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authoritative reference available.falsefalse32false0stt_NetInvestmentsInConsolidatedBankingSubsidiarysttfalsedebitdurationNet investments in consolidated banking subsidiaryfalsefalsefalsefalsefalsefalsefalsefalsefalsefalselabel1falsefalsefalse00falsefalsefalsefalsefalse2falsefalsefalse00falsefalsefalsefalsefa
lse3truefalsefalse-4572000000-4572falsefalsefalsefalsefalseMonetaryxbrli:monetaryItemTypemonetaryNet investments in consolidated banking subsidiaryNo authoritative reference available.falsefalse33false0stt_InvestmentsInNonBankingSubsidiariesAndUnconsolidatedEntitiessttfalsedebitdurationInvestments in non-banking subsidiaries and unconsolidated entitiesfalsefalsefalsefalsefalsefalsefalsefalsefalsefalselabel1truefalsefalse-277000000-277falsefalsefalsefalsefalse2truefalsefalse-776000000-776falsefalsefalsefalsefalse3truefalsefalse-214
000000-214falsefalsefalsefalsefalseMonetaryxbrli:monetaryItemTypemonetaryInvestments in non-banking subsidiaries and unconsolidated entitiesNo authoritative reference available.falsefalse34false0stt_SaleOfInvestmentInNonBankingSubsidiariesAndUnconso
lidatedEntitiessttfalsedebitdurationSale Of Investment In Non-Banking Subsidiaries And Unconsolidated Entitiesfalsefalsefalsefalsefalsefalsefalsefalsefalsefalseverboselabel1truefalsefalse127000000127falsefalsefalsefalsefalse2falsefalsefalse00falsefalsefalsefalsefalse3falsefalsefalse00falsefalsefalsefalsefalseMonetaryxbrli:monetaryItemTypemonetarySale Of Investment In Non-Banking Subsidiaries And Unconsolidated EntitiesNo authoritative reference available.falsefalse35false0us-gaap_PaymentsToAcquireBusinessesNetOfCashAcquiredus-gaaptruecreditdurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalseverboselabel1truefalsefalse-141000000-141falsefalsefalsefalsefalse2falsefalsefalse00falsefalsefalsefalsefalse3falsefalsefalse00falsefalsefalsefalsefalseMonetaryxbrli:monetaryItemTypemonetaryThe cash outflow associated with the acquisition of a business, net of the cash acquired from the purchase.Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 95
-Paragraph 15, 17
falsefalse36false0stt_NetIncreaseDecreaseInNotesReceivableFromSubsidiariessttfalsedebitdurationNet increase decrease in notes receivable from subsidiariesfalsefalsefalsefalsefalsefalsefalsefalsefalsefalseverboselabel1falsefalsefalse00falsefalsefalsefalsefalse2falsefalsefalse00falsefalsefalsefalsefalse3truefalsefalse-146000000-146falsefalsefalsefalsefalseMonetaryxbrli:monetaryItemTypemonetaryNet increase decrease in notes receivable from subsidiariesNo authoritative reference available.falsefalse37false0us-gaap_PaymentsForProceedsFromOtherInvestingActivitiesus-gaaptruecreditdurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsetruenegated1falsefalsefalse00falsefalsefalsefalsefalse2falsefalsefalse00falsefalsefalsefalsefalse3truefalsefalse-21000000-21falsefalsefalsefalsefalseMonetaryxbrli:monetaryItemTypemonetaryThe net cash outflow (inflow) from other investing activities. This element is used when there is not a more specific and appropriate element in the taxonomy.Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 95
-Paragraph 15
falsefalse38false0us-gaap_NetCashProvidedByUsedInInvestingActivitiesus-gaaptruedebitdurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalsetotallabel1truefalsefalse-1121000000-1121falsefalsefalsefalsefalse2truefalsefalse907000000907falsefalsefalsefalsefalse3truefalsefalse-2102000000-2102falsefalsefalsefalsefalseMonetaryxbrli:monetaryItemTypemonetaryThe net cash inflow (outflow) from investing activity.Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 95
-Paragraph 26
