Intangible Assets) (Details) (USD $) In Millions, unless otherwise specified	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Goodwill [Line Items]
Gross Carrying Amount	$ 3,304	$ 3,271
Accumulated Amortization	(845)	(678)
Net Carrying Amount	2,459	2,593	1,810
Customer Relationships [Member]
Goodwill [Line Items]
Gross Carrying Amount	2,369	2,341
Accumulated Amortization	(641)	(520)
Net Carrying Amount	1,728	1,821
Core Deposits Intangibles [Member]
Goodwill [Line Items]
Gross Carrying Amount	702	710
Accumulated Amortization	(117)	(83)
Net Carrying Amount	585	627
Other Intangible Assets [Member]
Goodwill [Line Items]
Gross Carrying Amount	233	220
Accumulated Amortization	(87)	(75)
Net Carrying Amount	$ 146	$ 145

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Other Assets (Components Of Other Assets) (Details) (USD $) In Millions, unless otherwise specified	Dec. 31, 2011	Dec. 31, 2010	Jun. 30, 2010
Income taxes receivable	$ 1,822		$ 1,733
Deferred tax assets, net of valuation allowance	1,249		1,786
Total	17,139		13,841		564,000
Real Estate Acquired Through Foreclosure	79
Other Assets [Member]
Real Estate Acquired Through Foreclosure	75
Reported Amount [Member] | Other Assets [Member]
Collateral deposits	6,688		3,251
Unrealized gains on derivative financial instruments	6,366		5,255
Investments in joint ventures and other unconsolidated entities	1,060		927
Income taxes receivable	989		530
Accounts receivable	431		290
Deferred tax assets, net of valuation allowance	395	[1]	1,786	[1]
Prepaid expenses	308		382
Receivable for securities sold			122
Other	$ 902	[2]	$ 1,298	[2]
[1]	Deferred tax assets as of December 31, 2011 are net of deferred tax liabilities within the same tax jurisdiction.
[2]	Amount for 2011 included other real estate owned of approximately $75 million.

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Deposits (Narrative) (Details) (USD $)	12 Months Ended
Dec. 31, 2011	Dec. 31, 2010
Deposits [Abstract]
Time deposits outstanding	$ 8,900,000,000	$ 9,030,000,000
Non-U.S. time deposits	2,560,000,000	2,210,000,000
The minimum amount of U.S. and non-U.S. time deposits	$ 100,000

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Deposits (Scheduled Maturities Of Aggregate U.S. And Non-U.S. Time Deposits) (Details) (USD $) In Millions, unless otherwise specified	Dec. 31, 2011
Deposits [Abstract]
2012	$ 8,862
2013
2014
2015
2016	40
Total	$ 8,902

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Deposits (Scheduled Maturities Of U.S. Time Deposits) (Details) (USD $) In Millions, unless otherwise specified	Dec. 31, 2011
Deposits [Abstract]
3 months or less	$ 6,141
4 months to a year	161
Over a year	40
Total	$ 6,342

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Short-Term Borrowings (Narrative) (Details)	12 Months Ended
Dec. 31, 2011 USD ($)	Dec. 31, 2011 CAD	Dec. 31, 2010 USD ($)
Short-Term Borrowings [Abstract]
Weighted-average interest rate of short-term borrowings	0.64%		1.10%
Fair value of U.S. government securities	$ 2,980,000,000
Average balances of securities purchased under agreements to resell and securities sold under agreements to repurchase	20,970,000,000		16,270,000,000
Commercial paper authorized	3,000,000,000
Commercial paper maturity period, days	270
Commercial paper, outstanding	2,380,000,000		2,800,000,000
Bank notes authorized	5,000,000,000
Subordinated bank notes authorized	1,000,000,000
Bank note under board authority	2,050,000,000
Bank notes outstanding			2,450,000,000
Line of credit	$ 787,000,000	800,000,000

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Short-Term Borrowings (Primary Components Of Short-term Borrowings) (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Short-term Debt [Line Items]
Weighted-average interest rate at year end	0.64%	1.10%
Conduit Commercial Paper Program [Member]
Short-term Debt [Line Items]
Balance		$ 1,919	$ 12,071	[1]
Maximum outstanding at any month end	271	7,275	15,645	[1]
Average outstanding during the year	113	6,339	10,691	[1]
Weighted-average interest rate at year end		0.57%	1.31%	[1]
Weighted-average interest rate during the year	0.47%	0.32%	1.26%	[1]
Securities Sold Under Repurchase Agreements [Member]
Short-term Debt [Line Items]
Balance	8,572	7,599	10,542
Maximum outstanding at any month end	9,853	9,058	12,993
Average outstanding during the year	9,040	8,108	11,065
Weighted-average interest rate at year end	0.04%	0.04%	0.03%
Weighted-average interest rate during the year	0.11%	0.05%	0.03%
Federal Funds Purchased [Member]
Short-term Debt [Line Items]
Balance	656	7,748	4,532
Maximum outstanding at any month end	8,259	7,748	7,166
Average outstanding during the year	845	1,759	956
Weighted-average interest rate at year end	0.05%	0.01%	0.01%
Weighted-average interest rate during the year	0.05%	0.05%	0.04%
Tax-Exempt Investment Program [Member]
Short-term Debt [Line Items]
Balance	2,294	2,484	2,736
Maximum outstanding at any month end	2,473	2,690	2,838
Average outstanding during the year	2,404	2,594	2,774
Weighted-average interest rate at year end	0.18%	0.37%	0.33%
Weighted-average interest rate during the year	0.26%	0.33%	0.47%
Corporate Commercial Paper Program [Member]
Short-term Debt [Line Items]
Balance	2,384	2,799	2,777
Maximum outstanding at any month end	2,825	2,831	2,851
Average outstanding during the year	$ 2,449	$ 2,791	$ 1,993
Weighted-average interest rate at year end	0.22%	0.31%	0.21%
Weighted-average interest rate during the year	0.23%	0.31%	0.30%
[1]	Amounts other than balance and weighted-average interest rate at year-end related to the period subsequent to the May 2009 conduit consolidation.

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Short-Term Borrowings (Securities Sold Under Repurchase Agreements) (Details) (USD $) In Millions, unless otherwise specified	Dec. 31, 2011	Dec. 31, 2010
Short-Term Borrowings [Abstract]
Collateralized by securities purchased under resale agreements	$ 5,651
Collateralized by investment securities	2,921
Total	$ 8,572	$ 7,599

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Short-Term Borrowings (U.S. Government Securities And Related Repurchase Agreements Including Accrued Interest) (Details) (USD $) In Millions, unless otherwise specified	Dec. 31, 2011
U.S. Government Securities Sold [Member]
Short-term Debt [Line Items]
Overnight maturity, Amortized Cost	$ 2,931
Overnight maturity, Fair Value	2,978
Repurchase Agreements [Member]
Short-term Debt [Line Items]
Overnight maturity, Amortized Cost	$ 2,921
Overnight maturity, Rate	0.00%

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Long-Term Debt (Narrative) (Details) (USD $)	12 Months Ended
Dec. 31, 2011	Dec. 31, 2010
Debt Instrument [Line Items]
Senior notes issued	$ 2,000,000,000
Non-cumulative perpetual preferred stock	500,000,000
Long-term debt	8,131,000,000		8,550,000,000
Capital lease included in long term debt	565,000,000		606,000,000
Office facility cost	272,000,000		279,000,000
One Lincoln Street Parking Garage [Member]
Debt Instrument [Line Items]
Capital lease included in long term debt	422,000,000		431,000,000
State Street Capital Trust III [Member]
Debt Instrument [Line Items]
Subordinated borrowing interest rate	6.00%
Debt Instrument maturity date	Dec 31, 2042
State Street Capital Trusts I And IV [Member]
Debt Instrument [Line Items]
Number of statutory business trusts	2
Issued trust preferred capital securities	955,000,000,000
Number of years interest payments received on debentures deferral	5
Series A Preferred Stock [Member]
Debt Instrument [Line Items]
Non-cumulative perpetual preferred stock	500,000,000
Preferred stock liquidation preference per share	$ 100,000
8.25% Fixed-To-Floating-Rate Subordinated Notes Due To State Street Capital Trust III In 2042 [Member]
Debt Instrument [Line Items]
Subordinated borrowing interest rate	8.25%
Junior Subordinated Debentures Due 2042 [Member]
Debt Instrument [Line Items]
Original junior subordinated debentures interest rate	6.00%
Floating-Rate Subordinated Notes Due To State Street Capital Trust IV In 2037 [Member]
Debt Instrument [Line Items]
Subordinated borrowing, due date	Jan 1, 2037
Long-term debt	800,000,000		800,000,000
4.956% Junior Subordinated Debenture Due 2018 [Member]
Debt Instrument [Line Items]
Subordinated borrowing interest rate	4.96%
Debt Instrument maturity date	Mar 15, 2018
Issued junior subordinated debentures	500,000,000
Non-cumulative perpetual preferred stock	500,000,000
2.15% Notes Due 2012 [Member]
Debt Instrument [Line Items]
Subordinated borrowing interest rate	2.15%
Subordinated borrowing, due date	Apr 30, 2012
Long-term debt	1,500,000,000	[1]	1,499,000,000	[1]
2.875% Notes Due 2016 [Member]
Debt Instrument [Line Items]
Subordinated borrowing interest rate	2.88%
Senior notes issued	1,000,000,000
Senior notes interest rate percentage	2.88%
Debt Instrument maturity date	Mar 7, 2016
Subordinated borrowing, due date	Jan 1, 2016
Long-term debt	999,000,000	[2]
4.30% Notes Due 2014 [Member]
Debt Instrument [Line Items]
Subordinated borrowing interest rate	4.30%
Subordinated borrowing, due date	May 30, 2014
Long-term debt	512,000,000		500,000,000
4.375% Notes Due 2021 [Member]
Debt Instrument [Line Items]
Subordinated borrowing interest rate	4.38%
Senior notes issued	750,000,000
Senior notes interest rate percentage	4.38%
Debt Instrument maturity date	Mar 7, 2021
Subordinated borrowing, due date	Jan 1, 2021
Long-term debt	757,000,000	[2]
5.375% Notes Due 2017 [Member]
Debt Instrument [Line Items]
Subordinated borrowing interest rate	5.38%
Subordinated borrowing, due date	Apr 30, 2017
Long-term debt	450,000,000		450,000,000
Floating-Rate Notes Due 2011 [Member]
Debt Instrument [Line Items]
Subordinated borrowing, due date	Jan 1, 2011
Long-term debt			1,450,000,000	[1]
Floating-Rate Notes Due 2014 [Member]
Debt Instrument [Line Items]
Senior notes issued	250,000,000
Debt Instrument maturity date	Mar 7, 2014
Subordinated borrowing, due date	Jan 1, 2014
Long-term debt	250,000,000
Floating-Rate Notes Due 2012 [Member]
Debt Instrument [Line Items]
Subordinated borrowing, due date	Apr 30, 2012
Long-term debt	250,000,000		268,000,000
Floating-rate notes, interest rate term	three-month LIBOR rate plus 10 basis points
1.85% Notes Due 2011 [Member]
Debt Instrument [Line Items]
Subordinated borrowing interest rate	1.85%
Subordinated borrowing, due date	Jan 1, 2011
Long-term debt			1,000,000,000	[1]
5.25% Subordinated Notes Due 2018 [Member]
Debt Instrument [Line Items]
Subordinated borrowing interest rate	5.25%
Subordinated borrowing, due date	Jan 1, 2018
Long-term debt	453,000,000	[2]	439,000,000	[2]
5.30% Subordinated Notes Due 2016 [Member]
Debt Instrument [Line Items]
Subordinated borrowing interest rate	5.30%
Subordinated borrowing, due date	Jan 1, 2016
Long-term debt	419,000,000		423,000,000
Floating Rate Subordinated Notes Due 2015 [Member]
Debt Instrument [Line Items]
Subordinated borrowing, due date	Jan 1, 2015
Long-term debt	200,000,000		200,000,000
Floating-Rate Subordinated Notes Due To State Street Capital Trust I In 2028 [Member]
Debt Instrument [Line Items]
Subordinated borrowing, due date	Jan 1, 2028
Long-term debt	$ 155,000,000		$ 155,000,000
[1]	Notes are guaranteed by the FDIC under its Temporary Liquidity Guarantee Program, or TLGP.
[2]	We have entered into interest-rate swap agreements, recorded as fair value hedges, to modify our interest expense on these subordinated notes from a fixed rate to a floating rate. As of December 31, 2011 and 2010, we recorded an increase of $140 million and $81 million, respectively, in the carrying value of long-term debt associated with fair value hedges. Refer to note 16 for additional information about derivatives.

