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1.0.0.3 true Statement Of Shareholders Equity And Other Comprehensive Income (USD $) In Millions, except Share data in Thousands false 1 $ true false false false PREFERRED STOCK us-gaap_StatementEquityComponentsAxis xbrldi http://xbrl.org/2006/xbrldi us-gaap_PreferredStockMember us-gaap_StatementEquityComponentsAxis explicitMember iso4217_USD Standard http://www.xbrl.org/2003/iso4217 USD iso4217 0 false 2 $ true false false false COMMON STOCK us-gaap_StatementEquityComponentsAxis xbrldi http://xbrl.org/2006/xbrldi us-gaap_CommonStockMember us-gaap_StatementEquityComponentsAxis explicitMember iso4217_USD Standard http://www.xbrl.org/2003/iso4217 USD iso4217 0 shares Standard http://www.xbrl.org/2003/instance shares 0 false 3 $ true false false false Surplus us-gaap_StatementEquityComponentsAxis xbrldi http://xbrl.org/2006/xbrldi us-gaap_AdditionalPaidInCapitalMember us-gaap_StatementEquityComponentsAxis explicitMember iso4217_USD Standard http://www.xbrl.org/2003/iso4217 USD iso4217 0 false 4 $ true false false false Retained Earnings us-gaap_StatementEquityComponentsAxis xbrldi http://xbrl.org/2006/xbrldi us-gaap_RetainedEarningsMember us-gaap_StatementEquityComponentsAxis explicitMember iso4217_USD Standard http://www.xbrl.org/2003/iso4217 USD iso4217 0 false 5 $ true false false false Accumulated Other Comprehensive (Loss) Income us-gaap_StatementEquityComponentsAxis xbrldi http://xbrl.org/2006/xbrldi us-gaap_AccumulatedOtherComprehensiveIncomeMember us-gaap_StatementEquityComponentsAxis explicitMember iso4217_USD Standard http://www.xbrl.org/2003/iso4217 USD iso4217 0 false 6 $ true false false false TREASURY STOCK us-gaap_StatementEquityComponentsAxis xbrldi http://xbrl.org/2006/xbrldi us-gaap_TreasuryStockMember us-gaap_StatementEquityComponentsAxis explicitMember iso4217_USD Standard http://www.xbrl.org/2003/iso4217 USD iso4217 0 shares Standard http://www.xbrl.org/2003/instance shares 0 false 7 $ 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 6 Beginning Balance at Dec. 31, 2006 3 us-gaap_StockholdersEquity us-gaap true credit instant monetary No definition available. false false false true false false true false false 1 true true 0 0 true false 2 true true 337000000 337 true false 3 true true 399000000 399 true false 4 true true 7030000000 7030 true false 5 true true -224000000 -224 true false 6 true true -290000000 -290 true false 7 true true 7252000000 7252 false false No definition available. No authoritative reference available. false 5 Beginning Balance (in shares) at Dec. 31, 2006 3 us-gaap_SharesIssued us-gaap true na instant shares No definition available. false false false true false false true false false 1 false false 0 0 true false 2 false true 337126000 337126 true false 3 false false 0 0 true false 4 false false 0 0 true false 5 false false 0 0 true false 6 false true 4688000 4688 true false 7 false false 0 0 false false No definition available. No authoritative reference available. false 7 Adjustment for effect of applying provisions of FASB Staff Position No. FAS 13-2 3 us-gaap_CumulativeEffectOfInitialAdoptionOfNewAccountingPrinciple us-gaap true credit duration monetary No definition available. false false false false false false false false false 1 false false 0 0 true false 2 false false 0 0 true false 3 false false 0 0 true false 4 false true -226000000 -226 true false 5 false false 0 0 true false 6 false false 0 0 true false 7 false true -226000000 -226 false false No definition available. No authoritative reference available. false 8 Adjusted balance (in shares) 3 stt_SharesBeginningBalanceRestated stt false na duration shares Aggregate stock beginning balance as restated. false false false false false false false false false 1 false false 0 0 true false 2 false true 337126000 337126 true false 3 false false 0 0 true false 4 false false 0 0 true false 5 false false 0 0 true false 6 false true 4688000 4688 true false 7 false false 0 0 false false Aggregate stock beginning balance as restated. No authoritative reference available. true 9 Adjusted balance 3 stt_StockholdersEquityBeginningBalanceRestated stt false credit duration monetary Stockholders' Equity - Beginning Balance - As Restated false false false false false false false false false 1 false true 0 0 true false 2 false true 337000000 337 true false 3 false true 399000000 399 true false 4 false true 6804000000 6804 true false 5 false true -224000000 -224 true false 6 false true -290000000 -290 true false 7 false true 7026000000 7026 false false Stockholders' Equity - Beginning Balance - As Restated No authoritative reference available. true 10 Comprehensive income: 3 us-gaap_ComprehensiveIncomeNetOfTaxAbstract us-gaap true na duration string No definition available. false false false false false true false false false 1 false false 0 0 true false 2 false false 0 0 true false 3 false false 0 0 true false 4 false false 0 0 true false 5 false false 0 0 true false 6 false false 0 0 true false 7 false