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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":"2011-12-31","val":453000000,"accn":"0000050104-12-000020","fy":2011,"fp":"FY","form":"10-K","filed":"2012-02-24","frame":"CY2011Q4I"},{"end":"2012-12-31","val":3000000,"accn":"0000050104-13-000019","fy":2012,"fp":"FY","form":"10-K","filed":"2013-02-22","frame":"CY2012Q4I"},{"end":"2013-12-31","val":456000000,"accn":"0000050104-14-000013","fy":2013,"fp":"FY","form":"10-K","filed":"2014-02-24","frame":"CY2013Q4I"},{"end":"2014-12-31","val":7000000,"accn":"0000050104-15-000007","fy":2014,"fp":"FY","form":"10-K","filed":"2015-02-24"},{"end":"2014-12-31","val":7000000,"accn":"0000050104-15-000030","fy":2015,"fp":"Q1","form":"8-K","filed":"2015-08-06","frame":"CY2014Q4I"},{"end":"2015-12-31","val":812000000,"accn":"0000050104-16-000055","fy":2015,"fp":"FY","form":"10-K","filed":"2016-02-25","frame":"CY2015Q4I"},{"end":"2016-12-31","val":488000000,"accn":"0000050104-17-000056","fy":2016,"fp":"FY","form":"10-K","filed":"2017-02-21","frame":"CY2016Q4I"},{"end":"2017-12-31","val":446000000,"accn":"0000050104-18-000054","fy":2017,"fp":"FY","form":"10-K","filed":"2018-02-21","frame":"CY2017Q4I"}]}},"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. Excludes interim and annual periods when interim periods are reported from current statement of financial position date (rolling approach).","units":{"USD":[{"end":"2011-12-31","val":53000000,"accn":"0000050104-12-000020","fy":2011,"fp":"FY","form":"10-K","filed":"2012-02-24","frame":"CY2011Q4I"},{"end":"2012-12-31","val":3000000,"accn":"0000050104-13-000019","fy":2012,"fp":"FY","form":"10-K","filed":"2013-02-22","frame":"CY2012Q4I"},{"end":"2013-12-31","val":403000000,"accn":"0000050104-14-000013","fy":2013,"fp":"FY","form":"10-K","filed":"2014-02-24","frame":"CY2013Q4I"},{"end":"2014-12-31","val":456000000,"accn":"0000050104-15-000007","fy":2014,"fp":"FY","form":"10-K","filed":"2015-02-24"},{"end":"2014-12-31","val":456000000,"accn":"0000050104-15-000030","fy":2015,"fp":"Q1","form":"8-K","filed":"2015-08-06","frame":"CY2014Q4I"},{"end":"2015-12-31","val":7000000,"accn":"0000050104-16-000055","fy":2015,"fp":"FY","form":"10-K","filed":"2016-02-25","frame":"CY2015Q4I"},{"end":"2016-12-31","val":526000000,"accn":"0000050104-17-000056","fy":2016,"fp":"FY","form":"10-K","filed":"2017-02-21","frame":"CY2016Q4I"},{"end":"2017-12-31","val":71000000,"accn":"0000050104-18-000054","fy":2017,"fp":"FY","form":"10-K","filed":"2018-02-21","frame":"CY2017Q4I"}]}},"LongTermDebtMaturitiesRepaymentsOfPrincipalInYearTwo":{"label":"Long-Term Debt, Maturity, Year Two","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 second fiscal year following current fiscal year. Excludes interim and annual periods when interim periods are reported from current statement of financial position date (rolling 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Alternate caption: Proceeds from (Payments for) Advances to 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