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Long-Term Debt (Long-Term Debt) (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
Dec. 31, 2011	Dec. 31, 2010
Debt Instrument [Line Items]
Long-term debt	$ 8,131		$ 8,550
Long-term capital leases	694		716
Increase in carrying value of long-term debt	140		81
Floating-Rate Subordinated Notes Due To State Street Capital Trust IV In 2037 [Member]
Debt Instrument [Line Items]
Long-term debt	800		800
Subordinated borrowing, due date	Jan 1, 2037
Floating-Rate Subordinated Notes Due To State Street Capital Trust I In 2028 [Member]
Debt Instrument [Line Items]
Long-term debt	155		155
Subordinated borrowing, due date	Jan 1, 2028
Subordinated Notes Due To State Street Capital Trust III In 2042 [Member]
Debt Instrument [Line Items]
Long-term debt			500
Subordinated borrowing, due date	Jan 1, 2042
2.15% Notes Due 2012 [Member]
Debt Instrument [Line Items]
Long-term debt	1,500	[1]	1,499	[1]
Subordinated borrowing interest rate	2.15%
Subordinated borrowing, due date	Apr 30, 2012
2.875% Notes Due 2016 [Member]
Debt Instrument [Line Items]
Long-term debt	999	[2]
Subordinated borrowing interest rate	2.88%
Subordinated borrowing, due date	Jan 1, 2016
4.375% Notes Due 2021 [Member]
Debt Instrument [Line Items]
Long-term debt	757	[2]
Subordinated borrowing interest rate	4.38%
Subordinated borrowing, due date	Jan 1, 2021
4.956% Junior Subordinated Debentures Due 2018 [Member]
Debt Instrument [Line Items]
Long-term debt	542
Subordinated borrowing interest rate	4.96%
Subordinated borrowing, due date	Mar 15, 2018
4.30% Notes Due 2014 [Member]
Debt Instrument [Line Items]
Long-term debt	512		500
Subordinated borrowing interest rate	4.30%
Subordinated borrowing, due date	May 30, 2014
5.375% Notes Due 2017 [Member]
Debt Instrument [Line Items]
Long-term debt	450		450
Subordinated borrowing interest rate	5.38%
Subordinated borrowing, due date	Apr 30, 2017
Floating-Rate Notes Due 2012 [Member]
Debt Instrument [Line Items]
Long-term debt	250		268
Subordinated borrowing, due date	Apr 30, 2012
Floating-Rate Notes Due 2014 [Member]
Debt Instrument [Line Items]
Long-term debt	250
Subordinated borrowing, due date	Jan 1, 2014
7.35% Notes Due 2026 [Member]
Debt Instrument [Line Items]
Long-term debt	150		150
Subordinated borrowing interest rate	7.35%
Subordinated borrowing, due date	Jun 15, 2026
5.25% Subordinated Notes Due 2018 [Member]
Debt Instrument [Line Items]
Long-term debt	453	[2]	439	[2]
Subordinated borrowing interest rate	5.25%
Subordinated borrowing, due date	Jan 1, 2018
5.30% Subordinated Notes Due 2016 [Member]
Debt Instrument [Line Items]
Long-term debt	419		423
Subordinated borrowing interest rate	5.30%
Subordinated borrowing, due date	Jan 1, 2016
Floating Rate Subordinated Notes Due 2015 [Member]
Debt Instrument [Line Items]
Long-term debt	200		200
Subordinated borrowing, due date	Jan 1, 2015
Floating-Rate Notes Due 2011 [Member]
Debt Instrument [Line Items]
Long-term debt			1,450	[1]
Subordinated borrowing, due date	Jan 1, 2011
1.85% Notes Due 2011 [Member]
Debt Instrument [Line Items]
Long-term debt			1,000	[1]
Subordinated borrowing interest rate	1.85%
Subordinated borrowing, due date	Jan 1, 2011
Fair Value Hedges [Member]
Debt Instrument [Line Items]
Increase in carrying value of long-term debt	$ 140		$ 81
[1]	Notes are guaranteed by the FDIC under its Temporary Liquidity Guarantee Program, or TLGP.
[2]	We have entered into interest-rate swap agreements, recorded as fair value hedges, to modify our interest expense on these subordinated notes from a fixed rate to a floating rate. As of December 31, 2011 and 2010, we recorded an increase of $140 million and $81 million, respectively, in the carrying value of long-term debt associated with fair value hedges. Refer to note 16 for additional information about derivatives.

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Commitments And Contingencies (Narrative) (Details)	3 Months Ended	12 Months Ended	84 Months Ended
Sep. 30, 2011 USD ($)	Dec. 31, 2011 USD ($)	Dec. 31, 2010 USD ($)	Dec. 31, 2009 USD ($)	Dec. 31, 2008 USD ($)	Dec. 31, 2007 USD ($)	Dec. 31, 2011 EUR (€)	Sep. 30, 2010 USD ($)	Aug. 31, 2009 USD ($)	Sep. 15, 2008 USD ($) Cus	Dec. 31, 2011 Maximum [Member] USD ($)	Dec. 31, 2011 Minimum [Member] USD ($)
Unfunded commitments to extend credit, short term		77.00%
Percent of fair market value that must be maintained in collateral		100.00%
Compensation Received By Prudential		$ 28,100,000
Actual damages asserted by attorney general						56,000,000
Litigation reserve						250,000,000					90,000,000	0
Estimated indirect foreign exchange revenue		331,000,000	336,000,000	369,000,000	462,000,000
Settlement, amount	400,000,000		12,000,000
Net assets of a fund held by Lehman										312,000,000
Number of customer not entered into settlement agreements										4
Settlements with Dutch customers							42,000,000
Investment in funds by customers not settled										143,000,000
Notional amount of contingencies accounted for as derivative financial instruments		40,960,000,000	46,760,000,000
Asserted damages by two participants in the agency securities lending program									120,000,000
Complaints seek relief including claimed damages		100,000,000
The difference between the amortized cost and market value of the in-kind distribution		28,500,000						49,000,000
Cash collateral provided for securities lending		5,210,000,000	2,720,000,000
Cash collateral received for securities lending		$ 4,590,000,000	$ 1,210,000,000

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Commitments And Contingencies (Contractual Amounts Of Credit-Related Off-Balance Sheet Financial Instruments) (Details) (USD $) In Millions, unless otherwise specified	Dec. 31, 2011	Dec. 31, 2010
Commitments And Contingencies [Abstract]
Indemnified securities financing	$ 302,342	[1]	$ 334,235	[1]
Unfunded commitments to extend credit	17,297		14,772
Asset purchase agreements	5,056		4,866
Standby letters of credit	$ 3,938		$ 4,174
[1]	Related collateral and other information is provided in the following "Securities Finance" section.

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Commitments And Contingencies (Schedule Of Repurchase Agreements) (Details) (USD $) In Millions, unless otherwise specified	Dec. 31, 2011	Dec. 31, 2010
Commitments And Contingencies [Abstract]
Aggregate fair value of indemnified securities financing	$ 302,342	[1]	$ 334,235	[1]
Aggregate fair value of cash and securities held as collateral for indemnified securities financing	312,598		343,410
Aggregate fair value of collateral for indemnified securities financing invested in indemnified repurchase agreements	88,656	[1]	89,069	[1]
Aggregate fair value of cash and securities held as collateral for indemnified repurchase agreements	$ 93,039		$ 93,294
[1]	Related collateral and other information is provided in the following "Securities Finance" section.

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Variable Interest Entities (Details) (USD $)	12 Months Ended
Dec. 31, 2011 years	Dec. 31, 2010 years	Dec. 31, 2009
Variable Interest Entities [Abstract]
Investment securities related to state and political subdivisions	$ 2,810,000,000	$ 2,850,000,000
Variable interest entity, other short-term borrowings	2,290,000,000	2,480,000,000
Weighted-average life of trusts, years	7.4	7.7
Total standby bond-purchase agreement committed to trusts	2,350,000,000
Letters of credit	669,000,000
Number of standby purchase agreements utilized	0
Asset-backed securities, fair value	264,000,000	5,010,000,000
Receivable loans purchased	935,000,000	2,200,000,000
Commercial paper	2,380,000,000	2,800,000,000
Aggregate notional value of CDOs	400,000,000	1,000,000,000
Carrying value of the underlying collateral	166,000,000	323,000,000
Pre-tax extraordinary loss			6,100,000,000
After-tax extraordinary loss			(3,684,000,000)
Accretion in interest revenue	$ 220,000,000	$ 712,000,000	$ 621,000,000

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Shareholders' Equity (Narrative) (Details) (USD $) In Millions, except Share data, unless otherwise specified	9 Months Ended	12 Months Ended
Dec. 31, 2011	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009	Dec. 31, 2008
Shareholders' Equity [Line Items]
Non-cumulative perpetual preferred stock, shares	5,001	5,001	5,001
Non-cumulative perpetual preferred stock	$ 500	$ 500
Series A, liquidation preference per share	$ 100,000	$ 100,000
Common stock, approximate aggregate cost	675
Common stock purchased and held in trust, shares		406,000	420,000
Common stock purchase program, authorized amount		675
Common shares available for purchase			13,250,000
Common stock acquired,shares	16,300,000
Average historical cost per share	$ 41.38
Realized (losses) gains from sales of investment securities		140	(55)	368
Unrealized pre-tax gains (losses) included in other comprehensive income		76		(728)	46
Deferred taxes related to unrealized pre-tax gains			$ 30	$ 291	$ 18
Preferred stock dividend payment terms		three-month LIBOR plus 4.99%
Debt instrument, variable interest rate	4.99%	4.99%
State Street Capital Trust III [Member]
Shareholders' Equity [Line Items]
Subordinated borrowing, interest rate		6.00%
Junior subordinated debentures, due date		2042

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Shareholders' Equity (Schedule Of Accumulated Other Comprehensive (Loss) Income) (Details) (USD $) In Millions, unless otherwise specified	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Shareholders' Equity [Abstract]
Foreign currency translation		$ 216	$ 281
Net unrealized loss on hedges of net investments in non-U.S. subsidiaries	(14)	(14)	(14)
Net unrealized gain (loss) on available-for-sale securities portfolio	110	(90)	(1,001)
Net unrealized loss related to reclassified available-for-sale securities	(189)	(317)	(635)
Net unrealized gain (loss) on available-for-sale securities	(79)	(407)	(1,636)
Net unrealized loss on available-for-sale securities designated in fair value hedges	(210)	(135)	(113)
Expected losses from other-than-temporary impairment on available-for-sale securities related to factors other than credit	(17)	(17)	(159)
Expected losses from other-than-temporary impairment on held-to-maturity securities related to factors other than credit	(86)	(111)	(387)
Net unrealized loss on cash flow hedges	(5)	(11)	(18)
Minimum pension liability	(248)	(210)	(192)
Total	$ (659)	$ (689)	$ (2,238)

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Fair Value (Schedule Of Fair Value Measurements On A Recurring Basis) (Details) (USD $) In Millions, unless otherwise specified	Dec. 31, 2011	Dec. 31, 2010
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Trading account assets	$ 707		$ 479
Quoted Market Prices In Active Markets (Level 1) [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Direct obligations	1,727		6,529
Non-U.S. equity securities	1		7
Total investment securities available for sale	1,728		6,536
Other assets	110		168
Total assets carried at fair value	2,407		7,061
Other liabilities	110		168
Total liabilities carried at fair value	110		724
Pricing Methods With Significant Observable Market Inputs (Level 2) [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Direct obligations	1,109		1,048
Mortgage-backed securities	28,832		22,967
Student loans	15,685		13,181
Credit cards	10,396		7,560
Sub-prime	1,404		1,818
Other	667		569
Total asset-backed securities	28,152		23,128
Non-U.S. debt securities	16,378		10,872
State and political subdivisions	6,997		6,554
Collateralized mortgage obligations	3,753		1,502
Other U.S. debt securities	3,613		2,533
U.S. equity securities	640		1,115
Non-U.S. equity securities	117		119
Total investment securities available for sale	89,591		69,838
Total assets carried at fair value	103,570		77,931
Other liabilities			3
Total liabilities carried at fair value	14,162		8,557
Pricing Methods With Significant Unobservable Market Inputs (Level 3) [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Mortgage-backed securities	1,189		673
Student loans	860		1,234
Credit cards	91		43
Other	2,798		2,000
Total asset-backed securities	3,749		3,277
Non-U.S. debt securities	3,296		1,145
State and political subdivisions	50		50
Collateralized mortgage obligations	227		359
Other U.S. debt securities	2		3
Total investment securities available for sale	8,513		5,507
Total assets carried at fair value	8,691		5,761
Other liabilities	20
Total liabilities carried at fair value	201		269
Impact Of Netting [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total assets carried at fair value	(7,653)	[1]	(2,970)	[1]
Total liabilities carried at fair value	(7,653)	[1]	(2,970)	[1]
Total Net Carrying Value In Consolidated Statement Of Condition [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Direct obligations	2,836		7,577
Mortgage-backed securities	30,021		23,640
Student loans	16,545		14,415
Credit cards	10,487		7,603
Sub-prime	1,404		1,818
Other	3,465		2,569
Total asset-backed securities	31,901		26,405
Non-U.S. debt securities	19,674		12,017
State and political subdivisions	7,047		6,604
Collateralized mortgage obligations	3,980		1,861
Other U.S. debt securities	3,615		2,536
U.S. equity securities	640		1,115
Non-U.S. equity securities	118		126
Total investment securities available for sale	99,832		81,881
Other assets	110		168
Total assets carried at fair value	107,015		87,783
Other liabilities	130		171
Total liabilities carried at fair value	6,820		6,580
Parent Company [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Trading account assets	138		122
U.S. Government Securities [Member] | Quoted Market Prices In Active Markets (Level 1) [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Trading account assets	20		20
Accrued expenses and other liabilities			210
U.S. Government Securities [Member] | Total Net Carrying Value In Consolidated Statement Of Condition [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Trading account assets	20		20
Accrued expenses and other liabilities			210
Non-U.S. Government Securities [Member] | Quoted Market Prices In Active Markets (Level 1) [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Trading account assets	498		297
Accrued expenses and other liabilities			345
Non-U.S. Government Securities [Member] | Total Net Carrying Value In Consolidated Statement Of Condition [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Trading account assets	498		297
Accrued expenses and other liabilities			345
Asset-Backed Securities [Member] | Pricing Methods With Significant Observable Market Inputs (Level 2) [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Non-U.S. debt securities	2,535		1,046
Asset-Backed Securities [Member] | Pricing Methods With Significant Unobservable Market Inputs (Level 3) [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Non-U.S. debt securities	1,768		740
Asset-Backed Securities [Member] | Total Net Carrying Value In Consolidated Statement Of Condition [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Non-U.S. debt securities	4,303		1,786
Mortgage-Backed Securities [Member] | Pricing Methods With Significant Observable Market Inputs (Level 2) [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Non-U.S. debt securities	9,418		5,898
Mortgage-Backed Securities [Member] | Pricing Methods With Significant Unobservable Market Inputs (Level 3) [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Non-U.S. debt securities	1,457		396
Mortgage-Backed Securities [Member] | Total Net Carrying Value In Consolidated Statement Of Condition [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Non-U.S. debt securities	10,875		6,294
Government Securities [Member] | Pricing Methods With Significant Observable Market Inputs (Level 2) [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Non-U.S. debt securities	1,671		2,004
Government Securities [Member] | Pricing Methods With Significant Unobservable Market Inputs (Level 3) [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Non-U.S. debt securities			1
Government Securities [Member] | Total Net Carrying Value In Consolidated Statement Of Condition [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Non-U.S. debt securities	1,671		2,005
Other Trading Account Assets [Member] | Quoted Market Prices In Active Markets (Level 1) [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Trading account assets	51		40
Other Trading Account Assets [Member] | Pricing Methods With Significant Observable Market Inputs (Level 2) [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Trading account assets	138		122
Other Trading Account Assets [Member] | Total Net Carrying Value In Consolidated Statement Of Condition [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Trading account assets	189		162
Foreign Exchange Contracts [Member] | Pricing Methods With Significant Observable Market Inputs (Level 2) [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative instruments, assets	12,045		7,804
Derivative instruments liabilities	12,191		8,195
Foreign Exchange Contracts [Member] | Pricing Methods With Significant Unobservable Market Inputs (Level 3) [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative instruments, assets	168		254
Derivative instruments liabilities	161		260
Interest-Rate Contracts [Member] | Quoted Market Prices In Active Markets (Level 1) [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative instruments liabilities			1
Interest-Rate Contracts [Member] | Pricing Methods With Significant Observable Market Inputs (Level 2) [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative instruments, assets	1,795		165
Derivative instruments liabilities	1,970		358
Interest-Rate Contracts [Member] | Pricing Methods With Significant Unobservable Market Inputs (Level 3) [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative instruments, assets	10
Derivative instruments liabilities	11
Other [Member] | Pricing Methods With Significant Observable Market Inputs (Level 2) [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Non-U.S. debt securities	2,754		1,924
Derivative instruments, assets	1		2
Derivative instruments liabilities	1		1
Other [Member] | Pricing Methods With Significant Unobservable Market Inputs (Level 3) [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Non-U.S. debt securities	71		8
Derivative instruments liabilities	9		9
Other [Member] | Total Net Carrying Value In Consolidated Statement Of Condition [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Non-U.S. debt securities	2,825		1,932
Derivative Instruments [Member] | Quoted Market Prices In Active Markets (Level 1) [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative instruments liabilities			1
Derivative Instruments [Member] | Pricing Methods With Significant Observable Market Inputs (Level 2) [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative instruments, assets	13,841		7,971
Derivative instruments liabilities	14,162		8,554
Derivative Instruments [Member] | Pricing Methods With Significant Unobservable Market Inputs (Level 3) [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative instruments, assets	178		254
Derivative instruments liabilities	181		269
Derivative Instruments [Member] | Impact Of Netting [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative instruments, assets	(7,653)	[1]	(2,970)	[1]
Derivative instruments liabilities	(7,653)	[1]	(2,970)	[1]
Derivative Instruments [Member] | Total Net Carrying Value In Consolidated Statement Of Condition [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative instruments, assets	6,366		5,255
Derivative instruments liabilities	$ 6,690		$ 5,854
[1]	Represents counterparty netting against level 2 financial assets and liabilities, where a legally enforceable master netting agreement exists between State Street and the counterparty. This netting cannot be disaggregated by type of derivative instrument.