false 0 0 false false No definition available. false 11 Net income (loss) 4 us-gaap_NetIncomeLoss us-gaap true credit duration monetary No definition available. false false false false false false false false false 1 false false 0 0 true false 2 false false 0 0 true false 3 false false 0 0 true false 4 false true 1261000000 1261 true false 5 false false 0 0 true false 6 false false 0 0 true false 7 false true 1261000000 1261 false false No definition available. No authoritative reference available. false 12 Change in net unrealized gains/losses on available-for-sale securities, net of reclassification adjustment and losses from other-than-temporary impairment related to factors other than credit, net of related taxes of $2,158 in 2009, $(2,866) in 2008 and $(276) in 2007 4 us-gaap_OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodNetOfTax us-gaap true credit duration monetary No definition available. false false false false false false false false false 1 false false 0 0 true false 2 false false 0 0 true false 3 false false 0 0 true false 4 false false 0 0 true false 5 false true -451000000 -451 true false 6 false false 0 0 true false 7 false true -451000000 -451 false false No definition available. No authoritative reference available. false 13 Change in net unrealized gains/losses on fair value hedges of available -for-sale securities, net of related taxes of $82 in 2009, $(116) in 2008 and $(37) in 2007 4 stt_OtherComprehensiveIncomeUnrealizedGainLossOnFairValueHedgesOfAvailableForSaleSecuritiesNetOfTax stt false credit duration monetary Appreciation or loss in value of the total of fair value hedges of available-for-sale securities during the period being... false false false false false false false false false 1 false false 0 0 true false 2 false false 0 0 true false 3 false false 0 0 true false 4 false false 0 0 true false 5 false true -55000000 -55 true false 6 false false 0 0 true false 7 false true -55000000 -55 false false Appreciation or loss in value of the total of fair value hedges of available-for-sale securities during the period being reported on, net of tax. No authoritative reference available. false 15 Foreign currency translation, net of related taxes of $(96) in 2009, $(91) in 2008 and $62 in 2007 4 us-gaap_OtherComprehensiveIncomeForeignCurrencyTransactionAndTranslationAdjustmentNetOfTaxPeriodIncreaseDecrease us-gaap true na duration monetary No definition available. false false false false false false false false false 1 false false 0 0 true false 2 false false 0 0 true false 3 false false 0 0 true false 4 false false 0 0 true false 5 false true 134000000 134 true false 6 false false 0 0 true false 7 false true 134000000 134 false false No definition available. No authoritative reference available. false 16 Change in net unrealized gains/losses on cash flow hedges, net of related taxes of $7 in 2009, $(10) in 2008 and $(7) 4 us-gaap_OtherComprehensiveIncomeUnrealizedGainLossOnDerivativesArisingDuringPeriodNetOfTax us-gaap true credit duration monetary No definition available. false false false false false false false false false 1 false false 0 0 true false 2 false false 0 0 true false 3 false false 0 0 true false 4 false false 0 0 true false 5 false true -11000000 -11 true false 6 false false 0 0 true false 7 false true -11000000 -11 false false No definition available. No authoritative reference available. false 17 Change in unrealized gains/losses on hedges of net investments in non-U.S. subsidiaries, net of related taxes 4 stt_OtherComprehensiveIncomeUnrealizedGainLossOnHedgesOfNetInvestmentsInNonUSSubsidiariesNetOfTax stt false credit duration monetary Change in accumulated gains and losses from hedges of net investments in non-US subsidiaries, net of tax effect. false false false false false false false false false 1 false false 0 0 true false 2 false false 0 0 true false 3 false false 0 0 true false 4 false false 0 0 true false 5 false true -8000000 -8 true false 6 false false 0 0 true false 7 false true -8000000 -8 false false Change in accumulated gains and losses from hedges of net investments in non-US subsidiaries, net of tax effect. No authoritative reference available. false 18 Change in minimum pension liability, net of related taxes of $23 in 2009, $(48) in 2008 and $28 in 2007 4 us-gaap_OtherComprehensiveIncomeMinimumPensionLiabilityNetAdjustmentNetOfTax us-gaap true debit duration monetary No definition available. false false false false false false false false false 1 false false 0 0 true false 2 false false 0 0 true false 3 false false 0 0 true false 4 false false 0 0 true false 5 false true 40000000 40 true false 6 false false 0 0 true false 7 false true 40000000 40 false false No definition available. No authoritative reference available. false 19 Total comprehensive income 4 us-gaap_ComprehensiveIncomeNetOfTax us-gaap true credit duration monetary No definition available. false false false false false false false false false 1 false false 0 0 true false 2 false false 0 0 true false 3 