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STATE STREET CORP

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2.2.0.25truefalse40701 - Disclosure - Long-Term Debt (Narrative) (Details)truefalsefalse1falsefalseUSDfalsefalse3/31/2011 USD ($) USD ($) / shares $As_Of_3_31_2011http://www.sec.gov/CIK0000093751instant2011-03-31T00:00:000001-01-01T00:00:00Unit12Standardhttp://www.xbrl.org/2003/iso4217USDiso42170Unit13Standardhttp://www.xbrl.org/2003/instancepurexbrli0Unit1Standardhttp://www.xbrl.org/2003/instancesharesxbrli0Unit15Dividehttp://www.xbrl.org/2003/iso4217USDiso4217http://www.xbrl.org/2003/instancesharesxbrli0USDUSD$2falsefalsetruefalse{us-gaap_LongtermDebtTypeAxis} : Junior Subordinated Debentures [Member] 1/1/2011 - 3/31/2011 Duration_1_1_2011_To_3_31_2011_us-gaap_LongtermDebtTypeAxis_stt_JuniorSubordinatedDebenturesMemberhttp://www.sec.gov/CIK0000093751duration2011-01-01T00:00:002011-03-31T00:00:00falsefalseJunior Subordinated Debentures [Member]us-gaap_LongtermDebtTypeAxisxbrldihttp://xbrl.org/2006/xbrldistt_JuniorSubordinatedDebenturesMemberus-gaap_LongtermDebtTypeAxisexplicitMemberUnit13Standardhttp://www.xbrl.org/2003/instancepurexbrli03falsefalsetruefalse{us-gaap_LongtermDebtTypeAxis} : 4.956% Junior Subordinated Debenture Due 2018 [Member] 1/1/2011 - 3/31/2011 Duration_1_1_2011_To_3_31_2011_us-gaap_LongtermDebtTypeAxis_stt_FourPointNineFiveSixPercentJuniorSubordinatedDebentureDue2018Memberhttp://www.sec.gov/CIK0000093751duration2011-01-01T00:00:002011-03-31T00:00:00falsefalse4.956% Junior Subordinated Debenture Due 2018 [Member]us-gaap_LongtermDebtTypeAxisxbrldihttp://xbrl.org/2006/xbrldistt_FourPointNineFiveSixPercentJuniorSubordinatedDebentureDue2018Memberus-gaap_LongtermDebtTypeAxisexplicitMemberUnit13Standardhttp://www.xbrl.org/2003/instancepurexbrli04falsefalseUSDtruefalse{us-gaap_LongtermDebtTypeAxis} : 4.956% Junior Subordinated Debenture Due 2018 [Member] 2/28/2011 USD ($) $As_Of_2_28_2011_us-gaap_LongtermDebtTypeAxis_stt_FourPointNineFiveSixPercentJuniorSubordinatedDebentureDue2018Memberhttp://www.sec.gov/CIK0000093751instant2011-02-28T00:00:000001-01-01T00:00:00falsefalse4.956% Junior Subordinated Debenture Due 2018 [Member]us-gaap_LongtermDebtTypeAxisxbrldihttp://xbrl.org/2006/xbrldistt_FourPointNineFiveSixPercentJuniorSubordinatedDebentureDue2018Memberus-gaap_LongtermDebtTypeAxisexplicitMemberUnit12Standardhttp://www.xbrl.org/2003/iso4217USDiso42170USDUSD$5falsefalsetruefalse{us-gaap_LongtermDebtTypeAxis} : 8.25% Fixed-to-Floating-Rate Subordinated Notes Due to State Street Capital Trust III in 2042 [Member] 1/1/2011 - 3/31/2011 Duration_1_1_2011_To_3_31_2011_us-gaap_LongtermDebtTypeAxis_stt_EightPointTwoFivePercentFixedToFloatingRateSubordinatedNotesDueIn2042Memberhttp://www.sec.gov/CIK0000093751duration2011-01-01T00:00:002011-03-31T00:00:00falsefalse8.25% Fixed-to-Floating-Rate Subordinated Notes Due to State Street Capital Trust III in 2042 [Member]us-gaap_LongtermDebtTypeAxisxbrldihttp://xbrl.org/2006/xbrldistt_EightPointTwoFivePercentFixedToFloatingRateSubordinatedNotesDueIn2042Memberus-gaap_LongtermDebtTypeAxisexplicitMemberUnit13Standardhttp://www.xbrl.org/2003/instancepurexbrli06falsefalseUSDtruefalse{us-gaap_LongtermDebtTypeAxis} : 2.875% Senior Notes [Member] 1/1/2011 - 3/31/2011 Duration_1_1_2011_To_3_31_2011_us-gaap_LongtermDebtTypeAxis_stt_TwoPointEightSevenFivePercentSeniorNotesMemberhttp://www.sec.gov/CIK0000093751duration2011-01-01T00:00:002011-03-31T00:00:00falsefalse2.875% Senior