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Fair Value (Schedule Of Fair Value Measurements Using Significant Unobservable Inputs) (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
Dec. 31, 2011	Dec. 31, 2010
Other Liabilities [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Fair Value, beginning balance, Liabilities
Transfers in to Level 3, Liabilities
Transfers out of Level 3, Liabilities
Included in Revenue, Liabilities
Included in Other Comprehensive Income, Liabilities
Purchases, Liabilities
Issuances, Liabilities	20
Sales, Liabilities
Settlements, Liabilities
Fair Value, ending balance, Liabilities	20
Change in Unrealized Gains (Losses) Related to Financial Instruments
Assets Carried At Fair Value [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Fair Value, beginning balance, Assets	5,761	7,556
Transfers in to Level 3, Assets	115
Transfers out of Level 3, Assets	(4,590)
Included in Revenue, Assets	437	86
Included in Other Comprehensive Income, Assets	(22)	271
Purchases, Assets	8,212
Issuances, Assets
Sales, Assets	(59)
Settlements, Assets	(1,163)
Purchases, Issuances and Settlements, Net, Assets		1,633
Transfers Into and/or Out of Level 3, Assets		(3,785)
Fair Value, ending balance, Assets	8,691	5,761
Change in Unrealized Gains (Losses) Related to Financial Instruments	(59)	(41)
Liabilities Carried At Fair Value [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Fair Value, beginning balance, Liabilities	269	147
Transfers in to Level 3, Liabilities
Transfers out of Level 3, Liabilities
Included in Revenue, Liabilities	(111)
Included in Other Comprehensive Income, Liabilities
Purchases, Liabilities	(7)
Issuances, Liabilities	253	(72)
Sales, Liabilities	(7)
Settlements, Liabilities	(196)
Purchases, Issuances and Settlements, Net, Liabilities		194
Transfers Into and/or Out of Level 3, Liabilities
Fair Value, ending balance, Liabilities	201	269
Change in Unrealized Gains (Losses) Related to Financial Instruments	(50)	(36)
Other [Member] | Accrued Expenses And Other Liabilities [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Fair Value, beginning balance, Liabilities	9	9
Transfers in to Level 3, Liabilities
Transfers out of Level 3, Liabilities
Included in Revenue, Liabilities
Included in Other Comprehensive Income, Liabilities
Purchases, Liabilities
Issuances, Liabilities
Sales, Liabilities
Settlements, Liabilities
Purchases, Issuances and Settlements, Net, Liabilities
Transfers Into and/or Out of Level 3, Liabilities
Fair Value, ending balance, Liabilities	9	9
Change in Unrealized Gains (Losses) Related to Financial Instruments
State And Political Subdivisions [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Fair Value, beginning balance, Assets	50	2
Transfers in to Level 3, Assets	1
Transfers out of Level 3, Assets	(3)
Included in Revenue, Assets
Included in Other Comprehensive Income, Assets
Purchases, Assets	2
Issuances, Assets
Sales, Assets
Settlements, Assets
Purchases, Issuances and Settlements, Net, Assets		(1)
Transfers Into and/or Out of Level 3, Assets		49
Fair Value, ending balance, Assets	50	50
Change in Unrealized Gains (Losses) Related to Financial Instruments
Collateralized Mortgage Obligations [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Fair Value, beginning balance, Assets	359	199
Transfers in to Level 3, Assets
Transfers out of Level 3, Assets	(519)
Included in Revenue, Assets	522	(35)
Included in Other Comprehensive Income, Assets	(4)	6
Purchases, Assets	428
Issuances, Assets
Sales, Assets
Settlements, Assets	(559)
Purchases, Issuances and Settlements, Net, Assets		362
Transfers Into and/or Out of Level 3, Assets		(173)
Fair Value, ending balance, Assets	227	359
Change in Unrealized Gains (Losses) Related to Financial Instruments
Other U.S. Debt Securities [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Fair Value, beginning balance, Assets	3	3
Transfers in to Level 3, Assets
Transfers out of Level 3, Assets
Included in Revenue, Assets
Included in Other Comprehensive Income, Assets
Purchases, Assets
Issuances, Assets
Sales, Assets
Settlements, Assets	(1)
Purchases, Issuances and Settlements, Net, Assets
Transfers Into and/or Out of Level 3, Assets
Fair Value, ending balance, Assets	2	3
Change in Unrealized Gains (Losses) Related to Financial Instruments
Investment Securities Available For Sale [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Fair Value, beginning balance, Assets	5,507	7,428
Transfers in to Level 3, Assets	115
Transfers out of Level 3, Assets	(4,590)
Included in Revenue, Assets	561	141
Included in Other Comprehensive Income, Assets	(22)	271
Purchases, Assets	7,969
Issuances, Assets
Sales, Assets	(52)
Settlements, Assets	(975)
Purchases, Issuances and Settlements, Net, Assets		1,452
Transfers Into and/or Out of Level 3, Assets		(3,785)
Fair Value, ending balance, Assets	8,513	5,507
Change in Unrealized Gains (Losses) Related to Financial Instruments
Foreign Exchange Contracts [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Fair Value, beginning balance, Assets	254	128
Transfers in to Level 3, Assets
Transfers out of Level 3, Assets
Included in Revenue, Assets	(134)	(55)
Included in Other Comprehensive Income, Assets
Purchases, Assets	236
Issuances, Assets
Sales, Assets
Settlements, Assets	(188)
Purchases, Issuances and Settlements, Net, Assets		181
Transfers Into and/or Out of Level 3, Assets
Fair Value, ending balance, Assets	168	254
Change in Unrealized Gains (Losses) Related to Financial Instruments	(68)	(41)
Foreign Exchange Contracts [Member] | Accrued Expenses And Other Liabilities [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Fair Value, beginning balance, Liabilities	260	138
Transfers in to Level 3, Liabilities
Transfers out of Level 3, Liabilities
Included in Revenue, Liabilities	(122)
Included in Other Comprehensive Income, Liabilities
Purchases, Liabilities
Issuances, Liabilities	219	(72)
Sales, Liabilities
Settlements, Liabilities	(196)
Purchases, Issuances and Settlements, Net, Liabilities		194
Transfers Into and/or Out of Level 3, Liabilities
Fair Value, ending balance, Liabilities	161	260
Change in Unrealized Gains (Losses) Related to Financial Instruments	(60)	(36)
Interest-Rate Contracts [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Fair Value, beginning balance, Assets
Transfers in to Level 3, Assets
Transfers out of Level 3, Assets
Included in Revenue, Assets	10
Included in Other Comprehensive Income, Assets
Purchases, Assets	7
Issuances, Assets
Sales, Assets	(7)
Settlements, Assets
Fair Value, ending balance, Assets	10
Change in Unrealized Gains (Losses) Related to Financial Instruments	9
Interest-Rate Contracts [Member] | Accrued Expenses And Other Liabilities [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Fair Value, beginning balance, Liabilities
Transfers in to Level 3, Liabilities
Transfers out of Level 3, Liabilities
Included in Revenue, Liabilities	11
Included in Other Comprehensive Income, Liabilities
Purchases, Liabilities	(7)
Issuances, Liabilities	14
Sales, Liabilities	(7)
Settlements, Liabilities
Fair Value, ending balance, Liabilities	11
Change in Unrealized Gains (Losses) Related to Financial Instruments	10
Derivative Instruments [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Fair Value, beginning balance, Assets	254
Transfers in to Level 3, Assets
Transfers out of Level 3, Assets
Included in Revenue, Assets	(124)
Included in Other Comprehensive Income, Assets
Purchases, Assets	243
Issuances, Assets
Sales, Assets	(7)
Settlements, Assets	(188)
Fair Value, ending balance, Assets	178
Change in Unrealized Gains (Losses) Related to Financial Instruments	(59)
Derivative Instruments [Member] | Accrued Expenses And Other Liabilities [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Fair Value, beginning balance, Liabilities	269	147
Transfers in to Level 3, Liabilities
Transfers out of Level 3, Liabilities
Included in Revenue, Liabilities	(111)
Included in Other Comprehensive Income, Liabilities
Purchases, Liabilities	(7)
Issuances, Liabilities	233	(72)
Sales, Liabilities	(7)
Settlements, Liabilities	(196)
Purchases, Issuances and Settlements, Net, Liabilities		194
Transfers Into and/or Out of Level 3, Liabilities
Fair Value, ending balance, Liabilities	181	269
Change in Unrealized Gains (Losses) Related to Financial Instruments	(50)	(36)
U.S. Treasury And Federal Agencies [Member] | Direct Obligations [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Fair Value, beginning balance, Assets
Transfers in to Level 3, Assets
Transfers out of Level 3, Assets	(40)
Included in Revenue, Assets
Included in Other Comprehensive Income, Assets
Purchases, Assets	40
Issuances, Assets
Sales, Assets
Settlements, Assets
Fair Value, ending balance, Assets
Change in Unrealized Gains (Losses) Related to Financial Instruments
U.S. Treasury And Federal Agencies [Member] | Mortgage-Backed Securities [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Fair Value, beginning balance, Assets	673	58
Transfers in to Level 3, Assets
Transfers out of Level 3, Assets	(936)
Included in Revenue, Assets		(1)
Included in Other Comprehensive Income, Assets	1	(1)
Purchases, Assets	1,540
Issuances, Assets
Sales, Assets
Settlements, Assets	(89)
Purchases, Issuances and Settlements, Net, Assets		659
Transfers Into and/or Out of Level 3, Assets		(42)
Fair Value, ending balance, Assets	1,189	673
Change in Unrealized Gains (Losses) Related to Financial Instruments
Asset-Backed Securities [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Fair Value, beginning balance, Assets	3,277	5,997
Transfers in to Level 3, Assets	114
Transfers out of Level 3, Assets	(1,315)
Included in Revenue, Assets	38	119
Included in Other Comprehensive Income, Assets	(17)	225
Purchases, Assets	1,795
Issuances, Assets
Sales, Assets	(49)
Settlements, Assets	(94)
Purchases, Issuances and Settlements, Net, Assets		(792)
Transfers Into and/or Out of Level 3, Assets		(2,272)
Fair Value, ending balance, Assets	3,749	3,277
Change in Unrealized Gains (Losses) Related to Financial Instruments
Asset-Backed Securities [Member] | Student Loans [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Fair Value, beginning balance, Assets	1,234	3,175
Transfers in to Level 3, Assets
Transfers out of Level 3, Assets	(785)
Included in Revenue, Assets	3	9
Included in Other Comprehensive Income, Assets	(21)	81
Purchases, Assets	421
Issuances, Assets
Sales, Assets
Settlements, Assets	8
Purchases, Issuances and Settlements, Net, Assets		(317)
Transfers Into and/or Out of Level 3, Assets		(1,714)
Fair Value, ending balance, Assets	860	1,234
Change in Unrealized Gains (Losses) Related to Financial Instruments
Asset-Backed Securities [Member] | Credit Cards [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Fair Value, beginning balance, Assets	43	312
Transfers in to Level 3, Assets
Transfers out of Level 3, Assets	(285)
Included in Revenue, Assets	4	17
Included in Other Comprehensive Income, Assets	(2)	(16)
Purchases, Assets	301
Issuances, Assets
Sales, Assets
Settlements, Assets	30
Purchases, Issuances and Settlements, Net, Assets		(31)
Transfers Into and/or Out of Level 3, Assets		(239)
Fair Value, ending balance, Assets	91	43
Change in Unrealized Gains (Losses) Related to Financial Instruments
Asset-Backed Securities [Member] | Sub-Prime [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Fair Value, beginning balance, Assets		3
Transfers in to Level 3, Assets
Transfers out of Level 3, Assets
Included in Revenue, Assets		1
Included in Other Comprehensive Income, Assets
Purchases, Assets
Issuances, Assets
Sales, Assets
Settlements, Assets
Purchases, Issuances and Settlements, Net, Assets
Transfers Into and/or Out of Level 3, Assets		(4)
Fair Value, ending balance, Assets
Change in Unrealized Gains (Losses) Related to Financial Instruments
Asset-Backed Securities [Member] | Other Asset-Backed Securities [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Fair Value, beginning balance, Assets	2,000	2,507
Transfers in to Level 3, Assets	114
Transfers out of Level 3, Assets	(245)
Included in Revenue, Assets	31	92
Included in Other Comprehensive Income, Assets	6	160
Purchases, Assets	1,073
Issuances, Assets
Sales, Assets	(49)
Settlements, Assets	(132)
Purchases, Issuances and Settlements, Net, Assets		(444)
Transfers Into and/or Out of Level 3, Assets		(315)
Fair Value, ending balance, Assets	2,798	2,000
Change in Unrealized Gains (Losses) Related to Financial Instruments
Non-U.S. Debt Securities [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Fair Value, beginning balance, Assets	1,145	1,169
Transfers in to Level 3, Assets
Transfers out of Level 3, Assets	(1,777)
Included in Revenue, Assets	1	58
Included in Other Comprehensive Income, Assets	(2)	41
Purchases, Assets	4,164
Issuances, Assets
Sales, Assets	(3)
Settlements, Assets	(232)
Purchases, Issuances and Settlements, Net, Assets		1,224
Transfers Into and/or Out of Level 3, Assets		(1,347)
Fair Value, ending balance, Assets	3,296	1,145
Change in Unrealized Gains (Losses) Related to Financial Instruments
Non-U.S. Debt Securities [Member] | Mortgage-Backed Securities [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Fair Value, beginning balance, Assets	396	768
Transfers in to Level 3, Assets
Transfers out of Level 3, Assets	(838)
Included in Revenue, Assets		35
Included in Other Comprehensive Income, Assets	(9)	7
Purchases, Assets	1,920
Issuances, Assets
Sales, Assets
Settlements, Assets	(12)
Purchases, Issuances and Settlements, Net, Assets		576
Transfers Into and/or Out of Level 3, Assets		(990)
Fair Value, ending balance, Assets	1,457	396
Change in Unrealized Gains (Losses) Related to Financial Instruments
Non-U.S. Debt Securities [Member] | Asset-Backed Securities [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Fair Value, beginning balance, Assets	740	361
Transfers in to Level 3, Assets
Transfers out of Level 3, Assets	(939)
Included in Revenue, Assets	1	24
Included in Other Comprehensive Income, Assets	7	31
Purchases, Assets	2,179
Issuances, Assets
Sales, Assets	(3)
Settlements, Assets	(217)
Purchases, Issuances and Settlements, Net, Assets		686
Transfers Into and/or Out of Level 3, Assets		(362)
Fair Value, ending balance, Assets	1,768	740
Change in Unrealized Gains (Losses) Related to Financial Instruments
Non-U.S. Debt Securities [Member] | Government Securities [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Fair Value, beginning balance, Assets	1
Transfers in to Level 3, Assets
Transfers out of Level 3, Assets
Included in Revenue, Assets
Included in Other Comprehensive Income, Assets
Purchases, Assets
Issuances, Assets
Sales, Assets
Settlements, Assets	(1)
Purchases, Issuances and Settlements, Net, Assets		1
Transfers Into and/or Out of Level 3, Assets
Fair Value, ending balance, Assets		1
Change in Unrealized Gains (Losses) Related to Financial Instruments
Non-U.S. Debt Securities [Member] | Other [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Fair Value, beginning balance, Assets	8	40
Transfers in to Level 3, Assets
Transfers out of Level 3, Assets
Included in Revenue, Assets		(1)
Included in Other Comprehensive Income, Assets		3
Purchases, Assets	65
Issuances, Assets
Sales, Assets
Settlements, Assets	(2)
Purchases, Issuances and Settlements, Net, Assets		(39)
Transfers Into and/or Out of Level 3, Assets		5
Fair Value, ending balance, Assets	71	8
Change in Unrealized Gains (Losses) Related to Financial Instruments