false false 0 0 true false 4 false true 1261000000 1261 true false 5 false true -351000000 -351 true false 6 false false 0 0 true false 7 false true 910000000 910 false false No definition available. No authoritative reference available. true 21 Common stock-$.04 per share in 2009, $.95 in 2008 and $.88 in 2007 3 us-gaap_DividendsCash us-gaap true debit duration monetary No definition available. false false false false false false false false false 1 false false 0 0 true false 2 false false 0 0 true false 3 false false 0 0 true false 4 false true -320000000 -320 true false 5 false false 0 0 true false 6 false false 0 0 true false 7 false true -320000000 -320 false false No definition available. No authoritative reference available. false 24 Common stock acquired ($75 in 2008 and $75 in 2007 per share) (in shares) 3 us-gaap_TreasuryStockSharesAcquired us-gaap true na duration shares No definition available. false false false false false false false false false 1 false false 0 0 true false 2 false false 0 0 true false 3 false false 0 0 true false 4 false false 0 0 true false 5 false false 0 0 true false 6 false true 13369000 13369 true false 7 false false 0 0 false false No definition available. No authoritative reference available. false 26 Common stock acquired ($75 in 2008 and $75 in 2007 per share) 3 us-gaap_TreasuryStockValueAcquiredCostMethod us-gaap true debit duration monetary No definition available. false false false false false false false false false 1 false false 0 0 true false 2 false false 0 0 true false 3 false false 0 0 true false 4 false false 0 0 true false 5 false false 0 0 true false 6 false true -1002000000 -1002 true false 7 false true -1002000000 -1002 false false No definition available. No authoritative reference available. false 32 Common stock awards and common stock options exercised, including tax benefit(expense) of $(52) in 2009, $52 in 2008 and $52 in 2007 (in shares) 3 us-gaap_StockIssuedDuringPeriodSharesStockOptionsExercised us-gaap true na duration shares No definition available. false false false false false false false false false 1 false false 0 0 true false 2 false true 401000 401 true false 3 false false 0 0 true false 4 false false 0 0 true false 5 false false 0 0 true false 6 false true -5975000 -5975 true false 7 false false 0 0 false false No definition available. No authoritative reference available. false 33 Common stock awards and common stock options exercised, including tax benefit(expense) of $(52) in 2009, $52 in 2008 and $52 in 2007 3 us-gaap_StockIssuedDuringPeriodValueStockOptionsExercised us-gaap true credit duration monetary No definition available. false false false false false false false false false 1 false false 0 0 true false 2 false false 0 0 true false 3 false true 65000000 65 true false 4 false false 0 0 true false 5 false false 0 0 true false 6 false true 393000000 393 true false 7 false true 458000000 458 false false No definition available. No authoritative reference available. false 34 Common stock issued in connection with acquisition (in shares) 3 us-gaap_StockIssuedDuringPeriodSharesAcquisitions us-gaap true na duration shares No definition available. false false false false false false false false false 1 false false 0 0 true false 2 false true 60839000 60839 true false 3 false false 0 0 true false 4 false false 0 0 true false 5 false false 0 0 true false 6 false false 0 0 true false 7 false false 0 0 false false No definition available. No authoritative reference available. false 36 Common stock issued in connection with acquisition 3 us-gaap_StockIssuedDuringPeriodValueAcquisitions us-gaap true credit duration monetary No definition available. false false false false false false false false false 1 false false 0 0 true false 2 false true 61000000 61 true false 3 false true 4166000000 4166 true false 4 false false 0 0 true false 5 false false 0 0 true false 6 false false 0 0 true false 7 false true 4227000000 4227 false false No definition available. No authoritative reference available. false 38 Ending Balance (in shares) at Dec. 31, 2007 3 us-gaap_SharesIssued us-gaap true na instant shares No definition available. false false false true false false false true false 1 false false 0 0 true false 2 false true 398366000 398366 true false 3 false false 0 0 true false 4 false false 0 0 true false 5 false false 0 0 true false 6 false true 12082000 12082 true false 7 false false 0 0 false false No definition available. No authoritative reference available. false 39 Ending Balance at Dec. 31, 2007 3 us-gaap_StockholdersEquity us-gaap true credit instant monetary No definition available. false false false true false false false true false 1 false true 0 0 true false 2 false true 398000000 398 true false 3 false true 4630000000 4630 true false 4 false true 7745000000 7745 true false 5 false true -575000000 -575 true false 6 false true -899000000 -899 true false 7 false true 11299000000 11299 false false No definition available. No authoritative reference available. false 10 