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This item includes treasury stock repurchased by the entity. Note: elements for number of nonredeemable common shares, par value and other disclosure concepts are in another section within stockholders' 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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":"2013-01-01","end":"2013-12-31","val":0.05,"accn":"0001193125-14-088627","fy":2013,"fp":"FY","form":"10-K","filed":"2014-03-07","frame":"CY2013"},{"start":"2014-01-01","end":"2014-12-31","val":0.05,"accn":"0001193125-15-080393","fy":2014,"fp":"FY","form":"10-K","filed":"2015-03-06","frame":"CY2014"},{"start":"2015-01-01","end":"2015-12-31","val":0.05,"accn":"0001193125-16-493112","fy":2015,"fp":"FY","form":"10-K","filed":"2016-03-04","frame":"CY2015"},{"start":"2016-01-01","end":"2016-12-31","val":0.05,"accn":"0001193125-17-078703","fy":2016,"fp":"FY","form":"10-K","filed":"2017-03-10","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":0.05,"accn":"0001193125-18-075125","fy":2017,"fp":"FY","form":"10-K","filed":"2018-03-08","frame":"CY2017Q4I"},{"end":"2018-12-31","val":0.05,"accn":"0000736772-19-000009","fy":2018,"fp":"FY","form":"10-K","filed":"2019-03-07","frame":"CY2018Q4I"},{"end":"2019-12-31","val":0.05,"accn":"0000736772-20-000011","fy":2019,"fp":"FY","form":"10-K","filed":"2020-03-05","frame":"CY2019Q4I"},{"end":"2020-12-31","val":0.05,"accn":"0000736772-21-000017","fy":2020,"fp":"FY","form":"10-K","filed":"2021-03-04","frame":"CY2020Q4I"},{"end":"2021-12-31","val":0.05,"accn":"0000736772-22-000020","fy":2021,"fp":"FY","form":"10-K","filed":"2022-03-03","frame":"CY2021Q4I"},{"end":"2022-12-31","val":0.05,"accn":"0000736772-23-000023","fy":2022,"fp":"FY","form":"10-K","filed":"2023-03-03","frame":"CY2022Q4I"}]}},"DefinedBenefitPlanInterestCost":{"label":"Defined Benefit Plan, 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Excludes interim and annual periods when interim periods are reported from current statement of financial position date (rolling approach).","units":{"USD":[{"end":"2012-12-31","val":23677000,"accn":"0001193125-13-097701","fy":2012,"fp":"FY","form":"10-K","filed":"2013-03-08","frame":"CY2012Q4I"},{"end":"2013-12-31","val":13159000,"accn":"0001193125-14-088627","fy":2013,"fp":"FY","form":"10-K","filed":"2014-03-07","frame":"CY2013Q4I"},{"end":"2014-12-31","val":56235000,"accn":"0001193125-15-080393","fy":2014,"fp":"FY","form":"10-K","filed":"2015-03-06","frame":"CY2014Q4I"},{"end":"2015-12-31","val":136361000,"accn":"0001193125-16-493112","fy":2015,"fp":"FY","form":"10-K","filed":"2016-03-04","frame":"CY2015Q4I"},{"end":"2016-12-31","val":174064000,"accn":"0001193125-17-078703","fy":2016,"fp":"FY","form":"10-K","filed":"2017-03-10","frame":"CY2016Q4I"},{"end":"2017-12-31","val":62242000,"accn":"0001193125-18-075125","fy":2017,"fp":"FY","form":"10-K","filed":"2018-03-08","frame":"CY2017Q4I"},{"end":"2018-12-31","val":47562000,"accn":"0000736772-19-000009","fy":2018,"fp":"FY","form":"10-K","filed":"2019-03-07","frame":"CY2018Q4I"},{"end":"2019-12-31","val":37505000,"accn":"0000736772-20-000011","fy":2019,"fp":"FY","form":"10-K","filed":"2020-03-05","frame":"CY2019Q4I"},{"end":"2020-12-31","val":0,"accn":"0000736772-21-000017","fy":2020,"fp":"FY","form":"10-K","filed":"2021-03-04","frame":"CY2020Q4I"},{"end":"2021-06-30","val":0,"accn":"0000736772-21-000047","fy":2021,"fp":"Q2","form":"10-Q","filed":"2021-08-05","frame":"CY2021Q2I"},{"end":"2021-09-30","val":0,"accn":"0000736772-21-000062","fy":2021,"fp":"Q2","form":"10-Q","filed":"2021-11-04","frame":"CY2021Q3I"}]}},"LongTermDebtMaturitiesRepaymentsOfPrincipalInYearFive":{"label":"Long-Term Debt, Maturity, Year Five","description":"Amount of long-term debt payable, sinking fund requirement, and other securities issued that are redeemable by holder at fixed or determinable price and date, maturing in fifth fiscal year following current fiscal year. 