truefalse39false0us-gaap_RepaymentsOfMandatoryRedeemableCapitalSecuritiesus-gaaptruecreditdurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalseterselabel1falsefalsefalse00falsefalsefalsefalsefalse2falsefalsefalse00falsefalsefalsefalsefalse3truefalsefalse-6293000000-6293falsefalsefalsefalsefalseMonetaryxbrli:monetaryItemTypemonetaryThe cash outflow to reacquire equity security that embodies an unconditional obligation requiring the issuer to redeem the securities by transferring the assets at a specified or determinable date (or dates) or upon an event that is certain to occur.Reference 1: http://www.xbrl.org/2003/role/presentationR
ef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 95
-Paragraph 18
falsefalse40false0stt_ChangeInShortTermBorrowingsRelatedToAmlfsttfalsedebitdurationChange in carrying value of short-term non-recourse borrowings associated with the Asset-Backed Commercial Paper Money Market...falsefalsefalsefalsefalsefalsefalsefalsefalsefalseterselabel1falsefalsefalse00falsefalsefalsefalsefalse2truefalsefalse-3063000000-3063falsefalsefalsefalsefalse3truefalsefalse30630000003063falsefalsefalsefalsefalseMonetaryxbrli:monetaryItemTypemonetaryChange 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.falsefalse41false0stt_NetIncreaseInCommercialPapersttfalsedebitdurationNet increase in commercial paperfalsefalsefalsefalsefalsefalsefalsefalsefalsefalselabel1truefalsefalse2200000022falsefalsefalsefalsefalse2truefalsefalse189000000189falsefalsefalsefalse
false3truefalsefalse233000000233falsefalsefalsefalsefalseMonetaryxbrli:monetaryItemTypemonetaryNet increase in commercial paperNo authoritative reference available.falsefalse42false0us-gaap_ProceedsFromIssuanceOfLongTermDebtus-gaaptruedebitdurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1falsefalsefalse00falsefalsefalsefalsefalse2truefalsefalse19920000001992falsefalsefalsefalsefalse3truefalsefalse493000000493falsefalsefalsefalsefalseMonetaryxbrli:monetaryItemTypemonetaryThe cash inflow from a debt initially having maturity due after one year or beyond the operating cycle, if longer.Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 95
-Paragraph 18
Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 95
-Paragraph 19
-Subparagraph b
falsefalse43false0us-gaap_RepaymentsOfLongTermDebtAndCapitalSecuritiesus-gaaptruecreditdurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalseterselabel1truefalsefalse-300000000-300falsefalsefalsefalsefalse2falsefalsefalse00falsefalsefalsefalsefalse3truefalsefalse-25000000-25falsefalsefalsefalsefalseMonetaryxbrli:monetaryItemTypemonetaryThe cash outflow associated with security instrument that either represents a creditor or an ownership relationship with the holder of the investment security with a maturity of beyond one year or normal operating cycle, if longer. The nature of such security interests included herein may consist of debt securities, long-term
capital lease obligations, and capital securities.Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 95
-Paragraph 18
Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 95
-Paragraph 20
-Subparagraph b
falsefalse44false0us-gaap_ProceedsFromIssuanceOfCommonStockus-gaaptruedebitdurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalseterselabel1falsefals
efalse00falsefalsefalsefalsefalse2truefalsefalse22310000002231falsefalsefalsefalsefalse3truefalsefalse22510000002251falsefalsefalsefalsefalseMonetaryxbrli:monetaryItemTypemonetaryThe cash inflow from the additional capital contribution to the entity.Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 95
-Paragraph 18
Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 95
-Paragraph 19
-Subparagraph a