Comprehensive income: 3 us-gaap_ComprehensiveIncomeNetOfTaxAbstract us-gaap true na duration string No definition available. false false false false false true false false false 1 false false 0 0 true false 2 false false 0 0 true false 3 false false 0 0 true false 4 false false 0 0 true false 5 false false 0 0 true false 6 false false 0 0 true false 7 false false 0 0 false false No definition available. false 11 Net income (loss) 4 us-gaap_NetIncomeLoss us-gaap true credit duration monetary No definition available. false false false false false false false false false 1 false false 0 0 true false 2 false false 0 0 true false 3 false false 0 0 true false 4 false true 1811000000 1811 true false 5 false false 0 0 true false 6 false false 0 0 true false 7 false true 1811000000 1811 false false No definition available. No authoritative reference available. false 12 Change in net unrealized gains/losses on available-for-sale securities, net of reclassification adjustment and losses from other-than-temporary impairment related to factors other than credit, net of related taxes of $2,158 in 2009, $(2,866) in 2008 and $(276) in 2007 4 us-gaap_OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodNetOfTax us-gaap true credit duration monetary No definition available. false false false false false false false false false 1 false false 0 0 true false 2 false false 0 0 true false 3 false false 0 0 true false 4 false false 0 0 true false 5 false true -4527000000 -4527 true false 6 false false 0 0 true false 7 false true -4527000000 -4527 false false No definition available. No authoritative reference available. false 13 Change in net unrealized gains/losses on fair value hedges of available -for-sale securities, net of related taxes of $82 in 2009, $(116) in 2008 and $(37) in 2007 4 stt_OtherComprehensiveIncomeUnrealizedGainLossOnFairValueHedgesOfAvailableForSaleSecuritiesNetOfTax stt false credit duration monetary Appreciation or loss in value of the total of fair value hedges of available-for-sale securities during the period being... false false false false false false false false false 1 false false 0 0 true false 2 false false 0 0 true false 3 false false 0 0 true false 4 false false 0 0 true false 5 false true -187000000 -187 true false 6 false false 0 0 true false 7 false true -187000000 -187 false false Appreciation or loss in value of the total of fair value hedges of available-for-sale securities during the period being reported on, net of tax. No authoritative reference available. false 15 Foreign currency translation, net of related taxes of $(96) in 2009, $(91) in 2008 and $62 in 2007 4 us-gaap_OtherComprehensiveIncomeForeignCurrencyTransactionAndTranslationAdjustmentNetOfTaxPeriodIncreaseDecrease us-gaap true na duration monetary No definition available. false false false false false false false false false 1 false false 0 0 true false 2 false false 0 0 true false 3 false false 0 0 true false 4 false false 0 0 true false 5 false true -263000000 -263 true false 6 false false 0 0 true false 7 false true -263000000 -263 false false No definition available. No authoritative reference available. false 16 Change in net unrealized gains/losses on cash flow hedges, net of related taxes of $7 in 2009, $(10) in 2008 and $(7) 4 us-gaap_OtherComprehensiveIncomeUnrealizedGainLossOnDerivativesArisingDuringPeriodNetOfTax us-gaap true credit duration monetary No definition available. false false false false false false false false false 1 false false 0 0 true false 2 false false 0 0 true false 3 false false 0 0 true false 4 false false 0 0 true false 5 false true -16000000 -16 true false 6 false false 0 0 true false 7 false true -16000000 -16 false false No definition available. No authoritative reference available. false 17 Change in unrealized gains/losses on hedges of net investments in non-U.S. subsidiaries, net of related taxes 4 stt_OtherComprehensiveIncomeUnrealizedGainLossOnHedgesOfNetInvestmentsInNonUSSubsidiariesNetOfTax stt false credit duration monetary Change in accumulated gains and losses from hedges of net investments in non-US subsidiaries, net of tax effect. false false false false false false false false false 1 false false 0 0 true false 2 false false 0 0 true false 3 false false 0 0 true false 4 false false 0 0 true false 5 false true 1000000 1 true false 6 false false 0 0 true false 7 false true 1000000 1 false false Change in accumulated gains and losses from hedges of net investments in non-US subsidiaries, net of tax effect. No authoritative reference available. false 18 Change in minimum pension liability, net of related taxes of $23 in 2009, $(48) in 2008 and $28 in 2007 4 us-gaap_OtherComprehensiveIncomeMinimumPensionLiabilityNetAdjustmentNetOfTax us-gaap true debit duration monetary No definition available. false false false false false false false false false 1 false false 0 0 true false 2 false false 0 0 true false 3 false false 0 0 true false 4 false false 0 0 true false 5 false true -83000000 -83 true false 6 false false 0 0 