Notes [Member]us-gaap_LongtermDebtTypeAxisxbrldihttp://xbrl.org/2006/xbrldistt_TwoPointEightSevenFivePercentSeniorNotesMemberus-gaap_LongtermDebtTypeAxisexplicitMemberUnit12Standardhttp://www.xbrl.org/2003/iso4217USDiso42170$7falsefalseUSDtruefalse{us-gaap_LongtermDebtTypeAxis} : 4.375% Senior Notes [Member] 1/1/2011 - 3/31/2011 Duration_1_1_2011_To_3_31_2011_us-gaap_LongtermDebtTypeAxis_stt_FourPointThreeSevenFivePercentSeniorNotesMemberhttp://www.sec.gov/CIK0000093751duration2011-01-01T00:00:002011-03-31T00:00:00falsefalse4.375% Senior Notes [Member]us-gaap_LongtermDebtTypeAxisxbrldihttp://xbrl.org/2006/xbrldistt_FourPointThreeSevenFivePercentSeniorNotesMemberus-gaap_LongtermDebtTypeAxisexplicitMemberUnit12Standardhttp://www.xbrl.org/2003/iso4217USDiso42170$8falsefalseUSDtruefalse{us-gaap_LongtermDebtTypeAxis} : Floating-Rate Senior Notes [Member] 1/1/2011 - 3/31/2011 Duration_1_1_2011_To_3_31_2011_us-gaap_LongtermDebtTypeAxis_stt_FloatingRateSeniorNotesMemberhttp://www.sec.gov/CIK0000093751duration2011-01-01T00:00:002011-03-31T00:00:00falsefalseFloating-Rate Senior Notes [Member]us-gaap_LongtermDebtTypeAxisxbrldihttp://xbrl.org/2006/xbrldistt_FloatingRateSeniorNotesMemberus-gaap_LongtermDebtTypeAxisexplicitMemberUnit12Standardhttp://www.xbrl.org/2003/iso4217USDiso42170$9falsefalseUSDtruefalse{us-gaap_ScheduleOfSharesSubjectToMandatoryRedemptionBySettlementTermsAxis} : Series A Preferred Stock [Member] 3/31/2011 USD ($) $As_Of_3_31_2011_us-gaap_ScheduleOfSharesSubjectToMandatoryRedemptionBySettlementTermsAxis_us-gaap_SeriesAPreferredStockMemberhttp://www.sec.gov/CIK0000093751instant2011-03-31T00:00:000001-01-01T00:00:00falsefalseSeries A Preferred Stock [Member]us-gaap_ScheduleOfSharesSubjectToMandatoryRedemptionBySettlementTermsAxisxbrldihttp://xbrl.org/2006/xbrldius-gaap_SeriesAPreferredStockMemberus-gaap_ScheduleOfSharesSubjectToMandatoryRedemptionBySettlementTermsAxisexplicitMemberUnit12Standardhttp://www.xbrl.org/2003/iso4217USDiso42170USDUSD$10falsefalsetruefalse{us-gaap_ScheduleOfSharesSubjectToMandatoryRedemptionBySettlementTermsAxis} : State Street Capital Trust III [Member ] 1/1/2011 - 3/31/2011 Duration_1_1_2011_To_3_31_2011_us-gaap_ScheduleOfSharesSubjectToMandatoryRedemptionBySettlementTermsAxis_stt_StateStreetCapitalTrustIiiMemberhttp://www.sec.gov/CIK0000093751duration2011-01-01T00:00:002011-03-31T00:00:00falsefalseState Street Capital Trust III [Member ]us-gaap_ScheduleOfSharesSubjectToMandatoryRedemptionBySettlementTermsAxisxbrldihttp://xbrl.org/2006/xbrldistt_StateStreetCapitalTrustIiiMemberus-gaap_ScheduleOfSharesSubjectToMandatoryRedemptionBySettlementTermsAxisexplicitMemberUnit13Standardhttp://www.xbrl.org/2003/instancepurexbrli02false0us-gaap_SeniorNotesus-gaaptruecreditinstantNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalseterselabel1truefalsefalse20000000002000000000falsetruefalsefalsefalse2falsefalsefalse00falsefalsefalsetruefalse3falsefalsefalse00falsefalsefalsetruefalse4falsefalsefalse00falsefalsefalsetruefalse5falsefalsefalse00falsefalsefalsetruefalse6truefalsefalse10000000001000000000falsetruefalsetruefalse7truefalsefalse750000000750000000falsetruefalsetruefalse8truefalsefalse250000000250000000falsetruefalsetruefalse9falsefalsefalse00falsefalsefalsetruefalse10falsefalsefalse00falsefalsefalsetruefalseMonetaryxbrli:monetaryItemTypemonetaryIncluding the current and noncurrent portions, carrying value as of the balance sheet date of Notes with the highest claim on the assets of the issuer in case of bankruptcy or liquidation (with maturities initially due after one year or beyond the operating cycle if longer). Senior note holders are paid off in full before any payments are made to junior note holders.Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 16 -Article 9 falsefalse3false0us-gaap_DebtInstrumentMaturityDateus-gaaptruenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalseverboselabel1falsefalsefalse00falsefalsetruefalsefalse2falsefalsefalse00falsefalsetruetruefalse3falsefalsefalse002018-03-152018-03-15falsefalsetruetruefalse4falsefalsefalse00falsefalsetruetruefalse5falsefalsefalse00falsefalsetruetruefalse6falsefalsefalse002016-03-072016-03-07falsefalsetruetruefalse7falsefalsefalse002021-03-072021-03-07falsefalsetruetruefalse8falsefalsefalse002014-03-072014-03-07falsefalsetruetruefalse9falsefalsefalse00falsefalsetruetruefalse10falsefalsefalse00falsefalsetruetruefalseOtherxbrli:dateItemTypedateDate when the debt instrument is scheduled to be fully repaid, which may be presented in a variety of ways (year, month and year, day, month and year, quarter, etc.).Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 22 -Article 5 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 129 -Paragraph 2, 4 falsefalse4false0us-gaap_PreferredStockValueus-gaaptruecreditinstantNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalseverboselabel1truefalsefalse500000000500000000falsefalsefalsefalsefalse2falsefalsefalse00falsefalsefalsetruefalse3falsefalsefalse00falsefalsefalsetruefalse4falsefalsefalse00falsefalsefalsetruefalse5falsefalsefalse00falsefalsefalsetruefalse6falsefalsefalse00falsefalsefalsetruefalse7falsefalsefalse00falsefalsefalsetruefalse8falsefalsefalse00falsefalsefalsetruefalse9truefalsefalse500000000500000000falsefalsefalsetruefalse10falsefalsefalse00falsefalsefalsetruefalseMonetaryxbrli:monetaryItemTypemonetaryDollar value of issued nonredeemable preferred stock (or preferred stock redeemable solely at the option of the issuer) whether issued at par value, no par or stated value. This item includes treasury stock repurchased by the entity. Note: elements for number of nonredeemable preferred shares, par value and other disclosure concepts are in another section within stockholders' equity.Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 129 -Paragraph 2, 3, 4, 5, 6, 7, 8 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher AICPA -Name Accounting Principles Board Opinion (APB) -Number 12 -Paragraph 10 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 04 -Article 3 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 29 -Article 5 falsefalse5false0stt_PreferredStockLiquidationPreferencePerSharesttfalsecreditinstantThe liquidation preference (or restrictions) of nonredeemable preferred stock (or preferred stock redeemable solely at the...falsefalsefalsefalsefalsefalsefalsefalsefalsefalseterselabel1falsefalsefalse00falsefalsefalsefalsefalse2falsefalsefalse00falsefalsefalsetruefalse3falsefalsefalse00falsefalsefalsetruefalse4falsefalsefalse00falsefalsefalsetruefalse5falsefalsefalse00falsefalsefalsetruefalse6falsefalsefalse00falsefalsefalsetruefalse7falsefalsefalse00falsefalsefalsetruefalse8falsefalsefalse00falsefalsefalsetruefalse9truefalsefalse100000100000falsefalsefalsetruefalse10falsefalsefalse00falsefalsefalsetruefalseMonetaryxbrli:monetaryItemTypemonetaryThe liquidation preference (or restrictions) of nonredeemable