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Fair Value (Level 3 Total Realized And Unrealized Gains And Losses Recorded In Revenue) (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Trading Services [Member]
Realized and Unrealized Gains and Losses [Line Items]
Total Realized and Unrealized Gains (Losses) Recorded in Revenue	$ (13)	$ 17	$ 38
Change in Unrealized Gains (Losses) Related to Financial Instruments Held	(9)	(5)	(5)
Total Fee Revenue [Member]
Realized and Unrealized Gains and Losses [Line Items]
Total Realized and Unrealized Gains (Losses) Recorded in Revenue	(13)	17	88
Change in Unrealized Gains (Losses) Related to Financial Instruments Held	(9)	(5)	45
Processing Fees And Other Revenue [Member]
Realized and Unrealized Gains and Losses [Line Items]
Total Realized and Unrealized Gains (Losses) Recorded in Revenue			50
Change in Unrealized Gains (Losses) Related to Financial Instruments Held			50
Net Interest Revenue [Member]
Realized and Unrealized Gains and Losses [Line Items]
Total Realized and Unrealized Gains (Losses) Recorded in Revenue	561	141	(101)
Total Revenue [Member]
Realized and Unrealized Gains and Losses [Line Items]
Total Realized and Unrealized Gains (Losses) Recorded in Revenue	548	158	(13)
Change in Unrealized Gains (Losses) Related to Financial Instruments Held	$ (9)	$ (5)	$ 45

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Fair Value (Reported Amounts And Estimated Fair Values For Financial Instruments) (Details) (USD $) In Millions, unless otherwise specified	Dec. 31, 2011	Dec. 31, 2010
Fair Value [Abstract]
Investment securities held to maturity, Reported Amount	$ 9,321	$ 12,249
Investment securities held to maturity, Fair Value	9,362	12,576
Net loans (excluding leases), Reported Amount	8,777	10,387
Net loans (excluding leases), Fair Value	8,752	10,242
Long-term debt, Reported Amount	8,131	8,550
Long-term debt, Fair Value	$ 8,206	$ 8,498

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Equity-Based Compensation (Narrative) (Details) (USD $) In Millions, except Per Share data, unless otherwise specified	12 Months Ended
Dec. 31, 2011 months	Dec. 31, 2010	Dec. 31, 2009	May 01, 2009
Original number of shares approved for issuance and stock-based awards				20
Shares of common stock approved for issuance for stock and stock-based awards				37
Shares awarded under the 2006 Plan	32.84	26.39	17.59
Shares available to issue due to cancellations and forfeitures	8
Compensation expense related to stock options, stock appreciation rights, restricted stock awards, deferred stock awards and performance awards	$ 261	$ 229	$ 126
Expense associated with expense acceleration in connection with the restructuring plan	25	12
Aggregate income tax benefit related to compensation expense	103	95	50
Weighted-average grant date fair value of options granted			$ 2.96
Total intrinsic value of options exercised	6	2	5
Unrecognized compensation cost, net of estimated forfeitures, period, months	7
Restricted Stock [Member]
Unrecognized compensation cost, net of estimated forfeitures	101
Unrecognized compensation cost, net of estimated forfeitures, period, years	2.1
Total fair value of awards vested	66	23	20
Weighted-average grant date fair value		$ 44.49	$ 34.58
Deferred Stock Awards [Member]
Unrecognized compensation cost, net of estimated forfeitures	214
Unrecognized compensation cost, net of estimated forfeitures, period, years	2.6
Total fair value of awards vested	107	107	193
Weighted-average grant date fair value	$ 41.92	$ 42.45	$ 25.51
Performance Awards [Member]
Unrecognized compensation cost, net of estimated forfeitures	29
Unrecognized compensation cost, net of estimated forfeitures, period, years	1.7
Total fair value of awards vested	10	12	23
Weighted-average grant date fair value	$ 42.28	$ 43.33	$ 19.46
Maximum [Member]
Unrecognized compensation cost, net of estimated forfeitures	$ 1
Maximum [Member] | Stock Options and Stock Appreciation Rights Granted Under the 1997 and 2006 Plans [Member]
Share-based compensation arrangement by share-based payment award, award vesting period, years		ten
Maximum [Member] | Restricted Stock [Member]
Share-based compensation arrangement by share-based payment award, award vesting period, years		four
Maximum [Member] | Deferred Stock Awards [Member]
Share-based compensation arrangement by share-based payment award, award vesting period, years		four
Maximum [Member] | Performance Awards [Member]
Share-based compensation arrangement by share-based payment award, award vesting period, years		four
Minimum [Member] | Stock Options and Stock Appreciation Rights Granted Under the 1997 and 2006 Plans [Member]
Share-based compensation arrangement by share-based payment award, award vesting period, years		four
Minimum [Member] | Restricted Stock [Member]
Share-based compensation arrangement by share-based payment award, award vesting period, years		three
Minimum [Member] | Deferred Stock Awards [Member]
Share-based compensation arrangement by share-based payment award, award vesting period, years		two
Minimum [Member] | Performance Awards [Member]
Share-based compensation arrangement by share-based payment award, award vesting period, years		one

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Equity-Based Compensation (Weighted-Average Assumptions Used In Connection With The Option-Pricing Model) (Details)	12 Months Ended
Dec. 31, 2009
Equity-Based Compensation [Abstract]
Dividend yield	4.82%
Expected volatility	26.70%
Risk-free interest rate	2.49%
Expected option lives (in years)	7.8

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Equity-Based Compensation (Stock Options And Stock Appreciation Rights Activity) (Details) (USD $) In Millions, except Share data in Thousands, unless otherwise specified	12 Months Ended
Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Equity-Based Compensation [Abstract]
Outstanding at beginning, shares	7,709	10,983	13,167
Outstanding at beginning, weighted average remaining contractual term, years	3.2
Exercised, shares	(1,028)	(297)
Exercised, weighted average exercise price	$ 40.52	$ 37.53
Forfeited or expired, shares	(2,246)	(1,887)
Forfeited or expired, weighted average exercise price	$ 50.06	$ 54.76
Outstanding at end, shares	7,709	10,983	13,167
Outstanding at end, weighted average exercise price	$ 53.37	$ 51.49	$ 51.64
Outstanding at end, weighted average remaining contractual term, years	3.2
Outstanding at end, aggregate intrinsic value	$ 10
Exercisable, shares	7,221
Exercisable, weighted average exercise price	$ 53.69
Exercisable, weighted average remaining contractual term, years	2.9
Exercisable, aggregate intrinsic value	$ 4

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Equity-Based Compensation (Restricted Stock Awards Activity) (Details) (Restricted Stock [Member], USD $) In Thousands, except Per Share data, unless otherwise specified	12 Months Ended
Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Restricted Stock [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Outstanding at beginning, shares	5,801	1,247
Outstanding at beginning, weighted-average grant date fair value	$ 43.21	$ 41.87
Granted, shares		5,264
Granted, weighted-average grant date fair value		$ 44.49	$ 34.58
Vested, shares	(1,509)	(489)
Vested, weighted-average grant date fair value	$ 42.96	$ 52.87
Forfeited, shares	(127)	(221)
Forfeited, weighted-average grant date fair value	$ 44.59	$ 44.95
Outstanding at end, shares	4,165	5,801	1,247
Outstanding at end, weighted-average grant date fair value	$ 43.25	$ 43.21	$ 41.87

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Equity-Based Compensation (Deferred Stock Awards Activity) (Details) (Deferred Stock Awards [Member], USD $) In Thousands, except Per Share data, unless otherwise specified	12 Months Ended
Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Deferred Stock Awards [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Outstanding at beginning, shares	6,191	6,573
Outstanding at beginning, weighted-average grant date fair value	$ 46.71	$ 51.88
Granted, shares	5,468	2,287
Granted, weighted-average grant date fair value	$ 41.92	$ 42.45	$ 25.51
Vested, shares	(2,361)	(2,356)
Vested, weighted-average grant date fair value	$ 52.86	$ 57.76
Forfeited, shares	(345)	(313)
Forfeited, weighted-average grant date fair value	$ 41.99	$ 43.13
Outstanding at end, shares	8,953	6,191	6,573
Outstanding at end, weighted-average grant date fair value	$ 42.34	$ 46.71	$ 51.88