true false 7 false true -83000000 -83 false false No definition available. No authoritative reference available. false 19 Total comprehensive income 4 us-gaap_ComprehensiveIncomeNetOfTax us-gaap true credit duration monetary No definition available. false false false false false false false false false 1 false false 0 0 true false 2 false false 0 0 true false 3 false false 0 0 true false 4 false true 1811000000 1811 true false 5 false true -5075000000 -5075 true false 6 false false 0 0 true false 7 false true -3264000000 -3264 false false No definition available. No authoritative reference available. true 20 Preferred stock and common stock warrant issued under TARP 3 stt_StockIssuedDuringPeriodValuePreferredStockAndCommonStockWarrants stt false credit duration monetary Stock issued during period value preferred stock and common stock warrants. false false false false false false false false false 1 false true 1879000000 1879 true false 2 false false 0 0 true false 3 false true 121000000 121 true false 4 false false 0 0 true false 5 false false 0 0 true false 6 false false 0 0 true false 7 false true 2000000000 2000 false false Stock issued during period value preferred stock and common stock warrants. No authoritative reference available. false 21 Common stock-$.04 per share in 2009, $.95 in 2008 and $.88 in 2007 3 us-gaap_DividendsCash us-gaap true debit duration monetary No definition available. false false false false false false false false false 1 false false 0 0 true false 2 false false 0 0 true false 3 false false 0 0 true false 4 false true -400000000 -400 true false 5 false false 0 0 true false 6 false false 0 0 true false 7 false true -400000000 -400 false false No definition available. No authoritative reference available. false 22 Preferred stock 3 us-gaap_DividendsPreferredStock us-gaap true debit duration monetary No definition available. false false false false false false false false false 1 false false 0 0 true false 2 false false 0 0 true false 3 false false 0 0 true false 4 false true -18000000 -18 true false 5 false false 0 0 true false 6 false false 0 0 true false 7 false true -18000000 -18 false false No definition available. No authoritative reference available. false 23 Accretion of preferred stock discount 3 stt_DiscountAccretionOnPreferredStock stt false credit duration monetary Discount Accretion on Preferred Stock false false false false false false false false false 1 false true 4000000 4 true false 2 false false 0 0 true false 3 false false 0 0 true false 4 false true -4000000 -4 true false 5 false false 0 0 true false 6 false false 0 0 true false 7 false true 0 0 false false Discount Accretion on Preferred Stock No authoritative reference available. false 24 Common stock acquired ($75 in 2008 and $75 in 2007 per share) (in shares) 3 us-gaap_TreasuryStockSharesAcquired us-gaap true na duration shares No definition available. false false false false false false false false false 1 false false 0 0 true false 2 false false 0 0 true false 3 false false 0 0 true false 4 false false 0 0 true false 5 false false 0 0 true false 6 false true 552000 552 true false 7 false false 0 0 false false No definition available. No authoritative reference available. false 27 Common stock issued in public offering (in shares) 3 us-gaap_StockIssuedDuringPeriodSharesNewIssues us-gaap true na duration shares No definition available. false false false false false false false false false 1 false false 0 0 true false 2 false true 33156000 33156 true false 3 false false 0 0 true false 4 false false 0 0 true false 5 false false 0 0 true false 6 false true -7391000 -7391 true false 7 false false 0 0 false false No definition available. No authoritative reference available. false 28 Common stock issued in public offering 3 us-gaap_StockIssuedDuringPeriodValueNewIssues us-gaap true credit duration monetary No definition available. false false false false false false false false false 1 false false 0 0 true false 2 false true 34000000 34 true false 3 false true 2181000000 2181 true false 4 false false 0 0 true false 5 false false 0 0 true false 6 false true 538000000 538 true false 7 false true 2753000000 2753 false false No definition available. No authoritative reference available. false 30 Contract payments to State Street Capital Trust III 3 stt_ContractPayments stt false credit duration monetary Contract Payments false false false false false false false false false 1 false false 0 0 true false 2 false false 0 0 true false 3 false true -36000000 -36 true false 4 false false 0 0 true false 5 false false 0 0 true false 6 false false 0 0 true false 7 false true -36000000 -36 false false Contract Payments No authoritative reference available. false 32 Common stock awards and common stock options exercised, including tax benefit(expense) of $(52) in 2009, $52 in 2008 and $52 in 2007 (in shares) 3 us-gaap_StockIssuedDuringPeriodSharesStockOptionsExercised us-gaap true na duration shares No definition available. false false false false false false