1.0.0.3 false Statement Of Cash Flows Indirect Deposit Based Operations (USD $) In Millions false 1 $ false false iso4217_USD Standard http://www.xbrl.org/2003/iso4217 USD iso4217 0 iso4217_USD_per_shares Divide http://www.xbrl.org/2003/iso4217 USD iso4217 http://www.xbrl.org/2003/instance shares 0 shares Standard http://www.xbrl.org/2003/instance shares 0 false 2 $ false false iso4217_USD Standard http://www.xbrl.org/2003/iso4217 USD iso4217 0 iso4217_USD_per_shares Divide http://www.xbrl.org/2003/iso4217 USD iso4217 http://www.xbrl.org/2003/instance shares 0 shares Standard http://www.xbrl.org/2003/instance shares 0 false 3 $ false false iso4217_USD Standard http://www.xbrl.org/2003/iso4217 USD iso4217 0 iso4217_USD_per_shares Divide http://www.xbrl.org/2003/iso4217 USD iso4217 http://www.xbrl.org/2003/instance shares 0 shares Standard http://www.xbrl.org/2003/instance shares 0 5 3 us-gaap_NetCashProvidedByUsedInOperatingActivitiesAbstract us-gaap true na duration string No definition available. false false false false false true false false false 1 false false 0 0 false false 2 false false 0 0 false false 3 false false 0 0 false false No definition available. false 6 4 us-gaap_NetIncomeLoss us-gaap true credit duration monetary No definition available. false false false false false false false false false 1 true true -1881000000 -1881 false false 2 true true 1811000000 1811 false false 3 true true 1261000000 1261 false false No definition available. No authoritative reference available. false 7 4 us-gaap_AdjustmentsToReconcileNetIncomeLossToCashProvidedByUsedInOperatingActivitiesAbstract us-gaap true na duration string No definition available. false false false false false true false false false 1 false false 0 0 false false 2 false false 0 0 false false 3 false false 0 0 false false No definition available. false 8 5 stt_NoncashAdjustmentsForDepreciationAmortizationAccretionAndDeferredIncomeTaxExpense stt false debit duration monetary The aggregate net amount of depreciation, amortization, and accretion recognized during the period and the component of... false false false false false false false false false 1 false true -2284000000 -2284 false false 2 false true -282000000 -282 false false 3 false true 130000000 130 false false The aggregate net amount of depreciation, amortization, and accretion recognized during the period and the component of income tax expense for the period representing the net change in deferred tax assets and liabilities associated with continuing operations. No authoritative reference available. false 9 5 us-gaap_OtherNoncashExpense us-gaap true debit duration monetary No definition available. false false false false false false false false false 1 false true 6096000000 6096 false false 2 false true 0 0 false false 3 false true 0 0 false false No definition available. No authoritative reference available. false 10 5 us-gaap_MarketableSecuritiesGainLoss us-gaap true credit duration monetary No definition available. false false false false false false false false false 1 false true -141000000 -141 false false 2 false true 54000000 54 false false 3 false true 27000000 27 false false No definition available. No authoritative reference available. false 11 5 us-gaap_IncreaseDecreaseInTradingSecurities us-gaap true credit duration monetary No definition available. false false false false false false false false false 1 false true 366000000 366 false false 2 false true -689000000 -689 false false 3 false true 195000000 195 false false No definition available. No authoritative reference available. false 12 5 us-gaap_AdjustmentsNoncashItemsToReconcileNetIncomeLossToCashProvidedByUsedInOperatingActivitiesOther us-gaap true debit duration monetary No definition available. false false false false false false false false false 1 false true -6425000000 -6425 false false 2 false true -2850000000 -2850 false false 3 false true 1326000000 1326 false false No definition available. No authoritative reference available. false 13 4 us-gaap_NetCashProvidedByUsedInOperatingActivities us-gaap true na duration monetary No definition available. false false false false false false false false false 1 false true -4269000000 -4269 false false 2 false true -1956000000 -1956 false false 3 false true 2939000000 2939 false false No definition available. No authoritative reference available. true 14 3 us-gaap_NetCashProvidedByUsedInInvestingActivitiesAbstract us-gaap true na duration string No definition available. false false false false false true false false false 1 false false 0 0 false false 2 false false 0 0 false false 3 false false 0 0 false false No definition available. false 15 4 us-gaap_ProceedsFromPaymentsForInInterestBearingDepositsInBanks us-gaap true debit duration monetary No definition available. false false false false false false false false false 1 false true 29222000000 29222 false false 2 false true -49462000000 -49462 false false 3 false true -799000000 -799 false false No definition available. No authoritative