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Equity-Based Compensation (Performance Awards Activity) (Details) (Performance Awards [Member], USD $) In Thousands, except Per Share data, unless otherwise specified	12 Months Ended
Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Performance Awards [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Outstanding at beginning, shares	1,120	430
Outstanding at beginning, weighted-average grant date fair value	$ 43.89	$ 24.14
Granted, shares	1,906	1,421
Granted, weighted-average grant date fair value	$ 42.28	$ 43.33	$ 19.46
Forfeited, shares	(173)	(716)
Forfeited, weighted-average grant date fair value	$ 42.9	$ 25.72
Paid out, shares	(224)	(15)
Paid out, weighted-average grant date fair value	$ 46.03	$ 64.57
Outstanding at end, shares	2,629	1,120	430
Outstanding at end, weighted-average grant date fair value	$ 42.52	$ 43.89	$ 24.14

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Regulatory Matters (Narrative) (Details) (USD $)	12 Months Ended
Dec. 31, 2011
Regulatory Matters [Abstract]
Minimum tier 1 risk-based capital ratio to be considered "well-capitalized"	6.00%
Minimum total risk-based capital ratio to be considered "well-capitalized"	10.00%
Tier 1 leverage ratio to be considered "well-capitalized"	5.00%
Average aggregate cash balances to satisfy reserve requirements	$ 3,600,000,000
Undistributed earnings	2,260,000,000
Maximum credit to any one affiliate as a percentage on its capital	10.00%
Maximum credit to all affiliates as a percentage on its capital	20.00%
Undistributed earnings of unconsolidated entities	$ 442,000,000

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Regulatory Matters (Regulatory Capital Ratios And Related Amounts) (Details) (USD $) In Millions, unless otherwise specified	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009	Dec. 31, 2008	Dec. 31, 2011 Statutory Minimum Requirement [Member]	Dec. 31, 2011 Standard Requirement Well Capitalized [Member]	Dec. 31, 2011 State Street [Member]	Dec. 31, 2010 State Street [Member]	Dec. 31, 2011 State Street Bank [Member]	Dec. 31, 2010 State Street Bank [Member]
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]
Tier 1 capital, ratio					4.00%	[1]	6.00%	[1]	18.80%	20.50%		17.60%	18.10%
Total capital, ratio					8.00%	[1]	10.00%	[1]	20.50%	22.00%		19.60%	19.90%
Tier 1 leverage ratio					4.00%	[1]	5.00%	[1]	7.30%	8.20%		6.70%	7.10%
Total shareholders' equity	$ 19,398	$ 17,787	$ 14,491	$ 12,774					$ 19,398	$ 17,787		$ 18,494	$ 16,697
Trust preferred capital securities									950	1,450
Net unrealized loss on available-for-sale securities and cash flow hedges									395	680		398	682
Deferred tax liability, associated with acquisitions									757	748		737	748
Recognition of pension plan funded status									248	186		245	187
Goodwill	5,645	5,597	4,550						5,645	5,597		5,353	5,365
Other intangible assets	2,459	2,593	1,810						2,459	2,593		2,297	2,460
Other deductions										336	[2]
Tier 1 capital									13,644	12,325		12,224	10,489
Qualifying subordinated debt									1,339	959		1,343	959
Allowances for on- and off-balance sheet credit exposures									40	116		40	117
Unrealized gain on available-for-sale equity securities	1,471	1,126								2
Tier 2 capital									1,379	1,077		1,383	1,076
Deductions for investments in finance subsidiaries									(181)	(171)
Total capital									14,842	13,231		13,607	11,565
On-balance sheet									52,642	46,209		49,659	44,103
Off-balance sheet									19,115	13,177		19,109	13,177
Market-risk equivalents									661	791		611	750
Total									72,418	60,177		69,379	58,030
Adjusted quarterly average assets									$ 186,336	$ 150,770		$ 183,086	$ 147,908
[1]	State Street Bank must comply with the regulatory guideline for "well capitalized" in order for the parent company to maintain its status as a financial holding company, including maintaining a minimum tier 1 risk-based capital ratio of 6%, a minimum total risk- based capital ratio of 10%, and a tier 1 leverage ratio of 5%. The "well capitalized" guideline requires us to maintain a minimum tier 1 risk-based capital ratio of 6% and a minimum total risk-based capital ratio of 10%.
[2]	Amounts included deferred tax assets not eligible for inclusion in regulatory capital.

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Derivative Financial Instruments (Narrative) (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
Dec. 31, 2011	Dec. 31, 2010
Derivative [Line Items]
Cash collateral received for derivative instruments	1,150	79
Cash collateral provided for derivative instruments	1,480	530
Derivative liability, fair value	911
Collateral already posted, aggregate fair value	276
Maximum additional amount of payments related to termination events	635
Fair Value Hedges [Member]
Derivative [Line Items]
Securities weighted-average life, years	7.4	7.7
Subordinated note matures	2018
Fair Value Hedges [Member] | 2.875% Senior Note [Member]
Derivative [Line Items]
Senior notes due	2016
Fixed interest rate	2.88%
Fair Value Hedges [Member] | 4.375% Senior Note [Member]
Derivative [Line Items]
Senior notes due	2021
Fixed interest rate	4.38%
Fair Value Hedges [Member] | 4.956% Subordinated Note [Member]
Derivative [Line Items]
Fixed interest rate	4.96%
Fair Value Hedges [Member] | 5.25% Subordinated Note [Member]
Derivative [Line Items]
Fixed interest rate	5.25%
Cash Flow Hedges [Member]
Derivative [Line Items]
Securities weighted-average life, years	2.8	3.8

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Derivative Financial Instruments (Schedule Of Outstanding Hedges: (Notional Amount)) (Details) (USD $) In Millions, unless otherwise specified	Dec. 31, 2011	Dec. 31, 2010
Derivative Instruments, Gain (Loss) [Line Items]
Notional Amount of Derivatives	$ 3,872	$ 1,886
Swap Agreements And Forwards [Member] | Interest-Rate Contracts [Member] | Derivatives Not Designated As Hedging Instruments [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Notional Amount of Derivatives	238,008	52,383
Swap Agreements [Member] | Designated As Hedging Instruments [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Notional Amount of Derivatives	3,872	1,886
Options And Caps Purchased [Member] | Interest-Rate Contracts [Member] | Derivatives Not Designated As Hedging Instruments [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Notional Amount of Derivatives	1,431	140
Options And Caps Written [Member] | Interest-Rate Contracts [Member] | Derivatives Not Designated As Hedging Instruments [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Notional Amount of Derivatives	1,324	130
Futures [Member] | Interest-Rate Contracts [Member] | Derivatives Not Designated As Hedging Instruments [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Notional Amount of Derivatives	66,620	25,253
Forward, Swap And Spot [Member] | Foreign Exchange Contracts [Member] | Derivatives Not Designated As Hedging Instruments [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Notional Amount of Derivatives	1,033,045	637,847
Forwards [Member] | Foreign Exchange Contracts [Member] | Designated As Hedging Instruments [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Notional Amount of Derivatives	2,613
Options Purchased [Member] | Foreign Exchange Contracts [Member] | Derivatives Not Designated As Hedging Instruments [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Notional Amount of Derivatives	11,215	14,299
Options Written [Member] | Foreign Exchange Contracts [Member] | Derivatives Not Designated As Hedging Instruments [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Notional Amount of Derivatives	12,342	14,587
Credit Default Swap Agreements [Member] | Credit Derivative Contracts [Member] | Derivatives Not Designated As Hedging Instruments [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Notional Amount of Derivatives	105	155
Stable Value Contracts [Member] | Other Contracts [Member] | Derivatives Not Designated As Hedging Instruments [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Notional Amount of Derivatives	$ 40,963	$ 46,758

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Derivative Financial Instruments (Notional Amount Of Interest Rate Swap Agreements Designated As Fair Value And Cash Flow Hedges) (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
Dec. 31, 2011	Dec. 31, 2010
Derivative [Line Items]
Notional Amount of Fair Value Hedges	$ 3,748		$ 1,761
Notional Amount of Cash Flow Hedges	124		125
Notional Amount of Derivatives	3,872		1,886
Increase in carrying value of long-term debt	140		81
Investment Securities Available For Sale [Member]
Derivative [Line Items]
Notional Amount of Fair Value Hedges	1,298		1,561
Notional Amount of Cash Flow Hedges	124		125
Notional Amount of Derivatives	1,422		1,686
Long-Term Debt [Member]
Derivative [Line Items]
Notional Amount of Fair Value Hedges	2,450	[1]	200	[1]
Notional Amount of Derivatives	$ 2,450	[1]	$ 200	[1]
[1]	As of December 31, 2011 and 2010, fair value hedges of long-term debt increased the carrying value of long-term debt presented in our consolidated statement of condition by $140 million and $81 million, respectively.

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Derivative Financial Instruments (Contractual And Weighted-Average Interest Rates, Which Include The Effects Of Hedges Related To Financial Instruments) (Details) (Long-Term Debt [Member])	12 Months Ended
Dec. 31, 2011	Dec. 31, 2010
Long-Term Debt [Member]
Derivative [Line Items]
Contractual Rates	3.64%	3.70%
Rate Including Impact of Hedges	3.22%	3.30%

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Derivative Financial Instruments (Schedule Of The Fair Values Of Derivative Financial Instruments) (Details) (USD $) In Millions, unless otherwise specified	Dec. 31, 2011	Dec. 31, 2010
Derivatives, Fair Value [Line Items]
Derivative Liability, Fair Value	$ 911
Derivatives Not Designated As Hedging Instruments [Member]
Derivatives, Fair Value [Line Items]
Derivative Asset, Fair Value	13,893	8,193
Derivative Liability, Fair Value	14,013	8,596
Derivatives Not Designated As Hedging Instruments [Member] | Foreign Exchange Contracts [Member]
Derivatives, Fair Value [Line Items]
Derivative Asset, Fair Value	12,210	8,058
Derivative Liability, Fair Value	12,315	8,455
Derivatives Not Designated As Hedging Instruments [Member] | Interest-Rate Contracts [Member]
Derivatives, Fair Value [Line Items]
Derivative Asset, Fair Value	1,682	133
Derivative Liability, Fair Value	1,688	131
Derivatives Not Designated As Hedging Instruments [Member] | Other Derivative Contracts [Member]
Derivatives, Fair Value [Line Items]
Derivative Asset, Fair Value	1
Derivative Liability, Fair Value	10
Derivatives Not Designated As Hedging Instruments [Member] | Credit Derivative Contracts [Member]
Derivatives, Fair Value [Line Items]
Derivative Asset, Fair Value		2
Derivative Liability, Fair Value		10
Designated As Hedging Instruments [Member]
Derivatives, Fair Value [Line Items]
Derivative Asset, Fair Value	126	32
Derivative Liability, Fair Value	330	228
Designated As Hedging Instruments [Member] | Foreign Exchange Contracts [Member]
Derivatives, Fair Value [Line Items]
Derivative Asset, Fair Value	3
Derivative Liability, Fair Value	37
Designated As Hedging Instruments [Member] | Interest-Rate Contracts [Member]
Derivatives, Fair Value [Line Items]
Derivative Asset, Fair Value	123	32
Derivative Liability, Fair Value	$ 293	$ 228

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Derivative Financial Instruments (Impact Of Derivatives On Consolidated Statement Of Income) (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Derivative [Line Items]
Losses on written options recorded in other expense			$ 5		$ 9
Derivatives Designated As Fair Value Hedges [Member]
Derivative [Line Items]
Amount of Gain (Loss) on Derivative Recognized in Consolidated Statement of Income	(251)		14		148
Amount of Gain (Loss) on Hedged Item Recognized in Consolidated Statement of Income	244		(9)		(156)
Derivatives Designated As Fair Value Hedges [Member] | Processing Fees And Other Revenue [Member] | Deposits [Member]
Derivative [Line Items]
Amount of Gain (Loss) on Hedged Item Recognized in Consolidated Statement of Income					22
Derivatives Designated As Fair Value Hedges [Member] | Processing Fees And Other Revenue [Member] | Long-Term Debt [Member]
Derivative [Line Items]
Amount of Gain (Loss) on Hedged Item Recognized in Consolidated Statement of Income	(70)		(49)		30
Derivatives Designated As Fair Value Hedges [Member] | Processing Fees And Other Revenue [Member] | Investment Securities Available For Sale [Member]
Derivative [Line Items]
Amount of Gain (Loss) on Hedged Item Recognized in Consolidated Statement of Income	153		40		(208)
Derivatives Not Designated As Hedging Instruments [Member]
Derivative [Line Items]
Amount of Gain (Loss) on Derivative Recognized in Consolidated Statement of Income	669	[1]	631	[1]	674	[1]
Interest-Rate Contracts [Member] | Derivatives Designated As Fair Value Hedges [Member] | Processing Fees And Other Revenue [Member] | Contract One [Member]
Derivative [Line Items]
Amount of Gain (Loss) on Derivative Recognized in Consolidated Statement of Income					(22)
Interest-Rate Contracts [Member] | Derivatives Designated As Fair Value Hedges [Member] | Processing Fees And Other Revenue [Member] | Contract Two [Member]
Derivative [Line Items]
Amount of Gain (Loss) on Derivative Recognized in Consolidated Statement of Income	75		57		(30)
Interest-Rate Contracts [Member] | Derivatives Designated As Fair Value Hedges [Member] | Processing Fees And Other Revenue [Member] | Contract Three [Member]
Derivative [Line Items]
Amount of Gain (Loss) on Derivative Recognized in Consolidated Statement of Income	(165)		(43)		200
Interest-Rate Contracts [Member] | Derivatives Not Designated As Hedging Instruments [Member] | Processing Fees And Other Revenue [Member]
Derivative [Line Items]
Amount of Gain (Loss) on Derivative Recognized in Consolidated Statement of Income			10	[1]	5	[1]
Interest-Rate Contracts [Member] | Derivatives Not Designated As Hedging Instruments [Member] | Trading Services Revenue [Member]
Derivative [Line Items]
Amount of Gain (Loss) on Derivative Recognized in Consolidated Statement of Income	21	[1]	7	[1]
Foreign Exchange Contracts [Member] | Derivatives Designated As Fair Value Hedges [Member] | Processing Fees And Other Revenue [Member]
Derivative [Line Items]
Amount of Gain (Loss) on Derivative Recognized in Consolidated Statement of Income	(161)
Foreign Exchange Contracts [Member] | Derivatives Designated As Fair Value Hedges [Member] | Processing Fees And Other Revenue [Member] | Investment Securities [Member]
Derivative [Line Items]
Amount of Gain (Loss) on Hedged Item Recognized in Consolidated Statement of Income	161
Foreign Exchange Contracts [Member] | Derivatives Not Designated As Hedging Instruments [Member] | Processing Fees And Other Revenue [Member]
Derivative [Line Items]
Amount of Gain (Loss) on Derivative Recognized in Consolidated Statement of Income	7	[1]	(4)	[1]	(5)	[1]
Foreign Exchange Contracts [Member] | Derivatives Not Designated As Hedging Instruments [Member] | Trading Services Revenue [Member]
Derivative [Line Items]
Amount of Gain (Loss) on Derivative Recognized in Consolidated Statement of Income	641	[1]	618	[1]	677	[1]
Other Derivative Contracts [Member] | Derivatives Not Designated As Hedging Instruments [Member] | Trading Services Revenue [Member]
Derivative [Line Items]
Amount of Gain (Loss) on Derivative Recognized in Consolidated Statement of Income					$ (3)	[1]
[1]	Losses on derivatives related to book-value protection provided to stable value funds are recorded in other expenses, and totaled approximately $5 million, and $9 million, respectively, for the years ended December 31, 2010 and 2009. There were no losses related to stable value funds for the year ended December 31, 2011.