false false false 1 false false 0 0 true false 2 false true 454000 454 true false 3 false false 0 0 true false 4 false false 0 0 true false 5 false false 0 0 true false 6 false true -4825000 -4825 true false 7 false false 0 0 false false No definition available. No authoritative reference available. false 33 Common stock awards and common stock options exercised, including tax benefit(expense) of $(52) in 2009, $52 in 2008 and $52 in 2007 3 us-gaap_StockIssuedDuringPeriodValueStockOptionsExercised us-gaap true credit duration monetary No definition available. false false false false false false false false false 1 false false 0 0 true false 2 false false 0 0 true false 3 false true 96000000 96 true false 4 false true 1000000 1 true false 5 false false 0 0 true false 6 false true 343000000 343 true false 7 false true 440000000 440 false false No definition available. No authoritative reference available. false 38 Ending Balance (in shares) at Dec. 31, 2008 3 us-gaap_SharesIssued us-gaap true na instant shares No definition available. false false false true false false false true false 1 false false 0 0 true false 2 false true 431976000 431976 true false 3 false false 0 0 true false 4 false false 0 0 true false 5 false false 0 0 true false 6 false true 418000 418 true false 7 false false 0 0 false false No definition available. No authoritative reference available. false 39 Ending Balance at Dec. 31, 2008 3 us-gaap_StockholdersEquity us-gaap true credit instant monetary No definition available. false false false true false false false true false 1 false true 1883000000 1883 true false 2 false true 432000000 432 true false 3 false true 6992000000 6992 true false 4 false true 9135000000 9135 true false 5 false true -5650000000 -5650 true false 6 false true -18000000 -18 true false 7 false true 12774000000 12774 false false No definition available. No authoritative reference available. false 10 Comprehensive income: 3 us-gaap_ComprehensiveIncomeNetOfTaxAbstract us-gaap true na duration string No definition available. false false false false false true false false false 1 false false 0 0 true false 2 false false 0 0 true false 3 false false 0 0 true false 4 false false 0 0 true false 5 false false 0 0 true false 6 false false 0 0 true false 7 false false 0 0 false false No definition available. false 11 Net income (loss) 4 us-gaap_NetIncomeLoss us-gaap true credit duration monetary No definition available. false false false false false false false false false 1 false false 0 0 true false 2 false false 0 0 true false 3 false false 0 0 true false 4 false true -1881000000 -1881 true false 5 false false 0 0 true false 6 false false 0 0 true false 7 false true -1881000000 -1881 false false No definition available. No authoritative reference available. false 12 Change in net unrealized gains/losses on available-for-sale securities, net of reclassification adjustment and losses from other-than-temporary impairment related to factors other than credit, net of related taxes of $2,158 in 2009, $(2,866) in 2008 and $(276) in 2007 4 us-gaap_OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodNetOfTax us-gaap true credit duration monetary No definition available. false false false false false false false false false 1 false false 0 0 true false 2 false false 0 0 true false 3 false false 0 0 true false 4 false false 0 0 true false 5 false true 3410000000 3410 true false 6 false false 0 0 true false 7 false true 3410000000 3410 false false No definition available. No authoritative reference available. false 13 Change in net unrealized gains/losses on fair value hedges of available -for-sale securities, net of related taxes of $82 in 2009, $(116) in 2008 and $(37) in 2007 4 stt_OtherComprehensiveIncomeUnrealizedGainLossOnFairValueHedgesOfAvailableForSaleSecuritiesNetOfTax stt false credit duration monetary Appreciation or loss in value of the total of fair value hedges of available-for-sale securities during the period being... false false false false false false false false false 1 false false 0 0 true false 2 false false 0 0 true false 3 false false 0 0 true false 4 false false 0 0 true false 5 false true 129000000 129 true false 6 false false 0 0 true false 7 false true 129000000 129 false false Appreciation or loss in value of the total of fair value hedges of available-for-sale securities during the period being reported on, net of tax. No authoritative reference available. false 14 Losses from other-than-temporary impairment on held-to-maturity securities related to factors other than credit, net of related taxes of $(237) 4 us-gaap_OtherComprehensiveIncomeReclassificationAdjustmentForHeldToMaturityTransferredToAvailableForSaleSecuritiesNetOfTax us-gaap true debit duration monetary No definition available. false false false false false false false false false 1 false false 0 0 true false 2 false false 0 0 true false 3 false false 0 0 true false 4 false false 0 0 true false 5 false true -387000000 -387 true false 6 false false 0 0 true false 7 false