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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":1177000000,"accn":"0001193125-12-082165","fy":2011,"fp":"FY","form":"10-K","filed":"2012-02-28","frame":"CY2011Q4I"},{"end":"2012-12-31","val":1151000000,"accn":"0001193125-13-077847","fy":2012,"fp":"FY","form":"10-K","filed":"2013-02-27","frame":"CY2012Q4I"},{"end":"2013-12-31","val":1176000,"accn":"0000941138-14-000045","fy":2013,"fp":"FY","form":"10-K","filed":"2014-02-25","frame":"CY2013Q4I"}]}},"LongTermDebtMaturitiesRepaymentsOfPrincipalInNextTwelveMonths":{"label":"Long-Term Debt, Maturity, Year One","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 next 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":118000000,"accn":"0001193125-12-082165","fy":2011,"fp":"FY","form":"10-K","filed":"2012-02-28","frame":"CY2011Q4I"},{"end":"2012-12-31","val":121000000,"accn":"0001193125-13-077847","fy":2012,"fp":"FY","form":"10-K","filed":"2013-02-27","frame":"CY2012Q4I"},{"end":"2013-12-31","val":214000,"accn":"0000941138-14-000045","fy":2013,"fp":"FY","form":"10-K","filed":"2014-02-25","frame":"CY2013Q4I"}]}},"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. 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":253000000,"accn":"0001193125-12-082165","fy":2011,"fp":"FY","form":"10-K","filed":"2012-02-28","frame":"CY2011Q4I"},{"end":"2012-12-31","val":18000000,"accn":"0001193125-13-077847","fy":2012,"fp":"FY","form":"10-K","filed":"2013-02-27","frame":"CY2012Q4I"},{"end":"2013-12-31","val":111000,"accn":"0000941138-14-000045","fy":2013,"fp":"FY","form":"10-K","filed":"2014-02-25","frame":"CY2013Q4I"}]}},"LongTermDebtMaturitiesRepaymentsOfPrincipalInYearFour":{"label":"Long-Term Debt, Maturity, Year Four","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 fourth 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":153000000,"accn":"0001193125-12-082165","fy":2011,"fp":"FY","form":"10-K","filed":"2012-02-28","frame":"CY2011Q4I"},{"end":"2012-12-31","val":240000000,"accn":"0001193125-13-077847","fy":2012,"fp":"FY","form":"10-K","filed":"2013-02-27","frame":"CY2012Q4I"},{"end":"2013-12-31","val":18000,"accn":"0000941138-14-000045","fy":2013,"fp":"FY","form":"10-K","filed":"2014-02-25","frame":"CY2013Q4I"}]}},"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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Assets, Current","description":"Amount of current assets classified as 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This item includes treasury stock repurchased by the entity. 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