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Excludes interim and annual periods when interim periods are reported from current statement of financial position date (rolling approach).","units":{"USD":[{"end":"2012-12-31","val":191000,"accn":"0001193125-13-097701","fy":2012,"fp":"FY","form":"10-K","filed":"2013-03-08","frame":"CY2012Q4I"},{"end":"2013-12-31","val":50237000,"accn":"0001193125-14-088627","fy":2013,"fp":"FY","form":"10-K","filed":"2014-03-07","frame":"CY2013Q4I"},{"end":"2014-12-31","val":285000,"accn":"0001193125-15-080393","fy":2014,"fp":"FY","form":"10-K","filed":"2015-03-06","frame":"CY2014Q4I"},{"end":"2015-12-31","val":4130000,"accn":"0001193125-16-493112","fy":2015,"fp":"FY","form":"10-K","filed":"2016-03-04","frame":"CY2015Q4I"},{"end":"2016-12-31","val":7505000,"accn":"0001193125-17-078703","fy":2016,"fp":"FY","form":"10-K","filed":"2017-03-10","frame":"CY2016Q4I"},{"end":"2017-12-31","val":33740000,"accn":"0001193125-18-075125","fy":2017,"fp":"FY","form":"10-K","filed":"2018-03-08","frame":"CY2017Q4I"},{"end":"2018-12-31","val":72931000,"accn":"0000736772-19-000009","fy":2018,"fp":"FY","form":"10-K","filed":"2019-03-07","frame":"CY2018Q4I"},{"end":"2019-12-31","val":51244000,"accn":"0000736772-20-000011","fy":2019,"fp":"FY","form":"10-K","filed":"2020-03-05","frame":"CY2019Q4I"},{"end":"2020-12-31","val":0,"accn":"0000736772-21-000017","fy":2020,"fp":"FY","form":"10-K","filed":"2021-03-04","frame":"CY2020Q4I"},{"end":"2021-06-30","val":0,"accn":"0000736772-21-000047","fy":2021,"fp":"Q2","form":"10-Q","filed":"2021-08-05","frame":"CY2021Q2I"},{"end":"2021-09-30","val":0,"accn":"0000736772-21-000062","fy":2021,"fp":"Q2","form":"10-Q","filed":"2021-11-04","frame":"CY2021Q3I"}]}},"LongTermDebtMaturitiesRepaymentsOfPrincipalInYearThree":{"label":"Long-Term Debt, Maturity, Year Three","description":"Amount of long-term debt payable, sinking fund requirement, and other securities issued that are redeemable by holder at fixed or determinable price and date, maturing in third fiscal year following current fiscal year. 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Excludes interim and annual periods when interim periods are reported from current statement of financial position date (rolling approach).","units":{"USD":[{"end":"2012-12-31","val":175000,"accn":"0001193125-13-097701","fy":2012,"fp":"FY","form":"10-K","filed":"2013-03-08","frame":"CY2012Q4I"},{"end":"2013-12-31","val":20218000,"accn":"0001193125-14-088627","fy":2013,"fp":"FY","form":"10-K","filed":"2014-03-07","frame":"CY2013Q4I"},{"end":"2014-12-31","val":264000,"accn":"0001193125-15-080393","fy":2014,"fp":"FY","form":"10-K","filed":"2015-03-06","frame":"CY2014Q4I"},{"end":"2015-12-31","val":70351000,"accn":"0001193125-16-493112","fy":2015,"fp":"FY","form":"10-K","filed":"2016-03-04","frame":"CY2015Q4I"},{"end":"2016-12-31","val":27826000,"accn":"0001193125-17-078703","fy":2016,"fp":"FY","form":"10-K","filed":"2017-03-10","frame":"CY2016Q4I"},{"end":"2017-12-31","val":47562000,"accn":"0001193125-18-075125","fy":2017,"fp":"FY","form":"10-K","filed":"2018-03-08","frame":"CY2017Q4I"},{"end":"2018-12-31","val":37505000