reference available. false 16 4 us-gaap_ProceedsFromPaymentsForFederalFundsSoldAndSecuritiesPurchasedUnderAgreementsToResellNet us-gaap true debit duration monetary No definition available. false false false false false false false false false 1 false true -752000000 -752 false false 2 false true 22038000000 22038 false false 3 false true -2832000000 -2832 false false No definition available. No authoritative reference available. false 17 4 us-gaap_ProceedsFromSaleOfAvailableForSaleSecurities us-gaap true debit duration monetary No definition available. false false false false false false false false false 1 false true 8274000000 8274 false false 2 false true 5408000000 5408 false false 3 false true 4731000000 4731 false false No definition available. No authoritative reference available. false 18 4 us-gaap_ProceedsFromMaturitiesPrepaymentsAndCallsOfAvailableForSaleSecurities us-gaap true debit duration monetary No definition available. false false false false false false false false false 1 false true 43995000000 43995 false false 2 false true 32291000000 32291 false false 3 false true 21750000000 21750 false false No definition available. No authoritative reference available. false 19 4 us-gaap_PaymentsToAcquireAvailableForSaleSecurities us-gaap true credit duration monetary No definition available. false false false false false false false false false 1 false true -58780000000 -58780 false false 2 false true -41044000000 -41044 false false 3 false true -27578000000 -27578 false false No definition available. No authoritative reference available. false 20 4 stt_ChangeInHeldToMaturitySecuritiesRelatedToAMLF stt false debit duration monetary Change in Held-To-maturity investment securities purchased at amortized cost under Asset-Backed Commercial Paper Money Market... false false false false false false false false false 1 false true 6111000000 6111 false false 2 false true -5818000000 -5818 false false 3 false true 0 0 false false Change in Held-To-maturity investment securities purchased at amortized cost under Asset-Backed Commercial Paper Money Market Mutual Fund Liquidity Facility instituted by the Federal Reserve Bank of Boston. No authoritative reference available. false 21 4 us-gaap_ProceedsFromMaturitiesPrepaymentsAndCallsOfHeldToMaturitySecurities us-gaap true debit duration monetary No definition available. false false false false false false false false false 1 false true 4498000000 4498 false false 2 false true 1766000000 1766 false false 3 false true 859000000 859 false false No definition available. No authoritative reference available. false 22 4 us-gaap_PaymentsToAcquireHeldToMaturitySecurities us-gaap true credit duration monetary No definition available. false false false false false false false false false 1 false true -1600000000 -1600 false false 2 false true -1062000000 -1062 false false 3 false true -539000000 -539 false false No definition available. No authoritative reference available. false 23 4 us-gaap_PaymentsForProceedsFromLoansAndLeases us-gaap true credit duration monetary No definition available. false false false false false false false false false 1 false true 800000000 800 false false 2 false true 6532000000 6532 false false 3 false true -6226000000 -6226 false false No definition available. No authoritative reference available. false 24 4 us-gaap_ProceedsFromDivestitureOfInterestInJointVenture us-gaap true debit duration monetary No definition available. false false false false false false false false false 1 false true 0 0 false false 2 false true 464000000 464 false false 3 false true 0 0 false false No definition available. No authoritative reference available. false 25 4 us-gaap_PaymentsToAcquireBusinessesNetOfCashAcquired us-gaap true credit duration monetary No definition available. false false false false false false false false false 1 false true 0 0 false false 2 false true -38000000 -38 false false 3 false true -647000000 -647 false false No definition available. No authoritative reference available. false 26 4 us-gaap_PaymentsToAcquireOtherInvestments us-gaap true credit duration monetary No definition available. false false false false false false false false false 1 false true -241000000 -241 false false 2 false true -242000000 -242 false false 3 false true -192000000 -192 false false No definition available. No authoritative reference available. false 27 4 us-gaap_PaymentsToAcquirePropertyPlantAndEquipment us-gaap true credit duration monetary No definition available. false false false false false false false false false 1 false true -325000000 -325 false false 2 false true -681000000 -681 false false 3 false true -476000000 -476 false false No definition available. No authoritative reference available. false 28 4 us-gaap_PaymentsForProceedsFromOtherInvestingActivities us-gaap true credit duration monetary No definition available. false false false false false false false false false 1 false true 430000000 430 false false 2 false true 278000000 278 false false 3 false true 