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Derivative Financial Instruments (Schedule Of Differences Between The Gains (Losses) On The Derivative And The Gains (Losses) On The Hedged Item) (Details) (Derivatives Designated as Cash Flow Value Hedges [Member], USD $) In Millions, unless otherwise specified	12 Months Ended
Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Derivative [Line Items]
Amount of Gain (Loss) on Derivative Recognized in Other Comprehensive Income	$ 9	$ 7	$ 14
Amount of Gain (Loss) Reclassified from OCI to Consolidated Statement of Income	(7)	(7)
Amount of Gain (Loss) on Derivative Recognized in Consolidated Statement of Income	3	5
Net Interest Revenue [Member]
Derivative [Line Items]
Amount of Gain (Loss) Reclassified from OCI to Consolidated Statement of Income	(7)	(7)
Amount of Gain (Loss) on Derivative Recognized in Consolidated Statement of Income	3	5
Interest-Rate Contracts [Member]
Derivative [Line Items]
Amount of Gain (Loss) on Derivative Recognized in Other Comprehensive Income	$ 9	$ 7	$ 14

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Net Interest Revenue (Components Of Interest Revenue And Interest Expenses) (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Net Interest Revenue [Abstract]
Deposits with banks	$ 149		$ 93		$ 156
U.S. Treasury and federal agencies	775		682		520
State and political subdivisions	221		222		225
Other investments	1,493		2,109		2,075
Securities purchased under resale agreements and federal funds sold	28		24		24
Loans and leases	278	[1]	329	[1]	239	[1]
Trading account assets					20
Interest revenue associated with AMLF					25	[2]
Other interest-earning assets	2		3		2
Total interest revenue	2,946		3,462		3,286
Deposits	220		213		195
Short-term borrowings	96	[1]	257	[1]	200	[1]
Long-term debt	289		286		304
Interest expense associated with AMLF					18	[2]
Other interest-bearing liabilities	8		7		5
Total interest expense	613		763		722
Net interest revenue	2,333		2,699		2,564
Interest expense included in short-term borrowings relating to third-party asset-backed securitization trusts			$ 67
[1]	Amounts for 2010 included $67 million of interest revenue and interest expense related to the third-party asset-backed securitization trusts consolidated into our financial statements on January 1, 2010 in connection with our adoption of new GAAP. These trusts were de-consolidated in June 2010.
[2]	Refers to the Federal Reserve's Asset-Backed Commercial Paper Money Market Mutual Fund Liquidity Facility, or AMLF, which expired in February 2010.

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Employee Benefits (Narrative) (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended			12 Months Ended		12 Months Ended
Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009	Dec. 31, 2011 Accumulated Defined Benefit Plans Adjustment [Member]	Dec. 31, 2010 Accumulated Defined Benefit Plans Adjustment [Member]	Dec. 31, 2011 U.S. Pension Plan [Member]	Dec. 31, 2010 U.S. Pension Plan [Member]	Dec. 31, 2012 Primary U.S. And Non-U.S. Defined Benefit Plans [Member]	Dec. 31, 2011 Primary U.S. And Non-U.S. Defined Benefit Plans [Member]	Dec. 31, 2010 Primary U.S. And Non-U.S. Defined Benefit Plans [Member]	Dec. 31, 2012 SERPs [Member]	Dec. 31, 2011 DC SERP [Member]	Dec. 31, 2010 DC SERP [Member]	Dec. 31, 2009 DC SERP [Member]	Dec. 31, 2012 Post-Retirement Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Long-term rate of return on plan assets						7.25%			7.25%	7.25%
Expected employer contributions to U.S. and Non-U.S. defined benefit pension plans, SERPs and post-retirement plan								$ 7			$ 27				$ 6
Accumulated benefit obligation	960	231				872	784
Plan assets	674	50		671	36
Projected benefit obligations	981	263	263
Health care cost trend rates increase	1.00%
Health care cost trend rates decrease	1.00%
Post-retirement benefit obligation increase	7.00%
Post-retirement benefit obligation decrease	6.00%
Aggregate expense for service and interest costs increase	10.00%
Aggregate expense for service and interest costs decrease	9.00%
Expenses related to pre-tax salary- U.S employees	77	71	73
Expenses related to pre-tax salary- Non-U.S employees	65	45	45
Recorded compensation and employee benefits expense	$ 103	$ 95	$ 50									$ 10	$ 10	$ 10

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Employee Benefits (Combined Information For The U.S. And Non-U.S. Defined Benefit Plans And Post-Retirement Plan) (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Primary U.S. And Non-U.S. Defined Benefit Plans [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan, benefit obligation, beginning balance	$ 905	$ 808
Service cost	9	11	13
Interest cost	47	44	45
Employee contributions	1	1
Plan amendments	(4)
Acquisitions and transfers	30	3
Actuarial gain (losses)	67	72
Benefits paid	(28)	(28)
Settlements	(1)	(2)
Foreign currency translation	(8)	(4)
Adjustment for rounding
Defined benefit plan, benefit obligation, ending balance	1,017	905	808
Defined benefit plan, fair value of plan assets, beginning balance	884	828
Actual return on plan assets	50	84
Employer contributions	8	8
Acquisitions and transfers	21	(2)
Expenses paid	(1)
Plan settlements	(1)	(2)
Foreign currency translation	(5)	(4)
Defined benefit plan, fair value of plan assets, ending balance	928	884	828
Funded status (plan assets less benefit obligations)	(89)	(21)
Net accrued benefit expense	(89)	(21)
Post-Retirement Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan, benefit obligation, beginning balance	114	112
Service cost	6	5	4
Interest cost	6	6	6
Employee contributions
Actuarial gain (losses)	(5)	(4)
Benefits paid	(9)	(7)
Settlements
Foreign currency translation
Adjustment for rounding		2
Defined benefit plan, benefit obligation, ending balance	112	114	112
Defined benefit plan, fair value of plan assets, beginning balance
Employer contributions	9	7
Plan settlements
Foreign currency translation
Defined benefit plan, fair value of plan assets, ending balance
Funded status (plan assets less benefit obligations)	(112)	(114)
Net accrued benefit expense	$ (112)	$ (114)

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Employee Benefits (Amounts Recognized In The Consolidated Statement Of Condition) (Details) (USD $) In Millions, unless otherwise specified	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009	Dec. 31, 2011 Primary U.S. And Non-U.S. Defined Benefit Plans [Member]	Dec. 31, 2010 Primary U.S. And Non-U.S. Defined Benefit Plans [Member]	Dec. 31, 2011 Post-Retirement Plan [Member]	Dec. 31, 2010 Post-Retirement Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Non-current assets				$ 45	$ 26
Current liabilities				(1)	(2)	(6)	(9)
Noncurrent liabilities				(133)	(45)	(106)	(105)
Net accrued amount recognized in statement of condition				(89)	(21)	(112)	(114)
Prior service credit					(4)	3	4
Net loss				(307)	(242)	(36)	(43)
Accumulated other comprehensive loss	(659)	(689)	(2,238)	(307)	(246)	(33)	(39)
Cumulative employer contributions in excess of net periodic benefit cost				218	225	(79)	(75)
Net obligation recognized in consolidated statement of condition				(89)	(21)	(112)	(114)
Accumulated benefit obligation				$ 999	$ 887
Used to determine benefit obligations, Discount rate				4.50%	5.50%	4.50%	5.50%
Used to determine benefit obligations, Rate of increase for future compensation					4.50%
Used to determine periodic benefit cost, Discount rate				5.50%	6.00%	5.50%	6.00%
Used to determine periodic benefit cost, Rate of increase for future compensation				4.50%	4.50%
Used to determine periodic benefit cost, Expected long-term rate of return on plan assets				7.25%	7.25%
Assumed health care cost trend rates, Cost trend rate assumed for next year						7.80%	7.62%
Assumed health care cost trend rates, Rate to which the cost trend rate is assumed to decline						4.50%	4.50%
Assumed health care cost trend rates, Year that the rate reaches the ultimate trend rate						2029	2026

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Employee Benefits (Expected Benefit Payments) (Details) (USD $) In Millions, unless otherwise specified	Dec. 31, 2011
Primary U.S. And Non-U.S. Defined Benefit Plans [Member]
Defined Benefit Plan Disclosure [Line Items]
2012	$ 33
2013	33
2014	34
2015	35
2016	27
2017-2021	169
Non-Qualified SERPs [Member]
Defined Benefit Plan Disclosure [Line Items]
2012	27
2013	13
2014	12
2015	14
2016	13
2017-2021	59
Post-Retirement Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
2012	6
2013	6
2014	7
2015	7
2016	7
2017-2021	$ 35

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Employee Benefits (Plan's Assets Measured At Fair Value On A Recurring Basis) (Details) (USD $) In Millions, unless otherwise specified	Dec. 31, 2011	Dec. 31, 2010
U.S. Pension Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Domestic large cap equity	$ 129	$ 120
Domestic small cap equity	14	15
Developed international equities	62	67
Emerging markets equity	28	38
Investment grade fixed-income	311	308
High yield fixed-income	26	31
Real estate investment trusts	23	21
Alternative investments (commingled fund)	5	5
Alternative investments (fund of funds)	14	14
Private equity	2	2
Cash	6	9
Total U.S. Pension Plan	620	630
U.K. Pension Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Developed international equities	24	33
U.K. fixed-income	187	144
Emerging market index	8	8
Alternative investments	32	33
Total U.K. pension plan	251	218
Other Non-U.S. Pension Plans (Excluding U.K.) [Member]
Defined Benefit Plan Disclosure [Line Items]
Insurance group annuity contracts	57	36
Total Other Non-U.S. Pension Plans (Excluding U.K.)	57	36
Total assets carried at fair value	928	884
Quoted Market Prices In Active Markets (Level 1) [Member] | U.S. Pension Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Domestic large cap equity
Domestic small cap equity
Developed international equities
Emerging markets equity
Investment grade fixed-income
High yield fixed-income
Real estate investment trusts
Alternative investments (commingled fund)
Alternative investments (fund of funds)
Private equity
Cash
Total U.S. Pension Plan
Quoted Market Prices In Active Markets (Level 1) [Member] | U.K. Pension Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Developed international equities
U.K. fixed-income
Emerging market index
Alternative investments
Total U.K. pension plan
Quoted Market Prices In Active Markets (Level 1) [Member] | Other Non-U.S. Pension Plans (Excluding U.K.) [Member]
Defined Benefit Plan Disclosure [Line Items]
Insurance group annuity contracts
Total Other Non-U.S. Pension Plans (Excluding U.K.)
Total assets carried at fair value
Pricing Methods With Significant Observable Market Inputs (Level 2) [Member] | U.S. Pension Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Domestic large cap equity	129	120
Domestic small cap equity	14	15
Developed international equities	62	67
Emerging markets equity	28	38
Investment grade fixed-income	311	308
High yield fixed-income	26	31
Real estate investment trusts	23	21
Cash	6	9
Total U.S. Pension Plan	599	609
Pricing Methods With Significant Observable Market Inputs (Level 2) [Member] | U.K. Pension Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Developed international equities	24	33
U.K. fixed-income	187	144
Emerging market index	8	8
Total U.K. pension plan	219	185
Pricing Methods With Significant Observable Market Inputs (Level 2) [Member] | Other Non-U.S. Pension Plans (Excluding U.K.) [Member]
Defined Benefit Plan Disclosure [Line Items]
Total assets carried at fair value	818	794
Pricing Methods With Significant Unobservable Market Inputs (Level 3) [Member] | U.S. Pension Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Alternative investments (commingled fund)	5	5
Alternative investments (fund of funds)	14	14
Private equity	2	2
Total U.S. Pension Plan	21	21
Pricing Methods With Significant Unobservable Market Inputs (Level 3) [Member] | U.K. Pension Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Alternative investments	32	33
Total U.K. pension plan	32	33
Pricing Methods With Significant Unobservable Market Inputs (Level 3) [Member] | Other Non-U.S. Pension Plans (Excluding U.K.) [Member]
Defined Benefit Plan Disclosure [Line Items]
Insurance group annuity contracts	57	36
Total Other Non-U.S. Pension Plans (Excluding U.K.)	57	36
Total assets carried at fair value	$ 110	$ 90

