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Estimated contributions may be presented in the aggregate combining (1) contributions required by funding regulations or laws, (2) discretionary contributions, and (3) noncash contributions.","units":{"USD":[{"end":"2012-03-31","val":28000000,"accn":"0000750556-12-000115","fy":2012,"fp":"Q1","form":"10-Q","filed":"2012-05-04","frame":"CY2012Q1I"},{"end":"2012-06-30","val":28000000,"accn":"0000750556-12-000152","fy":2012,"fp":"Q2","form":"10-Q","filed":"2012-08-01","frame":"CY2012Q2I"},{"end":"2012-09-30","val":28000000,"accn":"0000750556-12-000192","fy":2012,"fp":"Q3","form":"10-Q","filed":"2012-11-07","frame":"CY2012Q3I"},{"end":"2013-03-31","val":8000000,"accn":"0000750556-13-000114","fy":2013,"fp":"Q1","form":"10-Q","filed":"2013-05-07","frame":"CY2013Q1I"},{"end":"2013-06-30","val":8000000,"accn":"0000750556-13-000143","fy":2013,"fp":"Q2","form":"10-Q","filed":"2013-08-08","frame":"CY2013Q2I"}]}},"DefinedBenefitPlanFairValueOfPlanAssets":{"label":"Defined Benefit Plan, Plan Assets, Amount","description":"Amount of asset segregated and restricted to provide benefit under defined benefit plan. Asset includes, but is not limited to, stock, bond, other investment, earning from investment, and contribution by employer and employee.","units":{"USD":[{"end":"2014-12-31","val":3223000000,"accn":"0000750556-16-000251","fy":2015,"fp":"FY","form":"10-K","filed":"2016-02-23","frame":"CY2014Q4I"},{"end":"2015-12-31","val":3025000000,"accn":"0000750556-16-000251","fy":2015,"fp":"FY","form":"10-K","filed":"2016-02-23"},{"end":"2015-12-31","val":3025000000,"accn":"0000750556-17-000066","fy":2016,"fp":"FY","form":"10-K","filed":"2017-02-24","frame":"CY2015Q4I"},{"end":"2016-12-31","val":3156000000,"accn":"0000750556-17-000066","fy":2016,"fp":"FY","form":"10-K","filed":"2017-02-24"},{"end":"2016-12-31","val":3156000000,"accn":"0000750556-18-000079","fy":2017,"fp":"FY","form":"10-K","filed":"2018-02-23","frame":"CY2016Q4I"},{"end":"2017-12-31","val":3432000000,"accn":"0000750556-18-000079","fy":2017,"fp":"FY","form":"10-K","filed":"2018-02-23"},{"end":"2017-12-31","val":3432000000,"accn":"0000750556-19-000103","fy":2018,"fp":"FY","form":"10-K","filed":"2019-02-22","frame":"CY2017Q4I"},{"end":"2018-12-31","val":3017000000,"accn":"0000750556-19-000103","fy":2018,"fp":"FY","form":"10-K","filed":"2019-02-22","frame":"CY2018Q4I"}]}},"DefinedBenefitPlanFundedPercentage":{"label":"Defined Benefit Plan, Funded Percentage","description":"Percentage of plan assets to benefit obligation of defined benefit plan.","units":{"pure":[{"end":"2014-12-31","val":1.05,"accn":"0000750556-16-000251","fy":2015,"fp":"FY","form":"10-K","filed":"2016-02-23","frame":"CY2014Q4I"},{"end":"2015-12-31","val":1.06,"accn":"0000750556-16-000251","fy":2015,"fp":"FY","form":"10-K","filed":"2016-02-23"},{"end":"2015-12-31","val":1.06,"accn":"0000750556-17-000066","fy":2016,"fp":"FY","form":"10-K","filed":"2017-02-24","frame":"CY2015Q4I"},{"end":"2016-12-31","val":1.1,"accn":"0000750556-17-000066","fy":2016,"fp":"FY","form":"10-K","filed":"2017-02-24","frame":"CY2016Q4I"}]}},"DefinedBenefitPlanFundedStatusOfPlan":{"label":"Defined Benefit Plan, Funded (Unfunded) Status of Plan","description":"Amount of funded (unfunded) status of defined benefit plan, measured as difference between fair value of plan assets and benefit obligation. Includes, but is not limited to, overfunded (underfunded) status.","units":{"USD":[{"end":"2017-12-31","val":464000000,"accn":"0000750556-18-000141","fy":2018,"fp":"Q1","form":"10-Q","filed":"2018-05-04"},{"end":"2017-12-31","val":464000000,"accn":"0000750556-18-000186","fy":2018,"fp":"Q2","form":"10-Q","filed":"2018-08-03"},{"end":"2017-12-31","val":464000000,"accn":"0000750556-18-000220","fy":2018,"fp":"Q3","form":"10-Q","filed":"2018-11-02"},{"end":"2017-12-31","val":464000000,"accn":"0000750556-19-000103","fy":2018,"fp":"FY","form":"10-K","filed":"2019-02-22","frame":"CY2017Q4I"},{"end":"2018-03-31","val":476000000,"accn":"0000750556-18-000141","fy":2018,"fp":"Q1","form":"10-Q","filed":"2018-05-04","frame":"CY2018Q1I"},{"end":"2018-06-30","val":497000000,"accn":"0000750556-18-000186","fy":2018,"fp":"Q2","form":"10-Q","filed":"2018-08-03","frame":"CY2018Q2I"},{"end":"2018-09-30","val":518000000,"accn":"0000750556-18-000220","fy":2018,"fp":"Q3","form":"10-Q","filed":"2018-11-02","frame":"CY2018Q3I"},{"end":"2018-12-31","val":484000000,"accn":"0000750556-19-000103","fy":2018,"fp":"FY","form":"10-K","filed":"2019-02-22"},{"end":"2018-12-31","val":484000000,"accn":"0000750556-19-000143","fy":2019,"fp":"Q1","form":"10-Q","filed":"2019-05-06"},{"end":"2018-12-31","val":484000000,"accn":"0000750556-19-000160","fy":2019,"fp":"Q2","form":"10-Q","filed":"2019-08-02"},{"end":"2018-12-31","val":484000000,"accn":"0000750556-19-000196","fy":2019,"fp":"Q3","form":"10-Q","filed":"2019-10-31","frame":"CY2018Q4I"},{"end":"2019-03-31","val":479000000,"accn":"0000750556-19-000143","fy":2019,"fp":"Q1","form":"10-Q","filed":"2019-05-06","frame":"CY2019Q1I"},{"end":"2019-06-30","val":489000000,"accn":"0000750556-19-000160","fy":2019,"fp":"Q2","form":"10-Q","filed":"2019-08-02","frame":"CY2019Q2I"},{"end":"2019-09-30","val":499000000,"accn":"0000750556-19-000196","fy":2019,"fp":"Q3","form":"10-Q","filed":"2019-10-31","frame":"CY2019Q3I"}]}},"DefinedBenefitPlanHealthCareCostTrendRateAssumedForNextFiscalYear":{"label":"Defined Benefit Plan, Health Care Cost Trend Rate Assumed for Next Fiscal Year (Deprecated 2017-01-31)","description":"The 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 population by age and dependency status.","units":{"pure":[{"start":"2010-01-01","end":"2010-12-31","val":0.085,"accn":"0001193125-11-046750","fy":2010,"fp":"FY","form":"10-K","filed":"2011-02-25","frame":"CY2010"},{"start":"2015-01-01","end":"2015-12-31","val":0.0725,"accn":"0000750556-16-000251","fy":2015,"fp":"FY","form":"10-K","filed":"2016-02-23","frame":"CY2015"},{"start":"2016-01-01","end":"2016-12-31","val":0.07,"accn":"0000750556-17-000066","fy":2016,"fp":"FY","form":"10-K","filed":"2017-02-24","frame":"CY2016"}]}},"DefinedBenefitPlanHealthCareCostTrendRateAssumedNextFiscalYear":{"label":"Defined Benefit Plan, Health Care Cost Trend Rate Assumed, Next Fiscal Year","description":"Assumed rate, for next fiscal year, based on annual change in cost of health care cost benefits used to measure expected cost of benefits covered by defined benefit postretirement plan. Factors include, but are not limited to, estimate of health care inflation, change in health care utilization or delivery pattern, technological advances, and change in health status of participant. Excludes factors for change in composition of plan population by age and dependency status.","units":{"pure":[{"end":"2017-12-31","val":0.0825,"accn":"0000750556-18-000079","fy":2017,"fp":"FY","form":"10-K","filed":"2018-02-23","frame":"CY2017Q4I"},{"end":"2018-12-31","val":0.0725,"accn":"0000750556-19-000103","fy":2018,"fp":"FY","form":"10-K","filed":"2019-02-22","frame":"CY2018Q4I"}]}},"DefinedBenefitPlanPensionPlansWithAccumulatedBenefitObligationsInExcessOfPlanAssetsAggregateAccumulatedBenefitObligation":{"label":"Defined Benefit Plan, Plan