,"accn":"0000736772-19-000009","fy":2018,"fp":"FY","form":"10-K","filed":"2019-03-07","frame":"CY2018Q4I"},{"end":"2019-12-31","val":33740000,"accn":"0000736772-20-000011","fy":2019,"fp":"FY","form":"10-K","filed":"2020-03-05","frame":"CY2019Q4I"},{"end":"2020-12-31","val":0,"accn":"0000736772-21-000017","fy":2020,"fp":"FY","form":"10-K","filed":"2021-03-04","frame":"CY2020Q4I"},{"end":"2021-06-30","val":0,"accn":"0000736772-21-000047","fy":2021,"fp":"Q2","form":"10-Q","filed":"2021-08-05","frame":"CY2021Q2I"},{"end":"2021-09-30","val":0,"accn":"0000736772-21-000062","fy":2021,"fp":"Q2","form":"10-Q","filed":"2021-11-04","frame":"CY2021Q3I"}]}},"LongTermDebtMaturitiesRepaymentsOfPrincipalRemainderOfFiscalYear":{"label":"Long-Term Debt, Maturity, Remainder of Fiscal Year","description":"Amount of long-term debt payable, sinking fund requirement, and other securities issued that are redeemable by holder at fixed or determinable price and date, maturing in remainder of current fiscal year.","units":{"USD":[{"end":"2021-06-30","val":0,"accn":"0000736772-21-000047","fy":2021,"fp":"Q2","form":"10-Q","filed":"2021-08-05","frame":"CY2021Q2I"},{"end":"2021-09-30","val":0,"accn":"0000736772-21-000062","fy":2021,"fp":"Q2","form":"10-Q","filed":"2021-11-04","frame":"CY2021Q3I"}]}},"LongTermDebtPercentageBearingFixedInterestRate":{"label":"Long-term Debt, Percentage Bearing Fixed Interest, Percentage Rate","description":"The interest rate applicable to the portion of the carrying amount of long-term borrowings outstanding as of the balance sheet date, including current maturities, which accrues interest at a set, unchanging rate.","units":{"pure":[{"end":"2016-09-30","val":0.0575,"accn":"0001193125-17-078703","fy":2016,"fp":"FY","form":"10-K","filed":"2017-03-10"},{"end":"2016-09-30","val":0.0575,"accn":"0001193125-18-075125","fy":2017,"fp":"FY","form":"10-K","filed":"2018-03-08","frame":"CY2016Q3I"}]}},"MinimumLeasePaymentsSaleLeasebackTransactions":{"label":"Minimum Lease Payments, Sale Leaseback Transactions","description":"Amount of minimum lease payments for sale-leaseback transactions accounted for using the deposit method or as a financing.","units":{"USD":[{"end":"2012-12-31","val":1565000,"accn":"0001193125-13-097701","fy":2012,"fp":"FY","form":"10-K","filed":"2013-03-08","frame":"CY2012Q4I"},{"end":"2013-12-31","val":1453000,"accn":"0001193125-14-088627","fy":2013,"fp":"FY","form":"10-K","filed":"2014-03-07","frame":"CY2013Q4I"},{"end":"2014-12-31","val":1341000,"accn":"0001193125-15-080393","fy":2014,"fp":"FY","form":"10-K","filed":"2015-03-06","frame":"CY2014Q4I"},{"end":"2015-12-31","val":1155000,"accn":"0001193125-16-493112","fy":2015,"fp":"FY","form":"10-K","filed":"2016-03-04","frame":"CY2015Q4I"},{"end":"2016-12-31","val":1050000,"accn":"0001193125-17-078703","fy":2016,"fp":"FY","form":"10-K","filed":"2017-03-10","frame":"CY2016Q4I"},{"end":"2017-12-31","val":945000,"accn":"0001193125-18-075125","fy":2017,"fp":"FY","form":"10-K","filed":"2018-03-08","frame":"CY2017Q4I"},{"end":"2018-12-31","val":840000,"accn":"0000736772-19-000009","fy":2018,"fp":"FY","form":"10-K","filed":"2019-03-07","frame":"CY2018Q4I"}]}},"MinimumLeasePaymentsSaleLeasebackTransactionsThereafter":{"label":"Minimum Lease Payments, Sale Leaseback Transactions, Thereafter","description":"Amount of minimum lease payments for sale-leaseback transactions accounted for using the deposit method or as a financing due after the fifth fiscal year following the latest fiscal year. 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