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aggregate amount of recurring noncash expense charged against earnings in the period to allocate the cost of assets over their estimated remaining economic 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Cash Equivalents, Restricted Cash and Restricted Cash Equivalents","description":"Amount of cash and cash equivalents, and cash and cash equivalents restricted to withdrawal or usage. Excludes amount for disposal group and discontinued operations. Cash includes, but is not limited to, currency on hand, demand deposits with banks or financial institutions, and other accounts with general characteristics of demand deposits. Cash equivalents include, but are not limited to, short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates.","units":{"USD":[{"end":"2016-12-31","val":1050957000,"accn":"0001193125-18-155137","fy":2018,"fp":"Q1","form":"10-Q","filed":"2018-05-08","frame":"CY2016Q4I"},{"end":"2017-03-31","val":968949000,"accn":"0001193125-18-155137","fy":2018,"fp":"Q1","form":"10-Q","filed":"2018-05-08","frame":"CY2017Q1I"},{"end":"2017-12-31","val":1368024000,"accn":"0001193125-18-155137","fy":2018,"fp":"Q1","form":"10-Q","filed":"2018-05-08","frame":"CY2017Q4I"},{"end":"2018-03-31","val":1158548000,"accn":"0001193125-18-155137","fy":2018,"fp":"Q1","form":"10-Q","filed":"2018-05-08","frame":"CY2018Q1I"}]}},"CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect":{"label":"Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents, Period Increase (Decrease), Including Exchange Rate Effect","description":"Amount of increase (decrease) in cash, cash equivalents, and cash and cash equivalents restricted to withdrawal or usage; including effect from exchange rate change. Cash includes, but is not limited to, currency on hand, demand deposits with banks or financial institutions, and other accounts with general characteristics of demand deposits. Cash equivalents include, but are not limited to, short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates.","units":{"USD":[{"start":"2017-01-01","end":"2017-03-31","val":-82008000,"accn":"0001193125-18-155137","fy":2018,"fp":"Q1","form":"10-Q","filed":"2018-05-08","frame":"CY2017Q1"},{"start":"2018-01-01","end":"2018-03-31","val":-209476000,"accn":"0001193125-18-155137","fy":2018,"fp":"Q1","form":"10-Q","filed":"2018-05-08","frame":"CY2018Q1"}]}},"CashDividendsPaidToParentCompany":{"label":"SEC Schedule, 12-04, Cash Dividends Paid to Registrant, Subsidiaries and Equity Method Investees","description":"This element represents disclosure of the total aggregate cash dividends paid to the entity by consolidated subsidiaries, by unconsolidated subsidiaries, and by 50% or less owned persons accounted for using the equity method.","units":{"USD":[{"start":"2009-01-01","end":"2009-12-31","val":11000000,"accn":"0001193125-12-083433","fy":2011,"fp":"FY","form":"10-K","filed":"2012-02-28","frame":"CY2009"},{"start":"2010-01-01","end":"2010-12-31","val":0,"accn":"0001193125-13-082063","fy":2012,"fp":"FY","form":"10-K","filed":"2013-02-28","frame":"CY2010"},{"start":"2010-01-01","end":"2010-12-31","val":0,"accn":"0001193125-12-083433","fy":2011,"fp":"FY","form":"10-K","filed":"2012-02-28"},{"start":"2011-01-01","end":"2011-12-31","val":0,"accn":"0001193125-13-082063","fy":2012,"fp":"FY","form":"10-K","filed":"2013-02-28","frame":"CY2011"},{"start":"2011-01-01","end":"2011-12-31","val":0,"accn":"0001193125-12-083433","fy":2011,"fp":"FY","form":"10-K","filed":"2012-02-28"}]}},"CashEquivalentsAtCarryingValue":{"label":"Cash Equivalents, at Carrying Value","description":"Amount of short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates. Excludes cash and cash equivalents within disposal group and discontinued 