with Accumulated Benefit Obligation in Excess of Plan Assets, Accumulated Benefit Obligation","description":"Amount of accumulated benefit obligation for defined benefit plan with accumulated benefit obligation in excess of plan assets.","units":{"USD":[{"end":"2009-12-31","val":91000000,"accn":"0001193125-11-046750","fy":2010,"fp":"FY","form":"10-K","filed":"2011-02-25","frame":"CY2009Q4I"},{"end":"2010-12-31","val":101000000,"accn":"0001193125-11-046750","fy":2010,"fp":"FY","form":"10-K","filed":"2011-02-25","frame":"CY2010Q4I"},{"end":"2012-12-31","val":2701000000,"accn":"0000750556-14-000064","fy":2013,"fp":"FY","form":"10-K","filed":"2014-02-24","frame":"CY2012Q4I"},{"end":"2013-12-31","val":79000000,"accn":"0000750556-14-000064","fy":2013,"fp":"FY","form":"10-K","filed":"2014-02-24","frame":"CY2013Q4I"}]}},"DefinedBenefitPlanPensionPlansWithAccumulatedBenefitObligationsInExcessOfPlanAssetsAggregateProjectedBenefitObligation":{"label":"Defined Benefit Plan, Pension Plan with Accumulated Benefit Obligation in Excess of Plan Assets, Projected Benefit Obligation","description":"Amount of projected benefit obligation for defined benefit pension plan with accumulated benefit obligation in excess of plan assets.","units":{"USD":[{"end":"2012-12-31","val":2701000000,"accn":"0000750556-14-000064","fy":2013,"fp":"FY","form":"10-K","filed":"2014-02-24","frame":"CY2012Q4I"},{"end":"2013-12-31","val":80000000,"accn":"0000750556-14-000064","fy":2013,"fp":"FY","form":"10-K","filed":"2014-02-24","frame":"CY2013Q4I"}]}},"DefinedBenefitPlanPlanAmendments":{"label":"Defined Benefit Plan, Benefit Obligation, Increase (Decrease) for Plan Amendment","description":"Amount of increase (decrease) in benefit obligation of defined benefit plan from change in terms of existing plan or initiation of new plan.","units":{"USD":[{"start":"2013-01-01","end":"2013-12-31","val":-76000000,"accn":"0000750556-15-000065","fy":2014,"fp":"FY","form":"10-K","filed":"2015-02-24","frame":"CY2013"}]}},"DefinedBenefitPlanRecognizedNetGainLossDueToCurtailments":{"label":"Defined Benefit Plan, Net Periodic Benefit Cost (Credit), Gain (Loss) Due to Curtailment","description":"Amount of gain (loss) recognized in net periodic benefit (cost) credit from event reducing expected years of future service of present employees or eliminating accrual of defined benefits for some or all future services of present employees.","units":{"USD":[{"start":"2010-01-01","end":"2010-12-31","val":0,"accn":"0000750556-13-000052","fy":2012,"fp":"FY","form":"10-K","filed":"2013-02-27","frame":"CY2010"},{"start":"2011-01-01","end":"2011-12-31","val":88000000,"accn":"0000750556-14-000064","fy":2013,"fp":"FY","form":"10-K","filed":"2014-02-24","frame":"CY2011"},{"start":"2011-01-01","end":"2011-12-31","val":88000000,"accn":"0000750556-13-000052","fy":2012,"fp":"FY","form":"10-K","filed":"2013-02-27"},{"start":"2012-01-01","end":"2012-12-31","val":0,"accn":"0000750556-14-000064","fy":2013,"fp":"FY","form":"10-K","filed":"2014-02-24","frame":"CY2012"},{"start":"2012-01-01","end":"2012-12-31","val":0,"accn":"0000750556-13-000052","fy":2012,"fp":"FY","form":"10-K","filed":"2013-02-27"},{"start":"2013-01-01","end":"2013-12-31","val":0,"accn":"0000750556-14-000064","fy":2013,"fp":"FY","form":"10-K","filed":"2014-02-24","frame":"CY2013"}]}},"DefinedBenefitPlanRecognizedNetGainLossDueToSettlementsAndCurtailments":{"label":"Defined Benefit Plan, Recognized Net Gain (Loss) Due to Settlements and Curtailments (Deprecated 2012-01-31)","description":"The aggregate amount of net gain (loss) recognized in net periodic benefit cost due to