true -387000000 -387 false false No definition available. No authoritative reference available. false 15 Foreign currency translation, net of related taxes of $(96) in 2009, $(91) in 2008 and $62 in 2007 4 us-gaap_OtherComprehensiveIncomeForeignCurrencyTransactionAndTranslationAdjustmentNetOfTaxPeriodIncreaseDecrease us-gaap true na duration monetary No definition available. false false false false false false false false false 1 false false 0 0 true false 2 false false 0 0 true false 3 false false 0 0 true false 4 false false 0 0 true false 5 false true 213000000 213 true false 6 false false 0 0 true false 7 false true 213000000 213 false false No definition available. No authoritative reference available. false 16 Change in net unrealized gains/losses on cash flow hedges, net of related taxes of $7 in 2009, $(10) in 2008 and $(7) 4 us-gaap_OtherComprehensiveIncomeUnrealizedGainLossOnDerivativesArisingDuringPeriodNetOfTax us-gaap true credit duration monetary No definition available. false false false false false false false false false 1 false false 0 0 true false 2 false false 0 0 true false 3 false false 0 0 true false 4 false false 0 0 true false 5 false true 10000000 10 true false 6 false false 0 0 true false 7 false true 10000000 10 false false No definition available. No authoritative reference available. false 18 Change in minimum pension liability, net of related taxes of $23 in 2009, $(48) in 2008 and $28 in 2007 4 us-gaap_OtherComprehensiveIncomeMinimumPensionLiabilityNetAdjustmentNetOfTax us-gaap true debit duration monetary No definition available. false false false false false false false false false 1 false false 0 0 true false 2 false false 0 0 true false 3 false false 0 0 true false 4 false false 0 0 true false 5 false true 37000000 37 true false 6 false false 0 0 true false 7 false true 37000000 37 false false No definition available. No authoritative reference available. false 19 Total comprehensive income 4 us-gaap_ComprehensiveIncomeNetOfTax us-gaap true credit duration monetary No definition available. false false false false false false false false false 1 false false 0 0 true false 2 false false 0 0 true false 3 false false 0 0 true false 4 false true -1881000000 -1881 true false 5 false true 3412000000 3412 true false 6 false false 0 0 true false 7 false true 1531000000 1531 false false No definition available. No authoritative reference available. true 21 Common stock-$.04 per share in 2009, $.95 in 2008 and $.88 in 2007 3 us-gaap_DividendsCash us-gaap true debit duration monetary No definition available. false false false false false false false false false 1 false false 0 0 true false 2 false false 0 0 true false 3 false false 0 0 true false 4 false true -20000000 -20 true false 5 false false 0 0 true false 6 false false 0 0 true false 7 false true -20000000 -20 false false No definition available. No authoritative reference available. false 22 Preferred stock 3 us-gaap_DividendsPreferredStock us-gaap true debit duration monetary No definition available. false false false false false false false false false 1 false false 0 0 true false 2 false false 0 0 true false 3 false false 0 0 true false 4 false true -46000000 -46 true false 5 false false 0 0 true false 6 false false 0 0 true false 7 false true -46000000 -46 false false No definition available. No authoritative reference available. false 23 Accretion of preferred stock discount 3 stt_DiscountAccretionOnPreferredStock stt false credit duration monetary Discount Accretion on Preferred Stock false false false false false false false false false 1 false true 11000000 11 true false 2 false false 0 0 true false 3 false false 0 0 true false 4 false true -11000000 -11 true false 5 false false 0 0 true false 6 false false 0 0 true false 7 false true 0 0 false false Discount Accretion on Preferred Stock No authoritative reference available. false 25 Prepayment of preferred stock discount 3 stt_PrepaymentOfDiscountOnPreferredStock stt false credit duration monetary Prepayment of discount on preferred stock. false false false false false false false false false 1 false true 106000000 106 true false 2 false false 0 0 true false 3 false false 0 0 true false 4 false true -106000000 -106 true false 5 false false 0 0 true false 6 false false 0 0 true false 7 false true 0 0 false false Prepayment of discount on preferred stock. No authoritative reference available. false 27 Common stock issued in public offering (in shares) 3 us-gaap_StockIssuedDuringPeriodSharesNewIssues us-gaap true na duration shares No definition available. false false false false false false false false false 1 false false 0 0 true false 2 false true 58974000 58974 true false 3 false false 0 0 true false 4 false false 0 0 true false 5 false false 0 0 true false 6 false false 0 0 true false 7 false false 0 0 false false No definition available. No authoritative reference available. false 28 Common stock issued in public offering 3 us-gaap_StockIssuedDuringPeriodValueNewIssues us-gaap true credit duration