95000000 95 false false No definition available. No authoritative reference available. false 29 4 us-gaap_NetCashProvidedByUsedInInvestingActivities us-gaap true debit duration monetary No definition available. false false false false false false false false false 1 false true 31632000000 31632 false false 2 false true -29570000000 -29570 false false 3 false true -11854000000 -11854 false false No definition available. No authoritative reference available. true 30 3 us-gaap_NetCashProvidedByUsedInFinancingActivitiesAbstract us-gaap true na duration string No definition available. false false false false false true false false false 1 false false 0 0 false false 2 false false 0 0 false false 3 false false 0 0 false false No definition available. false 31 4 us-gaap_IncreaseDecreaseInTimeDeposits us-gaap true debit duration monetary No definition available. false false false false false false false false false 1 false true 1267000000 1267 false false 2 false true -13988000000 -13988 false false 3 false true 4158000000 4158 false false No definition available. No authoritative reference available. false 32 4 us-gaap_IncreaseDecreaseInOtherDeposits us-gaap true debit duration monetary No definition available. false false false false false false false false false 1 false true -23408000000 -23408 false false 2 false true 30416000000 30416 false false 3 false true 14617000000 14617 false false No definition available. No authoritative reference available. false 33 4 stt_ChangeInShortTermBorrowingsRelatedToAMLF stt false debit duration monetary Change in carrying value of short-term non-recourse borrowings associated with the Asset-Backed Commercial Paper Money Market... false false false false false false false false false 1 false true -6042000000 -6042 false false 2 false true 6139000000 6139 false false 3 false true 0 0 false false Change in carrying value of short-term non-recourse borrowings associated with the Asset-Backed Commercial Paper Money Market Mutual Fund Liquidity Facility instituted by the Federal Reserve Bank of Boston. No authoritative reference available. false 34 4 us-gaap_ProceedsFromRepaymentsOfShortTermDebt us-gaap true debit duration monetary No definition available. false false false false false false false false false 1 false true -4163000000 -4163 false false 2 false true 3163000000 3163 false false 3 false true -7794000000 -7794 false false No definition available. No authoritative reference available. false 35 4 us-gaap_ProceedsFromIssuanceOfLongTermDebt us-gaap true debit duration monetary No definition available. false false false false false false false false false 1 false true 4435000000 4435 false false 2 false true 493000000 493 false false 3 false true 1488000000 1488 false false No definition available. No authoritative reference available. false 36 4 us-gaap_RepaymentsOfLongTermDebtAndCapitalSecurities us-gaap true credit duration monetary No definition available. false false false false false false false false false 1 false true -29000000 -29 false false 2 false true -44000000 -44 false false 3 false true -533000000 -533 false false No definition available. No authoritative reference available. false 37 4 us-gaap_ProceedsFromIssuanceOfCommonStock us-gaap true debit duration monetary No definition available. false false false false false false false false false 1 false true 2231000000 2231 false false 2 false true 2251000000 2251 false false 3 false true 0 0 false false No definition available. No authoritative reference available. false 38 4 us-gaap_ProceedsFromIssuanceOfPreferredStockAndPreferenceStock us-gaap true debit duration monetary No definition available. false false false false false false false false false 1 false true 0 0 false false 2 false true 1879000000 1879 false false 3 false true 0 0 false false No definition available. No authoritative reference available. false 39 4 us-gaap_ProceedsFromIssuanceOfWarrants us-gaap true debit duration monetary No definition available. false false false false false false false false false 1 false true 0 0 false false 2 false true 121000000 121 false false 3 false true 0 0 false false No definition available. No authoritative reference available. false 40 4 us-gaap_PaymentsForRepurchaseOfCommonStock us-gaap true credit duration monetary No definition available. false false false false false false false false false 1 false true 0 0 false false 2 false true 0 0 false false 3 false true -1002000000 -1002 false false No definition available. No authoritative reference available. false 41 4 us-gaap_PaymentsForRepurchaseOfPreferredStockAndPreferenceStock us-gaap true credit duration monetary No definition available. false false false false false false false false false 1 false true -2000000000 -2000 false false 2 false true 0 0 false false 3 false true 0 0 false false No definition available. No authoritative reference available. false 42 4 us-gaap_PaymentsForRepurchaseOfWarrants us-gaap true credit duration monetary No definition available. false false