preferred stock (or preferred stock redeemable solely at the option of the issuer) that has a preference in involuntary liquidation considerably in excess of the par or stated value of the shares. The liquidation preference is the difference between the preference in liquidation and the par or stated values of the share.No authoritative reference available.falsefalse6false0us-gaap_JuniorSubordinatedNotesus-gaaptruecreditinstantNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalseterselabel1falsefalsefalse00falsefalsefalsefalsefalse2falsefalsefalse00falsefalsefalsetruefalse3falsefalsefalse00falsefalsefalsetruefalse4truefalsefalse500000000500000000falsetruefalsetruefalse5falsefalsefalse00falsefalsefalsetruefalse6falsefalsefalse00falsefalsefalsetruefalse7falsefalsefalse00falsefalsefalsetruefalse8falsefalsefalse00falsefalsefalsetruefalse9falsefalsefalse00falsefalsefalsetruefalse10falsefalsefalse00falsefalsefalsetruefalseMonetaryxbrli:monetaryItemTypemonetaryIncluding the current and noncurrent portions, carrying value as of the balance sheet date of long-term debt (with maturities initially due after one year or beyond the operating cycle if longer) identified as Junior Subordinated Notes, which have a lower priority than senior instruments.Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 20, 22 -Article 5 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 13, 16 -Article 9 falsefalse7false0us-gaap_SubordinatedBorrowingInterestRateus-gaaptruenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalseverboselabel1falsetruefalse00falsefalsefalsefalsefalse2truetruefalse0.049560.04956falsefalsefalsetruefalse3truetruefalse0.049560.04956falsefalsefalsetruefalse4falsetruefalse00falsefalsefalsetruefalse5truetruefalse0.08250.0825falsefalsefalsetruefalse6falsetruefalse00falsefalsefalsetruefalse7falsetruefalse00falsefalsefalsetruefalse8falsetruefalse00falsefalsefalsetruefalse9falsetruefalse00falsefalsefalsetruefalse10truetruefalse0.060010.06001falsefalsefalsetruefalseOtherus-types:percentItemTypepureStated interest rate of the subordinated debt.Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher AICPA -Name Audit and Accounting Guide (AAG) -Number AAG-BRD -Chapter 4 -Paragraph 80 -Subparagraph Exhibit 4-8, 9 -IssueDate 2006-05-01 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher AICPA -Name Audit and Accounting Guide (AAG) -Number AAG-BRD -Chapter 4 -Paragraph 08 -IssueDate 2006-05-01 falsefalse8false0us-gaap_DebtConversionOriginalDebtInterestRateOfDebtus-gaaptruenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalseterselabel1falsetruefalse00falsefalsefalsefalsefalse2truetruefalse0.060010.06001falsefalsefalsetruefalse3falsetruefalse00falsefalsefalsetruefalse4falsetruefalse00falsefalsefalsetruefalse5falsetruefalse00falsefalsefalsetruefalse6falsetruefalse00falsefalsefalsetruefalse7falsetruefalse00falsefalsefalsetruefalse8falsetruefalse00falsefalsefalsetruefalse9falsetruefalse00falsefalsefalsetruefalse10falsetruefalse00falsefalsefalsetruefalseOtherus-types:percentItemTypepureThe rate of interest that was being paid on the original debt issue that is being converted in the noncash (or part noncash) transaction. "Part noncash" refers to that portion of the transaction not resulting in cash receipts or cash payments in the period.Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 95 -Paragraph 32 falsefalse107Long-Term Debt (Narrative) (Details) (USD $)NoRoundingUnKnownUnKnownUnKnowntruetrue