monetary No definition available. false false false false false false false false false 1 false false 0 0 true false 2 false true 59000000 59 true false 3 false true 2172000000 2172 true false 4 false false 0 0 true false 5 false false 0 0 true false 6 false false 0 0 true false 7 false true 2231000000 2231 false false No definition available. No authoritative reference available. false 29 Redemption of TARP preferred stock investment 3 stt_PreferredStockRepurchasedAndRetiredDuringPeriodValue stt false debit duration monetary Value of preferred stock that has been repurchased and retired during the period. The excess of the purchase price over par... false false false false false false false false false 1 false true -2000000000 -2000 true false 2 false false 0 0 true false 3 false false 0 0 true false 4 false false 0 0 true false 5 false false 0 0 true false 6 false false 0 0 true false 7 false true -2000000000 -2000 false false Value of preferred stock that has been repurchased and retired during the period. The excess of the purchase price over par value can be charged against retained earnings (once the excess is fully allocated to additional paid in capital). No authoritative reference available. false 31 Repurchase of TARP common stock warrant 3 stt_RepurchaseOfTARPCommonStockWarrant stt false debit duration monetary Value of warrant to purchase common stock that has been repurchased during the period. false false false false false false false false false 1 false false 0 0 true false 2 false false 0 0 true false 3 false true -60000000 -60 true false 4 false false 0 0 true false 5 false false 0 0 true false 6 false false 0 0 true false 7 false true -60000000 -60 false false Value of warrant to purchase common stock that has been repurchased during the period. No authoritative reference available. false 32 Common stock awards and common stock options exercised, including tax benefit(expense) of $(52) in 2009, $52 in 2008 and $52 in 2007 (in shares) 3 us-gaap_StockIssuedDuringPeriodSharesStockOptionsExercised us-gaap true na duration shares No definition available. false false false false false false false false false 1 false false 0 0 true false 2 false true 4416000 4416 true false 3 false false 0 0 true false 4 false false 0 0 true false 5 false false 0 0 true false 6 false false 0 0 true false 7 false false 0 0 false false No definition available. No authoritative reference available. false 33 Common stock awards and common stock options exercised, including tax benefit(expense) of $(52) in 2009, $52 in 2008 and $52 in 2007 3 us-gaap_StockIssuedDuringPeriodValueStockOptionsExercised us-gaap true credit duration monetary No definition available. false false false false false false false false false 1 false false 0 0 true false 2 false true 4000000 4 true false 3 false true 76000000 76 true false 4 false false 0 0 true false 5 false false 0 0 true false 6 false false 0 0 true false 7 false true 80000000 80 false false No definition available. No authoritative reference available. false 35 Other (in shares) 3 stt_OtherChangesDuringPeriodShares stt false na duration shares Number of shares of other changes in stock during the period. false false false false false false false false false 1 false false 0 0 true false 2 false false 0 0 true false 3 false false 0 0 true false 4 false false 0 0 true false 5 false false 0 0 true false 6 false true 14000 14 true false 7 false false 0 0 false false Number of shares of other changes in stock during the period. No authoritative reference available. false 37 Other 3 us-gaap_StockholdersEquityOther us-gaap true debit duration monetary No definition available. false false false false false false false false false 1 false false 0 0 true false 2 false false 0 0 true false 3 false false 0 0 true false 4 false false 0 0 true false 5 false false 0 0 true false 6 false true 1000000 1 true false 7 false true 1000000 1 false false No definition available. No authoritative reference available. false 38 Ending Balance (in shares) at Dec. 31, 2009 3 us-gaap_SharesIssued us-gaap true na instant shares No definition available. false false false true false false false true false 1 false false 0 0 true false 2 false true 495366000 495366 true false 3 false false 0 0 true false 4 false false 0 0 true false 5 false false 0 0 true false 6 false true 432000 432 true false 7 false false 0 0 false false No definition available. No authoritative reference available. false 39 Ending Balance at Dec. 31, 2009 3 us-gaap_StockholdersEquity us-gaap true credit instant monetary No definition available. false false false true false false false true false 1 true true 0 0 true false 2 true true 495000000 495 true false 3 true true 9180000000 9180 true false 4 true true 7071000000 7071 true false 5 true true -2238000000 -2238 true false 6 true true -17000000 -17 true false 7 true true 14491000000 14491 false false No definition available. No authoritative reference available. false false 7 67 false Millions Thousands UnKnown false true