falsefalse45false0stt_RepaymentOfTarpPreferredStockInvestmentsttfalsecreditdurationRepayment of TARP preferred stock investmentfalsefalsefalsefalsefalsefalsefalsefalsefalsetruenegated1falsefalsefalse00falsefalsefalsefalsefalse2truefalsefalse-2000000000-2000falsefalsefalsefalsefalse3falsefalsefalse00falsefalsefalsefalsefalseMonetaryxbrli:monetaryItemTypemonetaryRepayment of TARP preferred stock investmentNo authoritative reference available.falsefalse46false<
Level>0stt_RepurchaseOfTarpCommonStockWarrantsttfalsedebitdurationRepurchase of TARP common stock warrantfalsefalsefalsefalsefalsefalsefalsefalsefalsefalselabel1falsefalsefalse00falsefalsefalsefalsefalse2truefalsefalse-60000000-60falsefalsefalsefalsefalse3falsefalsefalse00falsefalsefalsefalsefalseMonetaryxbrli:monetaryItemTypemonetaryRepurchase of TARP common stock warrantNo authoritative reference available.falsefalse47false0stt_ProceedsFromIssuanceOfTarpPreferredStocksttfalsedebitdurationProceeds from issua
nce of TARP preferred stockfalsefalsefalsefalsefalsefalsefalsefalsefalsefalselabel1falsefalsefalse00falsefalsefalsefalsefals
e2falsefalsefalse00falsefalsefalsefalsefalse3truefalsefalse18790000001879falsefalsefalsefalsefalseMonetaryxbrli:monetaryItemTypemonetaryProceeds from issuance of TARP preferred stockNo authoritative reference available.falsefalse48false0us-gaap_ProceedsFromIssuanceOfWarrantsus-gaaptruedebitdurationNo definition available.falsefalsefalsefalsefalse
falsefalsefalsefalsefalseterselabel1falsefalsefalse00falsefalsefalsefalsefalse2falsefalsefalse00falsefalsefalsefalsefalse3truefalsefalse121000000121falsefalsefalsefalsefalseMonetaryxbrli:monetaryItemTypemonetaryThe cash inflow from issuance of rights to
purchase common shares at predetermined price (usually issued together with corporate debt).Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 95
-Paragraph 18
Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 95
-Paragraph 19
-Subparagraph a
falsefalse49false0us-gaap_ProceedsFromStockOptionsExercisedus-gaaptruedebitdurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1truefal
sefalse1000000010falsefalsefalsefalsefalse2truefalsefalse3400000034falsefalsefalsefalsefalse3truefalsefalse1200000012falsefalsefalsefalsefalseMonetaryxbrli:monetaryItemTypemonetaryThe cash inflow associated with the amount received from holders exercising their stock options.Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 95
-Paragraph 18
Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 123R
-Paragraph A240
-Subparagraph i
Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 95
-Paragraph 19
-Subparagraph a
falsefalse50false0stt_RepurchasesOfCommonStockForEmployeeTaxWithholdingsttfalsedebitdurationRepurchases Of Common Stock For Employee Tax Withholdingfalsefalsefalsefalsefalsefalsefalsefalsefalsefalseterselabel1truefalsefalse-44000000-44falsefalsefalsefalsefalse2truefalsefalse-38000000-38falsefalsefalsefalsefalse3truefalsefalse-79000000-79falsefalsefalsefalsefalseMonetaryxbrli:monetaryItemTypemonetaryRepurchases Of Common Stock For Employee Tax WithholdingNo authoritative reference available.falsefalse51false0us-gaap_ProceedsFromSaleOfTreasuryStockus-gaaptruedebitdurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalseterselabel1falsefalsefalse00falsefalsefalsefalsefalse2falsefalsefalse00falsefalsefalsefalsefalse3truefalsefalse623000000623falsefalsefalsefalsefalseMonetaryxbrli:monetaryItemTypemonetaryThe cash inflow from the issuance of an equity stock that has been previously reacquired by the entity.Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 95
-Paragraph 18
Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 95
-Paragraph 19
-Subparagraph a
