2.2.0.25falsefalse10101 - Disclosure - Basis of Presentationtruefalsefalse1falsefalseUSDfalsefalse1/1/2011 - 3/31/2011 USD ($) USD ($) / shares $Duration_1_1_2011_To_3_31_2011http://www.sec.gov/CIK0000093751duration2011-01-01T00:00:002011-03-31T00:00:00Unit12Standardhttp://www.xbrl.org/2003/iso4217USDiso42170Unit15Dividehttp://www.xbrl.org/2003/iso4217USDiso4217http://www.xbrl.org/2003/instancesharesxbrli0Unit1Standardhttp://www.xbrl.org/2003/instancesharesxbrli0Unit13Standardhttp://www.xbrl.org/2003/instancepurexbrli0USDUSD$2true0stt_BasisOfPresentationAbstractsttfalsenadurationBasis of Presentation [Abstract]falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1falsefalsefalse00falsefalsefalsefalsefalseOtherxbrli:stringItemTypestringBasis of Presentation [Abstract]falsefalse3false0us-gaap_OrganizationConsolidationAndPresentationOfFinancialStatementsDisclosureTextBlockus-gaaptruenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalseterselabel1falsefalsefalse00<div> <p style="margin-top: 12px; margin-bottom: 0px;"><font style="font-family: Times New Roman;" class="_mt" size="2"><b><a name="tx165830_16"> </a>Note 1.&nbsp;&nbsp;&nbsp;&nbsp; Basis of Presentation </b></font></p> <p style="margin-top: 6px; text-indent: 32px; margin-bottom: 0px;"><font style="font-family: Times New Roman;" class="_mt" size="2">The accounting and financial reporting policies of State Street Corporation conform to U.S. generally accepted accounting principles, 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 condensed 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. </font></p> <p style="margin-top: 12px; text-indent: 32px; margin-bottom: 0px;"><font style="font-family: Times New Roman;" class="_mt" size="2">The consolidated financial statements accompanying these condensed notes are unaudited. In the opinion of management, all adjustments, consisting only of normal recurring adjustments, which are necessary for a fair statement of the consolidated results of operations in these financial statements, have been made. Certain previously reported amounts have been reclassified to conform to current period classifications as presented in this Form&nbsp;10-Q. 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-Q with the SEC. </font></p> <p style="margin-top: 12px; text-indent: 32px; margin-bottom: 0px;"><font style="font-family: Times New Roman;" class="_mt" size="2">The preparation of consolidated financial statements requires management&nbsp;to&nbsp;make estimates and assumptions in the application of certain of our accounting policies that materially affect the reported amounts of assets, liabilities, revenue and expenses. As a result of unanticipated events or circumstances, actual results could differ from those estimates. Amounts dependent on subjective or complex judgments in the application of accounting policies considered by management to be relatively more significant in this regard are those associated with our accounting for fair value measurements; interest revenue recognition and other-than-temporary impairment; and goodwill and other intangible assets. Among other effects, unanticipated events or circumstances could result in future impairment of investment securities, goodwill or other intangible assets, and the recognition of lower amounts of interest revenue from discount accretion related to certain investment securities. </font></p> <p style="margin-top: 12px; text-indent: 32px; margin-bottom: 0px;"><font style="font-family: Times New Roman;" class="_mt" size="2">Our consolidated statement of condition at December&nbsp;31, 2010 has been derived from the audited financial statements at that date, but does not include all footnotes required by GAAP for a complete set of financial statements. The accompanying consolidated financial statements and these condensed notes should be read in conjunction with the financial and risk factors information included in our 2010 Form&nbsp;10-K, which we previously filed with the SEC. </font></p> <p style="margin-top: 12px; text-indent: 32px; margin-bottom: 0px;"><font style="font-family: Times New Roman;" class="_mt" size="2">In April 2011, the FASB issued an amendment to GAAP related to the identification and disclosure of troubled debt restructurings. The amendment clarifies that the inability of a borrower to access funds at a market rate for debt with characteristics similar to the restructured debt may be an indicator of a concession being granted. The amendment also clarifies that when evaluating whether a borrower is experiencing financial difficulty, a creditor must consider whether a borrower's default is probable on any of its debt in the foreseeable future, rather than wait for an actual default to occur. The amendment is effective, for State Street, as of July&nbsp;1, 2011, and applies retroactively to restructurings occurring on or after January&nbsp;1, 2011. Adoption of the amendment is not expected to have a material effect on our consolidated financial statements. </font></p> </div>Note 1.&nbsp;&nbsp;&nbsp;&nbsp; Basis of Presentation The accounting and financial reporting policies of State Street Corporation conform to U.S. generallyfalsefalsefalsefalsefalseOtherus-types:textBlockItemTypestringDescription containing the entire organization, consolidation and basis of presentation of financial statements disclosure. May be provided in more than one note to the financial statements, as long as users are provided with an understanding of (1) the significant judgments and assumptions made by an enterprise in determining whether it must consolidate a VIE and/or disclose information about its involvement with a VIE, (2) the nature of restrictions on a consolidated VIE's assets reported by an enterprise in its statement of financial position, including the carrying amounts of such assets, (3) the nature of, and changes in, the risks associated with an enterprise's involvement with the VIE, and (4) how an enterprise's involvement with the VIE affects the enterprise's financial position, financial performance, and cash flows. Describes procedure if disclosures are provided in more than one note to the financial statements.Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name FASB Staff Position (FSP) -Number FAS140-4 and FIN46(R)-8 -Paragraph 8, C1, C7 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher AICPA -Name Accounting Research Bulletin (ARB) -Number 51 -Paragraph 2-6 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher AICPA -Name Statement of Position (SOP) -Number 94-6 -Paragraph 10 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name FASB Interpretation (FIN) -Number 46R -Paragraph 4, 14, 15 falsefalse12Basis of PresentationUnKnownUnKnownUnKnownUnKnownfalsetrue