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available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalseterselabel1falsefalsefalse00false< ShowCurrencySymbol>falsefalsefalsefalse2falsefalsefalse00falsefalsefalsefalsefalse3falsefalsefalse00falsefalsefalsefalsefalse4truefalsefalse2600000026falsetruefalsetruefalse5truefalsefalse6000000060falsetruefalsetruefalse6falsefalsefalse00falsefalsefalsetruefalse7falsefalsefalse00falsefalsefalsetruefalseMonetaryxbrli:monetaryItemTypemonetaryThe amount for overfunded plans recognized in the balance sheet as a noncurrent asset associated with a defined benefit pension plan or other postretirement defined benefit plan.Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 132R -Paragraph 5 -Subparagraph c falsefalse3false0us-gaap_PensionAndOtherPostretirementDefinedBenefitPlansCurrentLiabilitiesus-gaaptruecreditinstantNo definition 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falsefalse4false0us-gaap_PensionAndOtherPostretirementDefinedBenefitPlansLiabilitiesNoncurrentus-gaaptruecreditinstantNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsetruenegated1falsefalsefalse00falsefalsefalsefalsefalse2falsefalsefalse00falsefalsefalsefalsefalse3falsefalsefalse00falsefalsefalsefalsefalse4truefalsefalse-45000000-45falsefalsefalsetruefalse5truefalsefalse-38000000-38falsefalsefalsetruefalse6truefalsefalse-105000000-105falsefalsefalsetruefalse7truefalsefalse-102000000-102falsefalsefalsetruefalseMonetaryxbrli:monetaryItemTypemonetaryThis represents the noncurrent liability for underfunded plans recognized in the balance sheet that is associated with the defined benefit pension plans and other postretirement defined benefit plans.Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 132R -Paragraph 5 -Subparagraph c Reference 2: 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The cost has not been recognized in net periodic benefit cost pursuant to FAS 87 and 106. A plan amendment includes provisions that grant increased benefits based on services rendered in prior periods.Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 130 -Paragraph 17, 19, 24 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 158 -Paragraph 4 -Subparagraph c, d Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 132R -Paragraph 5 -Subparagraph i Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 106 -Paragraph 52 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher AICPA -Name Accounting Research Bulletin (ARB) -Number 51 -Paragraph 38 -Subparagraph c(3) Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 158 -Paragraph 7 -Subparagraph a Reference 7: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 87 -Paragraph 25 falsefalse7false0stt_AccumulatedOtherComprehensiveIncomeNetLosssttfalsedebitdurationAccumulated Other Comprehensive Income Net Lossfalsefalsefalsefalsefalsefalsefalsefalsefalsetruenegated1false falsefalse00falsefalsefalsefalsefalse2falsefalsefalse00falsefalsefalsefalsefalse3falsefalsefalse00falsefalsefalsefalsefalse4truefalsefalse-242000000-242falsefalsefalsetruefalse5true< IsRatio>falsefalse-204000000-204falsefalsefalsetruefalse6truefalsefalse-43000000-43falsefalsefalsetruefalse7true falsefalse-49000000-49falsefalsefalsetruefalseMonetaryxbrli:monetaryItemTypemonetaryAccumulated Other Comprehensive Income Net LossNo authoritative reference available.falsefalse8false0us-gaap_AccumulatedOtherComprehensiveI ncomeLossNetOfTaxus-gaaptruecreditinstantNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalselabel1truefalsefalse-689000000-689falsefalsefalsefalsefalse2truefalsefalse-2238000000-2238falsefalsefalsefalsefalse3truefalsefalse-5650000000-5650falsefalsefalsefalsefalse4truefalsefalse-246000000-246falsefalsefalsetruefalse5truefalsefalse-208000000-208falsefalsefalsetruefalse6truefalsefalse-39000000-39falsefalsefalsetruefalse7truefalsefalse-44000000-44falsefalsefalsetruefalseMonetaryxbrli:monetaryItemTypemonetaryAccumulated change in equity from transactions and other events and circumstances from non-owner sources, net of tax effect, at fiscal year-end. 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Includes foreign currency translation items, certain pension adjustments, and unrealized gains and losses on certain investments in debt and equity securities as well as changes in the fair value of derivatives related to the effective portion of a designated cash flow hedge.Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 04 -Article 3 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher AICPA -Name Accounting Principles Board Opinion (APB) -Number 12 -Paragraph 10 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 130 -Paragraph 14, 17, 26 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 31 -Article 5 falsefalse9false0stt_CumulativeEmployerContributionsInExcessOfNetPeriodicBenefitCoststtfalsedebitdurationCumulativeEmployerContributionsInExcessOfNetPeriodicBenefitCostfalsefalsefalsefalsefalsefalsefalsefalsefalsefalseterselabel1falsefalsefalse00falsefalsefalsefalsefalse2falsefalsefalse00falsefalsefalsefalsefalse3falsefalsefalse00falsefalsefalsefalsefalse4truefalsefalse225000000225falsefalsefalsetruefalse5truefalsefalse228000000228falsefalsefalsetruefalse6truefalsefalse-75000000-75falsefalsefalsetruefalse 7truefalsefalse-68000000-68falsefalsefalsetruefalseMonetaryxbrli:monetaryItemTypemonetaryCumulativeEmployerContributionsInExcessOfNetPeriodicBenefitCostNo authoritative reference available.falsefalse10false0us-gaap_DefinedBenefitPlanAmortizationOfTransitionObligationsAssetsus-gaaptruedebitdurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalseverboselabel1falsefalsefalse00falsefalsefalsefalsefalse2falsefalsefalse00falsefalsefalsefalsefalse3falsefalsefalse00falsefalsefalsefalsefalse4truefalsefalse-21000000-21falsefalsefalsetruefalse5truefalsefalse2000000020falsefalsefalsetruefalse6truefalsefalse-114000000-114falsefalsefalsetruefalse7truefalsefalse-112000000-112falsefalsefalsetruefalseMonetaryxbrli:monetaryItemTypemonetaryThe amount of the transition obligation or asset recognized in net periodic benefit cost.Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 132R -Paragraph 5 -Subparagraph h falsefalse11false0us-gaap_DefinedBenefitPlanAccumulatedBenefitObligationus-gaaptruecreditinstantNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalseterselabel1falsefalsefalse00falsefalsefalsefalsefalse2falsefalsefalse00falsefalsefalsefalsefalse3falsefalsefalse00falsefalsefalsefalsefalse4truefalsefalse887000000887falsetruefalsetruefalse5truefalsefalse796000000796falsetruefalsetruefalse6falsefalsefalse00falsefalsefalsetruefalse< Cell>7falsefalsefalse00falsefalsefalsetruefalseMonetaryxbrli:monetaryItemTypemonetaryFor defined benefit pension plans, the actuarial present value of benefits (whether vested or nonvested) attributed by the pension benefit formula to employee service rendered before a specified date and based on employee service and compensation (if applicable) before that date. The accumulated benefit obligation differs from the proj ected benefit obligation in that it includes no assumption about future compensation levels. For plans with flat-benefit or nonpay-related pension benefit formulas, the accumulated benefit obligation and the projected benefit obligation are the same.Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 132R -Paragraph 5 -Subparagraph e falsefalse12false0us-gaap_DefinedBenefitPlanAssumptionsUsedCalculatingBenefitObligationDiscountRateus-gaaptruenainstantNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalseterselabel1falsetruefalse00falsefalsefalsefalsefalse2falsetruefalse00falsefalsefalsefalsefalse3falsetruefalse00falsefalsefalsefalsefalse4truetruefalse0.0550.055falsefalsefalsetruefalse5truetruefalse0.060.06falsefalsefalsetruefalse6truetruefalse0.0550.055falsefalsefalsetruefalse7truetruefalse0.060.06falsefalsefalsetruefalseOtherus-types:percentItemTypepureThe interest rate used to adjust for the time value of money for the plan.Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 132R -Paragraph 5 -Subparagraph j falsefalse13false0us-gaap_DefinedBenefitPlanAssumptionsUsedCalculatingBenefitObligationRateOfCompensationIncreaseus-gaaptruenainstantNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalseterselabel1falsetruefalse00falsefalsefalsefalsefalse2falsetruefalse00falsefalsefalsefalsefalse3f alsetruefalse00falsefalsefalsefalsefalse4truetruefalse0.0450.045falsefalsefalsetruefalse5tr uetruefalse0.0450.045falsefalsefalsetruefalse6falsetruefalse00falsefalsefalsetruefalse7fals etruefalse00falsefalsefalsetruefalseOtherus-types:percentItemTypepureExpected rate of compensation increases (for pay-related plans).Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 132R -Paragraph 5 -Subparagraph j falsefalse14false0stt_DefinedBenefitPlanAssumptionsUsedCalculatingBenefitCostRatesttfalsenainstantDefined Benefit Plan Assumptions Used Calculating Benefit Cost Ratefalsefalsefalsefalsefalsefalsefalsefalsefalsefalseterselabel1falsetruefalse00falsefalsefalsefalsefalse2falsetruefalse00falsefalsefalsefalsefalse 3falsetruefalse00falsefalsefalsefalsefalse4truetruefalse0.060.06falsefalsefalsetruefalse5truetruefalse0.060.06falsefalsefalsetruefalse6truetruefalse0.060.06falsefalsefalsetruefalse7truetruefalse0.060.06falsefalsefalsetruefalseOtherus-types:percentItemTypepureDefined Benefit Plan Assumptions Used Calculating Benefit Cost RateNo authoritative reference available.falsefalse15false0us-gaap_DefinedBenefitPlanAssumptionsUsedCalculatingNetPeriodicBenefitCostExpectedLongTermReturnOnAssetsus-gaaptruenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalseverboselabel1falsetruefalse00falsefalsefalsefalsefalse2falsetruefalse00falsefalsefalsefalsefalse3falsetruefalse00falsefalsefalsefalsefalse4truetruefalse0.07250.0725falsefalsefalsetruefalse5truetruefalse0.07250.0725falsefalsefalsetruefalse6falsetruefalse00falsefalsefalsetruefalse7falsetruefalse00falsefalsefalsetruefalseOtherus-types:percentItemTypepureAn assumption as to the rate of return on plan assets reflecting the average rate of earnings expected on the funds invested or to be invested to provide for the benefits included in the benefit obligation.Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 87 -Paragraph 264 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 132R -Paragraph 5 -Subparagraph j falsefalse16false0us-gaap_DefinedBenefitPlanHealthCareCostTrendRateAssumedForNextFiscalYearus-gaaptruenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalseterselabel< Id>1falsetruefalse00falsefalsefalsefalsefalse2falsetruefalse00falsefalsefalsefalsefalse3falsetruefalse00falsefalsefalsefalsefalse4falsetruefalse00falsefalsefalsetruefalse5falsetruefalse00falsefalsefalsetruefalse6truetruefalse0.07620.0762falsefalsefalsetruefalse7truetruefalse0.0840.084falsefalsefalsetruefalseOtherus-types:percentItemTypepureThe assumed health care cost trend rate for the next year used to measure the expected cost of benefits covered by the plan (gross eligible charges). This is based upon the annual rate of change in the cost of health care benefits currently provided by the postretirement benefit plan, due to factors other than changes in the composition of the plan popula tion by age and dependency status.Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 132R -Paragraph 5 -Subparagraph l falsefalse17false0us-gaap_DefinedBenefitPlanDescriptionOfDirectionAndPatternOfChangeForAssumedHealthCareCostTrendRateus-gaaptruenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalseterselabel1falsefalsefalse00falsefalsefalsefalsefalse2falsefalsefalse00falsefalsefalsefalsefalse3falsefalsefalse00falsefalsefalsefalsefalse4falsefalsefalse00--falsefalsefalsetruefalse5falsefalsefalse00--falsefalsefalsetruefalse6falsefalsefalse004.504.50falsefalsefalsetruefalse7falsefalsefalse004.504.50falsefalsefalsetruefalseOtherxbrli:stringItemTypestringA general description of the direction and pattern of change in the assumed trend rate(s) starting after one year from the current statement of financial position date.Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 132R -Paragraph 5 -Subparagraph l falsefalse18false0us-gaap_DefinedBenefitPlanYearThatRateReachesUltimateTrendRateus-gaaptruenainstantNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalseterselabel1< /Id>falsefalsefalse00falsefalsefalsefalsefalse2falsefalsefalse00falsefalsefalsefalsefalse3< IsNumeric>falsefalsefalse00falsefalsefalsefalsefalse4falsefalsefalse00falsefalsefalsetruefalse5falsefalsefalse00falsefalsefalsetruefalse6falsefalsefalse002026falsefalsefalsetruefalse 7falsefalsefalse002028falsefalsefalsetruefalseOtherxbrli:gYearItemTypepositiveintegerThe year when the ultimate health care cost trend rate is expected to be reached.Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 132R -Paragraph 5 -Subparagraph l falsefalse717Employee Benefits (Amounts recognized in the consolidated statement of condition) (Details) (USD $)MillionsUnKnownUnKnownUnKnowntruetrue