falsefalse52false0us-gaap_PaymentsOfDividendsus-gaaptruecreditdurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsetruenegated1truefalsefalse-20000000-20falsefalsefalsefalsefalse2truefalsefalse-168000000-168falsefalsefalsefalsefalse3truefalsefalse-399000000-399falsefalsefalsefalsefalseMonetaryxbrli:monetaryItemTypemonetaryThe cash outflow from the entity's earnings to the shareholders.Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 95
-Paragraph 18
Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 95
-Paragraph 20
-Subparagraph a
falsefalse53false0us-gaap_NetCashProvidedByUsedInFinancingActivitiesus-gaaptruedebitdurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalsetotallabel1truefalsefalse-332000000-332falsefalsefalsefalsefalse2truefalsefalse-883000000-883falsefalsefalsefalsefalse3true
falsefalse18790000001879falsefalsefalsefalsefalseMonetaryxbrli:monetaryItemTypemonetaryThe net cash inflow (outflow) from financing activity for the period.Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 95
-Paragraph 26
truefalse54false0us-gaap_CashAndCashEquivalentsPeriodIncreaseDecreaseus-gaaptruenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalsetotallabel1falsefalsefalse00 falsefalsefalsefalsefalse2falsefalsefalse00 falsefalsefalsefalsefalse<
/hasScenarios>3falsefalsefalse00 falsefalsefalsefalsefalseMonetaryxbrli:monetaryItemTypemonetaryThe net change between the beginning and ending balance of cash and cash equivalents.Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 95
-Paragraph 26
truefalse55false0us-gaap_CashAndDueFromBanksus-gaaptruedebitinstantNo definition available.falsefalsefalsefalsefalsefalsefalsetruefalsefalseperiodstartlabel1falsefalsefalse00 falsefalsefalsefalsefalse2falsefalsefalse00 falsefalsefalsefalsefalse3falsefalsefalse00falsefalsefalsefalsefalseMonetaryxbrli:monetaryItemTypemonetaryFor banks and other depository institutions: Includes cash on hand (currency and coin), cash items in process of collection, noninterest bearing deposits due from other financial institutions (including corporate credit unions), and balances with the Federal Reserve Banks, Federal Home Loan Banks and central banks.Reference 1: http:
//www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 95
-Paragraph 8, 9
Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher AICPA
-Name Audit and Accounting Guide (AAG)
-Number AAG-DEP
-Chapter 6
-Paragraph 1, 2, 3, 7, 11
-IssueDate 2006-05-01
Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Regulation S-X (SX)
-Number 210
-Section 03
-Paragraph 1, 2, 3
-Article 9
falsefalse56false0us-gaap_CashAndDueFromBanksus-gaaptruedebitinstantNo definition available.falsefalsefalsefalsefalsefalsefalsefalsetruefalseperiodendlabel1falsefalsefalse00 falsefalsefalsefalsefalse2falsefalsefalse00 falsefalsefalsefalsefalse3falsefalsefalse00 falsefalsefalsefalsefalseMonetaryxbrli:monetaryItemTypemonetaryFor banks and other depository institutions: Includes cash on hand (currency and coin), cash items in process of collection, noninterest bearing deposits due from other financial institutions (including corporate credit unions), and balances with the Federal Reserve Banks, Federal Home Loan Banks and central bank
s.Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 95
-Paragraph 8, 9
Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher AICPA
-Name Audit and Accounting Guide (AAG)
-Number AAG-DEP
-Chapter 6
-Paragraph 1, 2, 3, 7, 11
-IssueDate 2006-05-01
Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Regulation S-X (SX)
-Number 210
-Section 03
-Paragraph 1, 2, 3
-Article 9
falsefalse355Parent Company Financial Statements (Parent Company Statement of Cash Flows) (Details) (USD $)MillionsUnKnownUnKnownUnKnownfalsetrue