false false false false false false false 1 false true -60000000 -60 false false 2 false true 0 0 false false 3 false true 0 0 false false No definition available. No authoritative reference available. false 43 4 us-gaap_ProceedsFromStockOptionsExercised us-gaap true debit duration monetary No definition available. false false false false false false false false false 1 false true 34000000 34 false false 2 false true 12000000 12 false false 3 false true 0 0 false false No definition available. No authoritative reference available. false 44 4 us-gaap_ProceedsFromSaleOfTreasuryStock us-gaap true debit duration monetary No definition available. false false false false false false false false false 1 false true 0 0 false false 2 false true 623000000 623 false false 3 false true 185000000 185 false false No definition available. No authoritative reference available. false 45 4 us-gaap_PaymentsOfDividends us-gaap true credit duration monetary No definition available. false false false false false false false false false 1 false true -168000000 -168 false false 2 false true -399000000 -399 false false 3 false true -301000000 -301 false false No definition available. No authoritative reference available. false 46 4 us-gaap_NetCashProvidedByUsedInFinancingActivities us-gaap true debit duration monetary No definition available. false false false false false false false false false 1 false true -27903000000 -27903 false false 2 false true 30666000000 30666 false false 3 false true 10818000000 10818 false false No definition available. No authoritative reference available. true 47 3 us-gaap_CashAndCashEquivalentsPeriodIncreaseDecrease us-gaap true na duration monetary No definition available. false false false false false false false false false 1 false true -540000000 -540 false false 2 false true -860000000 -860 false false 3 false true 1903000000 1903 false false No definition available. No authoritative reference available. true 48 3 us-gaap_CashAndDueFromBanks us-gaap true debit instant monetary No definition available. false false false false false false true false false 1 false true 3181000000 3181 false false 2 false true 4041000000 4041 false false 3 false true 2138000000 2138 false false No definition available. No authoritative reference available. false 49 3 us-gaap_CashAndDueFromBanks us-gaap true debit instant monetary No definition available. false false false false false false false true false 1 false true 2641000000 2641 false false 2 false true 3181000000 3181 false false 3 false true 4041000000 4041 false false No definition available. No authoritative reference available. false 50 3 us-gaap_SupplementalCashFlowInformationAbstract us-gaap true na duration string No definition available. false false false false false true false false false 1 false false 0 0 false false 2 false false 0 0 false false 3 false false 0 0 false false No definition available. false 51 4 us-gaap_InterestPaid us-gaap true credit duration monetary No definition available. false false false false false false false false false 1 false true 722000000 722 false false 2 false true 2302000000 2302 false false 3 false true 3403000000 3403 false false No definition available. No authoritative reference available. false 52 4 us-gaap_IncomeTaxesPaid us-gaap true credit duration monetary No definition available. false false false false false false false false false 1 false true 884000000 884 false false 2 false true 1118000000 1118 false false 3 false true 593000000 593 false false No definition available. No authoritative reference available. false 53 4 stt_NoncashInvestment stt false credit duration monetary Noncash investment. false false false false false false false false false 1 false true 14111000000 14111 false false 2 false true 0 0 false false 3 false true 0 0 false false Noncash investment. No authoritative reference available. false 54 4 us-gaap_LoansAssumed us-gaap true debit duration monetary No definition available. false false false false false false false false false 1 false true 2510000000 2510 false false 2 false true 0 0 false false 3 false true 0 0 false false No definition available. No authoritative reference available. false 55 4 stt_NoncashInvestmentsInCapitalLeasesAndOtherPremisesAndEquipment stt false credit duration monetary Non-cash investments in capital leases and other premises and equipment false false false false false false false false false 1 false true 126000000 126 false false 2 false true 48000000 48 false false 3 false true 194000000 194 false false Non-cash investments in capital leases and other premises and equipment No authoritative reference available. false 56 4 us-gaap_LiabilitiesAssumed us-gaap true debit duration monetary No definition available. false false false false false false false false false 1 true true 20919000000 20919 false false 2 true true 0 0 false false 3 true true 0 0 false false No definition available. No authoritative reference available. false false 3 52 false Millions UnKnown UnKnown false true