1.0.0.3falseStatement Of Shareholders Equity And Other Comprehensive Income (Parenthetical) (USD $)In Millions, except Per Share datafalse1$falsefalseiso4217_USDStandardhttp://www.xbrl.org/2003/iso4217USDiso42170iso4217_USD_per_sharesDividehttp://www.xbrl.org/2003/iso4217USDiso4217http://www.xbrl.org/2003/instanceshares0sharesStandardhttp://www.xbrl.org/2003/instanceshares0false2$falsefalseiso4217_USDStandardhttp://www.xbrl.org/2003/iso4217USDiso42170iso4217_USD_per_sharesDividehttp://www.xbrl.org/2003/iso4217USDiso4217http://www.xbrl.org/2003/instanceshares0sharesStandardhttp://www.xbrl.org/2003/instanceshares0false3$falsefalseiso4217_USDStandardhttp://www.xbrl.org/2003/iso4217USDiso42170iso4217_USD_per_sharesDividehttp://www.xbrl.org/2003/iso4217USDiso4217http://www.xbrl.org/2003/instanceshares0sharesStandardhttp://www.xbrl.org/2003/instanceshares053us-gaap_OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodTaxus-gaaptruedebitdurationmonetaryNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalse1truetrue21580000002158falsefalse2truetrue-2866000000-2866falsefalse3truetrue-276000000-276falsefalseNo definition available.No authoritative reference available.false63stt_OtherComprehensiveIncomeUnrealizedGainLossOnFairValueHedgesOfAvailableForSaleSecuritiesTaxsttfalsedebitdurationmonetaryThe tax effect from the appreciation or loss in value of the total of fair value hedges of available-for-sale securities...falsefalsefalsefalsefalsefalsefalsefalsefalse1falsetrue8200000082falsefalse2falsetrue-116000000-116falsefalse3falsetrue-37000000-37falsefalseThe tax effect from the appreciation or loss in value of the total of fair value hedges of available-for-sale securities during the period being reported on.No authoritative reference available.false73us-gaap_OtherComprehensiveIncomeReclassificationAdjustmentForHeldToMaturityTransferredToAvailableForSaleSecuritiesTaxus-gaaptruedebitdurationmonetaryNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalse1falsetrue-237000000-237falsefalse2falsefalse00falsefalse3falsefalse00falsefalseNo definition available.No authoritative reference available.false83us-gaap_OtherComprehensiveIncomeForeignCurrencyTranslationAdjustmentTaxus-gaaptruenadurationmonetaryNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalse1falsetrue-96000000-96falsefalse2falsetrue-91000000-91falsefalse3falsetrue6200000062falsefalseNo definition available.No authoritative reference available.false93us-gaap_OtherComprehensiveIncomeUnrealizedGainLossOnDerivativesArisingDuringPeriodTaxus-gaaptruedebitdurationmonetaryNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalse1falsetrue70000007falsefalse2falsetrue-10000000-10falsefalse3falsetrue-7000000-7falsefalseNo definition available.No authoritative reference available.false103stt_RelatedTaxesOtherComprehensiveIncomeUnrealizedGainLossOnHedgesOfNetInvestmentsInNonUSSubsidiariesNetOfTaxsttfalsecreditdurationmonetaryRelated taxes, Other Comprehensive Income, Unrealized Gain (Loss) on Hedges of Net Investments in Non-US Subsidiaries, Net of...falsefalsefalsefalsefalsefalsefalsefalsefalse1falsefalse00falsefalse2falsefalse00falsefalse3falsetrue-4000000-4falsefalseRelated taxes, Other Comprehensive Income, Unrealized Gain (Loss) on Hedges of Net Investments in Non-US Subsidiaries, Net of TaxNo authoritative reference available.false113us-gaap_OtherComprehensiveIncomeMinimumPensionLiabilityNetAdjustmentTaxus-gaaptruedebitdurationmonetaryNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalse1falsetrue2300000023falsefalse2falsetrue-48000000-48falsefalse3falsetrue2800000028falsefalseNo definition available.No authoritative reference available.false123us-gaap_CommonStockDividendsPerShareDeclaredus-gaaptruenadurationdecimalNo definition available.falsefalsefalsefalsefalsefalsefalsefalsetrue1truetrue0.040.04falsefalse2truetrue0.950.95falsefalse3truetrue0.880.88falsefalseNo definition available.No authoritative reference available.false133us-gaap_TreasuryStockAcquiredAverageCostPerShareus-gaaptruenadurationdecimalNo definition available.falsefalsefalsefalsefalsefalsefalsefalsetrue1falsefalse00falsefalse2truetrue7575falsefalse3truetrue7575falsefalseNo definition available.No authoritative reference available.false143us-gaap_AdjustmentsToAdditionalPaidInCapitalTaxEffectFromShareBasedCompensationus-gaaptruecreditdurationmonetaryNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalse1truetrue-52000000-52falsefalse2truetrue5200000052falsefalse3truetrue5200000052falsefalseNo definition available.No authoritative reference available.falsefalse310falseMillionsUnKnownNoRoundingfalsetrue