settlements and curtailments. Curtailments result from an event that significantly reduces the expected years of future service of present employees or eliminates for a significant number of employees the accrual of defined benefits for some or all of their future services. Settlements result from an irrevocable action that relieves the employer (or the plan) of primary responsibility for a benefit obligation and eliminates significant risks related to the obligation and the assets used to effect the settlement. Examples of transactions that constitute a settlement include (a) making lump-sum cash payments to plan participants in exchange for their rights to receive specified benefits and (b) purchasing nonparticipating annuity contracts to cover vested benefits.","units":{"USD":[{"start":"2009-01-01","end":"2009-12-31","val":0,"accn":"0000750556-12-000150","fy":2011,"fp":"FY","form":"8-K","filed":"2012-08-01","frame":"CY2009"},{"start":"2009-01-01","end":"2009-12-31","val":0,"accn":"0000750556-12-000053","fy":2011,"fp":"FY","form":"10-K","filed":"2012-02-24"},{"start":"2010-01-01","end":"2010-12-31","val":0,"accn":"0000750556-12-000150","fy":2011,"fp":"FY","form":"8-K","filed":"2012-08-01","frame":"CY2010"},{"start":"2010-01-01","end":"2010-12-31","val":0,"accn":"0000750556-12-000053","fy":2011,"fp":"FY","form":"10-K","filed":"2012-02-24"},{"start":"2011-01-01","end":"2011-12-31","val":-88000000,"accn":"0000750556-12-000150","fy":2011,"fp":"FY","form":"8-K","filed":"2012-08-01","frame":"CY2011"},{"start":"2011-01-01","end":"2011-12-31","val":-88000000,"accn":"0000750556-12-000053","fy":2011,"fp":"FY","form":"10-K","filed":"2012-02-24"}]}},"DefinedBenefitPlansEstimatedFutureEmployerContributionsInCurrentFiscalYear":{"label":"Defined 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2017-01-31)","description":"The ultimate trend rate for health care 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Real Estate and Foreclosed Assets","description":"Carrying amount as of the balance sheet date of other real estate and foreclosed assets. Other real estate may include real estate investments, real estate loans that qualify as investments in real estate, and premises that are no longer used in operations may also be included in real estate owned. Foreclosed assets include all assets obtained in full or partial satisfaction of a debt arrangement through foreclosure 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9,"fp":"Q2","form":"10-Q","filed":"2019-08-02"},{"start":"2018-01-01","end":"2018-09-30","val":260000000,"accn":"0000750556-18-000220","fy":2018,"fp":"Q3","form":"10-Q","filed":"2018-11-02"},{"start":"2018-01-01","end":"2018-09-30","val":260000000,"accn":"0000750556-19-000196","fy":2019,"fp":"Q3","form":"10-Q","filed":"2019-10-31"},{"start":"2018-01-01","end":"2018-12-31","val":352000000,"accn":"0000750556-19-000103","fy":2018,"fp":"FY","form":"10-K","filed":"2019-02-22","frame":"CY2018"},{"start":"2019-01-01","end":"2019-03-31","val":67000000,"accn":"0000750556-19-000143","fy":2019,"fp":"Q1","form":"10-Q","filed":"2019-05-06","frame":"CY2019Q1"},{"start":"2019-01-01","end":"2019-06-30","val":146000000,"accn":"0000750556-19-000160","fy":2019,"fp":"Q2","form":"10-Q","filed":"2019-08-02"},{"start":"2019-01-01","end":"2019-09-30","val":251000000,"accn":"0000750556-19-000196","fy":2019,"fp":"Q3","form":"10-Q","filed":"2019-10-31"}]}},"PaymentsToAcquireOtherInvestments":{"label":"Payments to Acquire Other Investments","description":"Amount of cash outflow to acquire investments classified as 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