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Employee Benefits (Fair Value Measurements Using Significant Unobservable Inputs) (Details) (USD $) In Millions, unless otherwise specified	Dec. 31, 2011 U.S. Pension Plan [Member] Private Equity [Member]	Dec. 31, 2010 U.S. Pension Plan [Member] Private Equity [Member]	Dec. 31, 2009 U.S. Pension Plan [Member] Private Equity [Member]	Dec. 31, 2010 U.S. Pension Plan [Member] Alternative Investments [Member]	Dec. 31, 2011 U.S. Pension Plan [Member] Alternative Investments [Member]	Dec. 31, 2011 U.K. Pension Plan [Member] Alternative Investments [Member]	Dec. 31, 2010 U.K. Pension Plan [Member] Alternative Investments [Member]	Dec. 31, 2011 Non-US Pension Plan (Excluding U.K.) [Member] Insurance Group Annuity Contract [Member]	Dec. 31, 2010 Non-US Pension Plan (Excluding U.K.) [Member] Insurance Group Annuity Contract [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair Value, beginning balance, Assets	$ 2	$ 2	$ 2	$ 13	$ 19	$ 33	$ 24	$ 36	$ 31
Purchases and sales, net				4		(1)	7	24	1
Unrealized gains (losses)				2			2	(3)	4
Fair Value, ending balance, Assets	$ 2	$ 2	$ 2	$ 19	$ 19	$ 32	$ 33	$ 57	$ 36

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Employee Benefits (Defined Pension Benefits In Excess Of Qualified Plan Limits, Information For The SERPs) (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Non-Qualified SERPs [Member]
Defined Benefit Plan Disclosure [Line Items]
Beginning of year	$ 173	$ 165	$ 182
Service cost	1	1	2
Interest cost	8	10	10
Actuarial gain (losses)	23	(2)
Benefits paid	(2)	(2)
Settlements	(22)	(24)
Defined benefit plan, benefit obligation, ending balance	173	165	182
Funded status (plan assets less benefit obligations)	(173)	(165)
Net accrued benefit expense	(173)	(165)
Current liabilities	(27)	(27)
Non-current liabilities	(146)	(138)
Net accrued amount recognized in consolidated statement of condition	(173)	(165)
Net loss	(58)	(45)
Accumulated other comprehensive loss	(58)	(45)
Cumulative employer contributions in excess of net periodic benefit cost	(115)	(120)
Net obligation recognized in consolidated statement of condition	(173)	(165)
Accumulated benefit obligation	$ 173	$ 165
SERPs [Member]
Defined Benefit Plan Disclosure [Line Items]
Used to determine benefit obligations, Rate of increase for future compensation		4.75%
Executive SERPs [Member]
Defined Benefit Plan Disclosure [Line Items]
Used to determine benefit obligations, Rate of increase for future compensation	10.00%	10.00%

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Employee Benefits (The Actuarially Determined Expense For U.S. And Non-U.S. Defined Benefit Plans, Post-Retirement Plan And SERPs) (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Primary U.S. And Non-U.S. Defined Benefit Plans [Member]
Defined Benefit Plan Disclosure [Line Items]
Service cost	$ 9	$ 11	$ 13
Interest cost	47	44	45
Assumed return on plan assets	(58)	(55)	(56)
Amortization of net loss	12	7	6
Net periodic benefit cost	10	7	8
Settlements			(1)
Curtailments			(1)
Special termination benefits
Total expense	10	7	6
Net loss	(17)	(13)	(7)
Estimated amortization	(17)	(13)	(7)
Post-Retirement Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Service cost	6	5	4
Interest cost	6	6	6
Assumed return on plan assets
Amortization of net loss	1	2	1
Net periodic benefit cost	13	13	11
Settlements
Special termination benefits			1
Total expense	13	13	12
Net loss	(1)	(2)	(2)
Estimated amortization	(1)	(2)	(2)
Non-Qualified SERPs [Member]
Defined Benefit Plan Disclosure [Line Items]
Service cost	1	1	2
Interest cost	8	10	10
Amortization of net loss	3	5	3
Net periodic benefit cost	12	16	15
Total expense	19	24	19
Net loss	(5)	(3)	(5)
Estimated amortization	(5)	(3)	(5)
Other Pension Plans, Postretirement Or Supplemental Plans, Defined Benefit [Member] | Non-Qualified SERPs [Member]
Defined Benefit Plan Disclosure [Line Items]
Settlements	$ 7	$ 8	$ 4

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Occupancy Expense And Information Systems And Communications Expense (Narrative) (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
Dec. 31, 2011 sqft years	Dec. 31, 2010	Dec. 31, 2009
Occupancy Expense And Information Systems And Communications Expense [Abstract]
Total depreciation expense	$ 368	$ 373	$ 380
Leased Area, square feet	1,025,000
Underground parking garage, square feet	366,000
Non-cancelable capital leases Period	20
Subleased building, square feet	153,390
Non-cancelable lease maturity date	September 2023
Leased area of office building, square feet	362,000
Capital lease period	20
Capital lease maturity date	December 2028
Period for cancellation of capital lease	15
Net book value of capital leases with the related liability recorded in long term debt	565	606
Interest expense related to capital lease obligations	43	44	47
Accumulated amortization of assets related to capital leases	273	230
Rental expense, net of sublease revenue	232	241	230
Sublease revenue	12	12	17
Future minimum sublease rental commitments for capital lease	32
Future minimum sublease rental commitments for operating lease	$ 19

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Occupancy Expense And Information Systems And Communications Expense (Summary of Future Minimum Lease Payments Under Non-Cancelable Capital and Operating Leases) (Details) (USD $) In Millions, unless otherwise specified	Dec. 31, 2011
Occupancy Expense And Information Systems And Communications Expense [Abstract]
2012, Capital Leases	$ 68
2013, Capital Leases	68
2014, Capital Leases	68
2015, Capital Leases	67
2016, Capital Leases	71
Thereafter, Capital Leases	647
Total minimum lease payments, Capital Leases	989
Less amount representing interest payments, Capital Leases	(327)
Present value of minimum lease payments, Capital Leases	662
2012, Operating Leases	237
2013, Operating Leases	207
2014, Operating Leases	182
2015, Operating Leases	132
2016, Operating Leases	96
Thereafter, Operating Leases	275
Total minimum lease payments, Operating Leases	1,129
2012, Total	305
2013, Total	275
2014, Total	250
2015, Total	199
2016, Total	167
Thereafter, Total	922
Total minimum lease payments, Total	$ 2,118

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Acquisition And Restructuring Costs (Narrative) (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended	12 Months Ended
Dec. 31, 2011 employees	Dec. 31, 2011	Dec. 31, 2010 employees	Dec. 31, 2009
Business Acquisition [Line Items]
Acquisition and restructuring costs		$ 16	$ 89	$ 49
Additional restructuring-related accruals		133	156
Number of employees involuntarily terminated	442	782	1,400
Percentage of global workforce		5.00%
Tax benefit related to acquisition		55
Restructuring charges	120	253	156
Intesa, Mourant International Finance Administration And BIAM [Member]
Business Acquisition [Line Items]
Acquisition and restructuring costs		71
Business Operations And Information Technology Transformation Program [Member]
Business Acquisition [Line Items]
Number of employees involuntarily terminated		530
Restructuring charges		133
Employee Severance [Member]
Business Acquisition [Line Items]
Number of employees involuntarily terminated		1,930
Involuntarily Terminated [Member]
Business Acquisition [Line Items]
Number of employees involuntarily terminated		1,332
Pre-Tax Restructuring Charges [Member]
Business Acquisition [Line Items]
Additional restructuring-related accruals		289
Withdrawal From Fixed-Income Trading Initiative [Member]
Business Acquisition [Line Items]
Restructuring charges		$ 120
Expenses Control Measures [Member]
Business Acquisition [Line Items]
Number of employees involuntarily terminated		15

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Acquisition And Restructuring Costs (Costs Related To Acquisition And Restructuring) (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended	12 Months Ended
Dec. 31, 2011	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Acquisition And Restructuring Costs [Abstract]
Acquisition costs		$ 16	$ 89	$ 49
Restructuring charges	120	253	156
Total		$ 269	$ 245	$ 49

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Acquisition And Restructuring Costs (Activity Related To Restructuring-Related Accruals) (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
Dec. 31, 2011	Dec. 31, 2010
Business Acquisition [Line Items]
Beginning balance	$ 137
Additional restructuring-related accruals	133	156
Accruals for expense control measures	120
Payments	(103)	(19)
Ending balance	287	137
Employee-Related Costs [Member]
Business Acquisition [Line Items]
Beginning balance	90
Additional restructuring-related accruals	85	105
Accruals for expense control measures	62
Payments	(75)	(15)
Ending balance	162	90
Real Estate Consolidation [Member]
Business Acquisition [Line Items]
Beginning balance	47
Additional restructuring-related accruals	7	51
Payments	(15)	(4)
Ending balance	39	47
Information Technology Costs [Member]
Business Acquisition [Line Items]
Additional restructuring-related accruals	41
Payments	(8)
Ending balance	33
Trading Portfolio [Member]
Business Acquisition [Line Items]
Accruals for expense control measures	38
Ending balance	38
Asset And Other Write-Offs [Member]
Business Acquisition [Line Items]
Accruals for expense control measures	20
Payments	(5)
Ending balance	$ 15

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Other Expenses (Details) (USD $) In Millions, except Per Share data, unless otherwise specified	3 Months Ended	12 Months Ended
Jun. 30, 2010	Dec. 31, 2010	Dec. 31, 2009	Dec. 31, 2007
Other Expenses [Abstract]
Aggregate pre-tax securities lending charge		$ 414
Legal costs		9	250
Net asset value per underlying cash collateral pools	$ 1
One-time cash contribution to the SSgA lending funds		330
Increase in litigation reserve				250
Provision for legal fees			250
Reserve for decline in market value of collateral securities	$ 75

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Income Taxes (Narrative) (Details) (USD $)	12 Months Ended
Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Income Tax Contingency [Line Items]
Income tax benefit associated with the extraordinary loss			$ 2,410,000,000
Income tax expense (benefit) related to net gains (losses) from sales of investment securities	55,000,000	(98,000,000)	147,000,000
Income (loss) from continuing operations before income taxes, foreign	1,700,000,000	1,340,000,000	801,000,000
Investment of retained earnings	2,200,000,000
Deferred tax assets, operating loss carryforwards	34,000,000	26,000,000
Tax positions for which the ultimate deductibility is highly certain but time is uncertain	112,000,000
Interest and penalties expense			3,000,000
Interest expense	10,000,000
Interest accrued	8,000,000	65,000,000
Unrecognized Tax Benefits, Decreases Resulting from Settlements with Taxing Authorities	1,000,000	33,000,000
IRS Audit Of The Tax Years 2000 - 2006 [Member]
Income Tax Contingency [Line Items]
Unrecognized Tax Benefits, Decreases Resulting from Settlements with Taxing Authorities	$ 44,000,000
Maximum [Member]
Income Tax Contingency [Line Items]
Operating loss carryforwards expiration dates	2031
Minimum [Member]
Income Tax Contingency [Line Items]
Operating loss carryforwards expiration dates	2012

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Income Taxes (Schedule Of Components Of Income Tax Expense) (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Income Taxes [Abstract]
Federal	$ 49	$ (885)	$ 75
State	54	15	39
Non-U.S.	295	156	157
Total current expense (benefit)	398	(714)	271
Federal	134	745	383
State	8	141	28
Non-U.S.	76	358	40
Total deferred expense (benefit)	218	1,244	451
Total income tax expense	$ 616	$ 530	$ 722

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Income Taxes (Schedule Of Components Of Deferred Tax Liabilities and Assets) (Details) (USD $) In Millions, unless otherwise specified	Dec. 31, 2011	Dec. 31, 2010
Income Taxes [Abstract]
Lease financing transactions	$ 397	$ 463
Fixed and intangible assets	1,067	1,029
Other	21	122
Total deferred tax liabilities	1,485	1,614
Foreign currency translation	2	70
Unrealized losses on securities, net	651	1,083
Deferred compensation	162	183
Defined benefit pension plan	180	121
Expenses	141	177
Real estate	28	33
Other	104	137
Total deferred tax assets	1,268	1,804
Valuation allowance for deferred tax assets	(19)	(18)
Deferred tax assets, net of valuation allowance	$ 1,249	$ 1,786

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Income Taxes (Schedule Of Reconciliation Of The U.S. Statutory Income Tax Rate To The Effective Tax Rate) (Details)	12 Months Ended
Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Income Taxes [Abstract]
U.S. federal income tax rate	35.00%		35.00%		35.00%
State taxes, net of federal benefit	2.00%		1.20%		1.70%
Tax-exempt income	(2.90%)		(3.60%)		(3.10%)
Tax credits	(1.50%)		(1.30%)		(1.60%)
Foreign tax differential	(4.30%)		(3.60%)		(5.00%)
Transactions related to investment securities	(4.10%)	[1]	(2.30%)	[1]
Non-deductible penalty					1.00%
Other, net	0.10%				0.60%
Effective tax rate	24.30%		25.40%		28.60%
[1]	Amounts for both years represented the effect of discrete tax benefits related to the cost to terminate funding obligations that supported former conduit asset structures; the amount for 2010 also included the partial write-off of a deferred tax asset associated with certain of the investment securities sold in connection with our December 2010 investment portfolio repositioning.

