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Accumulated Other Comprehensive Income - Schedule Of Accumulated Other Comprehensive (Loss) Income (Details) (USD $)
In Millions, unless otherwise specified
Mar. 31, 2015
Dec. 31, 2014
Mar. 31, 2014
Dec. 31, 2013
Stockholders' Equity Note [Abstract]        
Net unrealized gains on cash flow hedges $ 288us-gaap_AccumulatedOtherComprehensiveIncomeLossCumulativeChangesInNetGainLossFromCashFlowHedgesEffectNetOfTax $ 276us-gaap_AccumulatedOtherComprehensiveIncomeLossCumulativeChangesInNetGainLossFromCashFlowHedgesEffectNetOfTax    
Net unrealized gains (losses) on available-for-sale securities portfolio 472us-gaap_AccumulatedOtherComprehensiveIncomeLossAvailableForSaleSecuritiesAdjustmentNetOfTax 273us-gaap_AccumulatedOtherComprehensiveIncomeLossAvailableForSaleSecuritiesAdjustmentNetOfTax    
Net unrealized gains (losses) related to reclassified available-for-sale securities 35stt_NetUnrealizedLossRelatedToReclassifiedSecurities 39stt_NetUnrealizedLossRelatedToReclassifiedSecurities    
Net unrealized gains (losses) on available-for-sale securities 507stt_NetUnrealizedGainsLossesonAvailableforsaleSecurities 312stt_NetUnrealizedGainsLossesonAvailableforsaleSecurities    
Net unrealized losses on available-for-sale securities designated in fair value hedges (136)stt_NetUnrealizedLossOnAvailableForSaleSecuritiesDesignatedInFairValueHedges (121)stt_NetUnrealizedLossOnAvailableForSaleSecuritiesDesignatedInFairValueHedges    
Other-than-temporary impairment on available-for-sale securities related to factors other than credit 0stt_ExpectedLossesFromOtherThanTemporaryImpairmentOnAvailableForSaleSecurities 1stt_ExpectedLossesFromOtherThanTemporaryImpairmentOnAvailableForSaleSecurities    
Net unrealized losses on hedges of net investments in non-U.S. subsidiaries (14)stt_NetUnrealizedLossOnHedgesOfNetInvestments (14)stt_NetUnrealizedLossOnHedgesOfNetInvestments    
Other-than-temporary impairment on held-to-maturity securities related to factors other than credit (25)stt_ExpectedLossesFromOtherThanTemporaryImpairmentOnHeldToMaturitySecurities (29)stt_ExpectedLossesFromOtherThanTemporaryImpairmentOnHeldToMaturitySecurities    
Net unrealized losses on retirement plans (267)us-gaap_AccumulatedOtherComprehensiveIncomeLossDefinedBenefitPensionAndOtherPostretirementPlansNetOfTax (272)us-gaap_AccumulatedOtherComprehensiveIncomeLossDefinedBenefitPensionAndOtherPostretirementPlansNetOfTax    
Foreign currency translation (1,359)us-gaap_AccumulatedOtherComprehensiveIncomeLossForeignCurrencyTranslationAdjustmentNetOfTax (660)us-gaap_AccumulatedOtherComprehensiveIncomeLossForeignCurrencyTranslationAdjustmentNetOfTax    
Total $ (1,006)us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax $ (507)us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax $ 188us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax $ (95)us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax