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STATE STREET CORP

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2.2.0.25truefalse41103 - Disclosure - Fair Value (Level 3 Total Realized and Unrealized Gains and Losses Recorded in Revenue) (Details)truefalseIn Millionsfalse1falsefalseUSDtruefalse{us-gaap_FairValueAssetsMeasuredOnRecurringBasisDisclosureItemsAxis} : Trading Services [Member] 1/1/2011 - 3/31/2011 USD ($) $Duration_1_1_2011_To_3_31_2011_us-gaap_FairValueAssetsMeasuredOnRecurringBasisDisclosureItemsAxis_stt_TradingServicesMemberhttp://www.sec.gov/CIK0000093751duration2011-01-01T00:00:002011-03-31T00:00:00falsefalseTrading Services [Member]us-gaap_FairValueAssetsMeasuredOnRecurringBasisDisclosureItemsAxisxbrldihttp://xbrl.org/2006/xbrldistt_TradingServicesMemberus-gaap_FairValueAssetsMeasuredOnRecurringBasisDisclosureItemsAxisexplicitMemberUnit12Standardhttp://www.xbrl.org/2003/iso4217USDiso42170USDUSD$2falsefalseUSDtruefalse{us-gaap_FairValueAssetsMeasuredOnRecurringBasisDisclosureItemsAxis} : Trading Services [Member] 1/1/2010 - 3/31/2010 USD ($) $Duration_1_1_2010_To_3_31_2010_us-gaap_FairValueAssetsMeasuredOnRecurringBasisDisclosureItemsAxis_stt_TradingServicesMemberhttp://www.sec.gov/CIK0000093751duration2010-01-01T00:00:002010-03-31T00:00:00falsefalseTrading Services [Member]us-gaap_FairValueAssetsMeasuredOnRecurringBasisDisclosureItemsAxisxbrldihttp://xbrl.org/2006/xbrldistt_TradingServicesMemberus-gaap_FairValueAssetsMeasuredOnRecurringBasisDisclosureItemsAxisexplicitMemberUnit12Standardhttp://www.xbrl.org/2003/iso4217USDiso42170USDUSD$1false0natruenanaNo definition available.falsetruefalsefalsefalsefalsefalsefalsefalsefalsehttp://www.statestreet.com/taxonomy/role/disclosurefairvaluelevel3totalrealizedandunrealizedgainsandlossesrecordedinrevenuedetails1falsefalsefalse00falsefalsefalsefalsefalse2falsefalsefalse00falsefalsefalsefalsefalse1falsefalseUSDtruefalse{us-gaap_FairValueAssetsMeasuredOnRecurringBasisDisclosureItemsAxis} : Trading Services [Member] 1/1/2011 - 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