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Income Taxes (Summary Of Activity Related To Unrecognized Tax Benefits) (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
Dec. 31, 2011	Dec. 31, 2010
Income Taxes [Abstract]
Unrecognized tax benefits, beginning balance	$ 446	$ 386
Increase (Decrease) related to agreements with tax authorities	(322)	27
Increase related to tax positions taken during current year	1	33
Unrecognized tax benefits, ending balance	$ 125	$ 446

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Earnings Per Common Share (Computation Of Basic And Diluted Earnings Per Share) (Details) (USD $) In Millions, except Share data in Thousands, unless otherwise specified	12 Months Ended
Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Earnings Per Common Share [Abstract]
Net income before extraordinary loss	$ 1,920		$ 1,556		$ 1,803
Less: Prepayment and accretion of preferred stock discount					(117)
Less: Preferred stock dividends	(20)				(46)
Less: Dividends and undistributed earnings allocated to participating securities	(18)	[1]	(16)	[1]
Net income before extraordinary loss available to common shareholders	$ 1,882		$ 1,540		$ 1,640
Basic average shares	492,598		495,394		470,602
Effect of dilutive securities: stock options and stock awards	3,474		2,530		3,401
Diluted average shares	496,072		497,924		474,003
Anti-dilutive securities	2,382	[2]	10,316	[2]	12,904	[2]
Earnings per share: Basic	$ 3.82		$ 3.11		$ 3.5
Earnings per share: Diluted	$ 3.79	[3]	$ 3.09	[3]	$ 3.46	[3]
[1]	Represented the portion of net income available to common equity allocated to participating securities; participating securities, composed of unvested restricted stock and director stock, have non-forfeitable rights to dividends during the vesting period on a basis equivalent to dividends paid to common shareholders.
[2]	Represented stock options, restricted stock and other securities outstanding but not included in the computation of diluted average shares because their effect was anti-dilutive.
[3]	Calculations for 2011 and 2010 reflected the allocation of earnings to participating securities using the two-class method, as this computation was more dilutive than the calculation using the treasury stock method.

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Line Of Business Information (Details) (USD $)	12 Months Ended
Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Line Of Business Information [Line Items]
Lines of business	2
Servicing fees	$ 4,382,000,000	$ 3,938,000,000	$ 3,334,000,000
Management fees	917,000,000	829,000,000	766,000,000
Trading services	1,220,000,000	1,106,000,000	1,094,000,000
Securities finance	378,000,000	318,000,000	570,000,000
Processing fees and other	297,000,000	349,000,000	171,000,000
Total fee revenue	7,194,000,000	6,540,000,000	5,935,000,000
Net interest revenue	2,333,000,000	2,699,000,000	2,564,000,000
Gains (Losses) related to investment securities, net	67,000,000	(286,000,000)	141,000,000
Total revenue	9,594,000,000	8,953,000,000	8,640,000,000
Provision for loan losses		25,000,000	149,000,000
Expenses from operations	6,789,000,000	6,183,000,000	5,667,000,000
Securities lending charge		414,000,000
Provision for fixed-income litigation exposure			250,000,000
Acquisition costs	16,000,000	89,000,000	49,000,000
Restructuring charges	253,000,000	156,000,000
Total expenses	7,058,000,000	6,842,000,000	5,966,000,000
Income from continuing operations before income taxes	2,536,000,000	2,086,000,000	2,525,000,000
Pre-tax margin	26.00%	23.00%	29.00%
Average assets	174,800,000,000	152,000,000,000	146,800,000,000
Percentage of affiliate owned	50.00%
Restructuring Accruals Other	133,000,000	156,000,000
Restructuring Reserve, Accrual Adjustment	120,000,000
Investment Servicing [Member]
Line Of Business Information [Line Items]
Servicing fees	4,382,000,000	3,938,000,000	3,334,000,000
Trading services	1,220,000,000	1,106,000,000	1,094,000,000
Securities finance	333,000,000	265,000,000	387,000,000
Processing fees and other	195,000,000	225,000,000	72,000,000
Total fee revenue	6,130,000,000	5,534,000,000	4,887,000,000
Net interest revenue	2,181,000,000	2,553,000,000	2,489,000,000
Gains (Losses) related to investment securities, net	67,000,000	58,000,000	141,000,000
Total revenue	8,378,000,000	8,145,000,000	7,517,000,000
Provision for loan losses		25,000,000	148,000,000
Expenses from operations	5,889,000,000	5,430,000,000	4,920,000,000
Securities lending charge		75,000,000
Total expenses	5,889,000,000	5,505,000,000	4,920,000,000
Income from continuing operations before income taxes	2,489,000,000	2,615,000,000	2,449,000,000
Pre-tax margin	30.00%	32.00%	33.00%
Average assets	169,400,000,000	146,900,000,000	143,700,000,000
Investment Management [Member]
Line Of Business Information [Line Items]
Management fees	917,000,000	829,000,000	766,000,000
Securities finance	45,000,000	53,000,000	183,000,000
Processing fees and other	102,000,000	124,000,000	99,000,000
Total fee revenue	1,064,000,000	1,006,000,000	1,048,000,000
Net interest revenue	152,000,000	146,000,000	68,000,000
Total revenue	1,216,000,000	1,152,000,000	1,116,000,000
Provision for loan losses			1,000,000
Expenses from operations	900,000,000	753,000,000	747,000,000
Securities lending charge		339,000,000
Provision for fixed-income litigation exposure			250,000,000
Total expenses	900,000,000	1,092,000,000	997,000,000
Income from continuing operations before income taxes	316,000,000	60,000,000	118,000,000
Pre-tax margin	26.00%	5.00%	11.00%
Average assets	5,400,000,000	5,100,000,000	3,100,000,000
Other [Member]
Line Of Business Information [Line Items]
Net interest revenue			7,000,000
Gains (Losses) related to investment securities, net		(344,000,000)
Total revenue		(344,000,000)	7,000,000
Acquisition costs	16,000,000	89,000,000	49,000,000
Restructuring charges	253,000,000	156,000,000
Total expenses	269,000,000	245,000,000	49,000,000
Income from continuing operations before income taxes	$ (269,000,000)	$ (589,000,000)	$ (42,000,000)

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Non-U.S. Activities (Schedule Of Results From Non-U.S. Operations) (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Segment Reporting Information [Line Items]
Total fee revenue	$ 7,194	$ 6,540	$ 5,935
Net interest revenue	2,333	2,699	2,564
Gains (Losses) related to investment securities, net	67	(286)	141
Total revenue	9,594	8,953	8,640
Expenses	7,058	6,842	5,966
Income before income taxes	2,536	2,086	2,525
Income tax expense	616	530	722
Net income (loss)	1,920	1,556	(1,881)
Non- U.S. [Member]
Segment Reporting Information [Line Items]
Total fee revenue	3,004	2,661	2,291
Net interest revenue	1,104	725	422
Gains (Losses) related to investment securities, net	(25)	449	(37)
Total revenue	4,083	3,835	2,676
Expenses	3,415	2,962	2,457
Income before income taxes	668	873	219
Income tax expense	172	327	84
Net income (loss)	496	546	135
United Kingdom [Member]
Segment Reporting Information [Line Items]
Total revenue	$ 1,040	$ 1,180

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Non-U.S. Activities (Summary Of Non-U.S. Assets) (Details) (USD $) In Millions, unless otherwise specified	Dec. 31, 2011	Dec. 31, 2010	Jun. 30, 2010
Segment Reporting Information [Line Items]
Interest-bearing deposits with banks	$ 58,886	$ 22,234
Other assets	17,139	13,841	564,000
Total assets	216,827	160,505
Non-U.S. Assets [Member]
Segment Reporting Information [Line Items]
Interest-bearing deposits with banks	10,772	9,443
Non-U.S. investment securities	25,376	19,329
Other assets	15,518	13,994
Total assets	$ 51,666	$ 42,766

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Parent Company Financial Statements (Parent Company Statement Of Income) (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Total revenue	$ 9,594	$ 8,953	$ 8,640
Other Expense	459	374	516
Total expenses	7,058	6,842	5,966
Income tax benefit	616	530	722
Extraordinary loss, net of taxes			(3,684)
Net income (loss)	1,920	1,556	(1,881)
Parent Company [Member]
Cash dividends from consolidated banking subsidiary		1,400	250
Cash dividends from consolidated non-banking subsidiaries and unconsolidated entities	60	100	25
Other, net	34	9	(11)
Total revenue	94	1,509	264
Interest expense	203	162	178
Other Expense	60	421	53
Total expenses	263	583	231
Income tax benefit	(125)	(93)	(38)
Income (Loss) before equity in undistributed income of consolidated subsidiaries and unconsolidated entities	(44)	1,019	71
Extraordinary loss, net of taxes			(20)
Consolidated banking subsidiary	1,773	484	(1,987)
Consolidated non-banking subsidiaries and unconsolidated entities	191	53	55
Net income (loss)	$ 1,920	$ 1,556	$ (1,881)

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Parent Company Financial Statements (Parent Company Statement Of Condition) (Details) (USD $) In Millions, unless otherwise specified	Dec. 31, 2011	Dec. 31, 2010	Jun. 30, 2010	Dec. 31, 2009	Dec. 31, 2008
Assets
Interest-bearing deposits with consolidated banking subsidiary	$ 58,886	$ 22,234
Trading account assets	707	479
Investment securities available for sale	99,832	81,881
Other assets	17,139	13,841	564,000
Total assets	216,827	160,505
Commercial paper	2,380	2,800
Long-term debt	8,131	8,550
Total liabilities	197,429	142,718
Total shareholders' equity	19,398	17,787		14,491	12,774
Total liabilities and shareholders' equity	216,827	160,505
Parent Company [Member]
Assets
Interest-bearing deposits with consolidated banking subsidiary	4,914	5,058
Trading account assets	138	122
Investment securities available for sale	25	24
Investments in subsidiaries, Consolidated banking subsidiary	18,724	16,697
Investments in subsidiaries, Consolidated non-banking subsidiaries	2,340	2,299
Investments in subsidiaries, Unconsolidated entities	326	297
Notes and other receivables, Consolidated banking subsidiary	618
Notes and other receivables, Consolidated non-banking subsidiaries and unconsolidated entities	302	283
Other assets	994	850
Total assets	28,381	25,630
Commercial paper	2,384	2,799
Accrued taxes, expenses and other liabilities due to Consolidated banking subsidiary		561
Accrued taxes, expenses and other liabilities due to Third parties	276	161
Long-term debt	6,323	4,322
Total liabilities	8,983	7,843
Total shareholders' equity	19,398	17,787
Total liabilities and shareholders' equity	$ 28,381	$ 25,630

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Parent Company Financial Statements (Parent Company Statement Of Cash Flows) (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Net cash (used in) provided by operating activities	$ 3,374	$ 823	$ (4,231)
Net (increase) decrease in interest-bearing deposits with banking subsidiary	(36,652)	4,398	29,222
Proceeds from sales and maturities of available-for-sale securities	44,810	34,250	43,995
Net decrease in securities related to AMLF			6,111
Business acquisitions	(214)	(2,332)
Net cash (used in) provided by investing activities	(53,895)	3,192	31,632
Net decrease in short-term borrowings related to AMLF			(6,042)
Proceeds from issuance of long-term debt, net of issuance costs	1,986		4,435
Payments for long-term debt	(2,486)	(341)	(29)
Proceeds from issuance of preferred stock	500
Proceeds from public offering of common stock, net of issuance costs			2,231
Repurchase of TARP common stock warrant			(60)
Purchases of common stock	(675)
Proceeds from exercises of common stock options	40	10	34
Repurchases of common stock for employee tax withholding	(63)	(44)	(38)
Proceeds from issuances of treasury stock for common stock awards and option exercises	9
Payments for cash dividends	(295)	(20)	(168)
Net cash (used in) provided by financing activities	49,403	(3,345)	(27,941)
Net increase (decrease)	(1,118)	670	(540)
Cash and due from banks at beginning of year	3,311	2,641	3,181
Cash and due from banks at end of year	2,193	3,311	2,641
Parent Company [Member]
Net cash (used in) provided by operating activities	(571)	1,453	(24)
Net (increase) decrease in interest-bearing deposits with banking subsidiary	144	(831)	(1,457)
Proceeds from sales and maturities of available-for-sale securities		1	36
Net decrease in securities related to AMLF			3,104
Investments in non-banking subsidiaries and unconsolidated entities	(648)	(277)	(776)
Sale of investment in non-banking subsidiaries and unconsolidated entities	39	127
Business acquisitions	(51)	(141)
Net cash (used in) provided by investing activities	(516)	(1,121)	907
Net decrease in short-term borrowings related to AMLF			(3,063)
Net (decrease) increase in commercial paper	(415)	22	189
Proceeds from issuance of long-term debt, net of issuance costs	1,986		1,992
Payments for long-term debt		(300)
Proceeds from issuance of preferred stock	500
Redemption of TARP preferred stock			(2,000)
Proceeds from public offering of common stock, net of issuance costs			2,231
Repurchase of TARP common stock warrant			(60)
Purchases of common stock	(675)
Proceeds from exercises of common stock options	40	10	34
Repurchases of common stock for employee tax withholding	(63)	(44)	(38)
Proceeds from issuances of treasury stock for common stock awards and option exercises	9
Payments for cash dividends	(295)	(20)	(168)
Net cash (used in) provided by financing activities	1,087	(332)	(883)
Net increase (decrease)
Cash and due from banks at beginning of year
Cash and due from banks at end of year

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