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Shares issued include shares outstanding and shares held in the treasury.","units":{"shares":[{"end":"2009-12-31","val":37749000,"accn":"0001193125-10-190757","fy":2010,"fp":"Q2","form":"10-Q/A","filed":"2010-08-17"},{"end":"2009-12-31","val":37749000,"accn":"0001193125-10-251108","fy":2010,"fp":"Q3","form":"10-Q","filed":"2010-11-08"},{"end":"2009-12-31","val":37749000,"accn":"0001193125-11-048718","fy":2010,"fp":"FY","form":"10-K","filed":"2011-02-28","frame":"CY2009Q4I"},{"end":"2010-06-30","val":37833000,"accn":"0001193125-10-190757","fy":2010,"fp":"Q2","form":"10-Q/A","filed":"2010-08-17","frame":"CY2010Q2I"},{"end":"2010-09-30","val":37938000,"accn":"0001193125-10-251108","fy":2010,"fp":"Q3","form":"10-Q","filed":"2010-11-08","frame":"CY2010Q3I"},{"end":"2010-12-31","val":38025000,"accn":"0001193125-11-048718","fy":2010,"fp":"FY","form":"10-K","filed":"2011-02-28"},{"end":"2010-12-31","val":38025000,"accn":"0001193125-11-131449","fy":2011,"fp":"Q1","form":"10-Q","filed":"2011-05-09"},{"end":"2010-12-31","val":38284000,"accn":"0001193125-11-241722","fy":2011,"fp":"Q2","form":"10-Q/A","filed":"2011-09-07"},{"end":"2010-12-31","val":38025000,"accn":"0001193125-11-300799","fy":2011,"fp":"Q3","form":"10-Q","filed":"2011-11-08"},{"end":"2010-12-31","val":38025000,"accn":"0001193125-12-083433","fy":2011,"fp":"FY","form":"10-K","filed":"2012-02-28","frame":"CY2010Q4I"},{"end":"2011-03-31","val":38284000,"accn":"0001193125-11-131449","fy":2011,"fp":"Q1","form":"10-Q","filed":"2011-05-09","frame":"CY2011Q1I"},{"end":"2011-06-30","val":38306000,"accn":"0001193125-11-241722","fy":2011,"fp":"Q2","form":"10-Q/A","filed":"2011-09-07","frame":"CY2011Q2I"},{"end":"2011-09-30","val":38072000,"accn":"0001193125-11-300799","fy":2011,"fp":"Q3","form":"10-Q","filed":"2011-11-08","frame":"CY2011Q3I"},{"end":"2011-12-31","val":38082000,"accn":"0001193125-12-083433","fy":2011,"fp":"FY","form":"10-K","filed":"2012-02-28"},{"end":"2011-12-31","val":38082000,"accn":"0001193125-12-220248","fy":2012,"fp":"Q1","form":"10-Q","filed":"2012-05-09"},{"end":"2011-12-31","val":38082000,"accn":"0001193125-12-342513","fy":2012,"fp":"Q2","form":"10-Q","filed":"2012-08-08"},{"end":"2011-12-31","val":38082,"accn":"0001193125-12-458922","fy":2012,"fp":"Q3","form":"10-Q","filed":"2012-11-08"},{"end":"2011-12-31","val":38082000,"accn":"0001193125-13-082063","fy":2012,"fp":"FY","form":"10-K","filed":"2013-02-28","frame":"CY2011Q4I"},{"end":"2012-03-31","val":37993000,"accn":"0001193125-12-220248","fy":2012,"fp":"Q1","form":"10-Q","filed":"2012-05-09","frame":"CY2012Q1I"},{"end":"2012-06-30","val":38013000,"accn":"0001193125-12-342513","fy":2012,"fp":"Q2","form":"10-Q","filed":"2012-08-08","frame":"CY2012Q2I"},{"end":"2012-09-30","val":38031,"accn":"0001193125-12-458922","fy":2012,"fp":"Q3","form":"10-Q","filed":"2012-11-08","frame":"CY2012Q3I"},{"end":"2012-12-31","val":38089000,"accn":"0001193125-13-082063","fy":2012,"fp":"FY","form":"10-K","filed":"2013-02-28"},{"end":"2012-12-31","val":38089000,"accn":"0001193125-13-208973","fy":2013,"fp":"Q1","form":"10-Q","filed":"2013-05-09"},{"end":"2012-12-31","val":38089000,"accn":"0001193125-13-325422","fy":2013,"fp":"Q2","form":"10-Q","filed":"2013-08-08"},{"end":"2012-12-31","val":38089000,"accn":"0001193125-13-433889","fy":2013,"fp":"Q3","form":"10-Q","filed":"2013-11-08","frame":"CY2012Q4I"},{"end":"2013-03-31","val":38238000,"accn":"0001193125-13-208973","fy":2013,"fp":"Q1","form":"10-Q","filed":"2013-05-09","frame":"CY2013Q1I"},{"end":"2013-06-30","val":38279000,"accn":"0001193125-13-325422","fy":2013,"fp":"Q2","form":"10-Q","filed":"2013-08-08","frame":"CY2013Q2I"},{"end":"2013-09-30","val":38293000,"accn":"0001193125-13-433889","fy":2013,"fp":"Q3","form":"10-Q","filed":"2013-11-08","frame":"CY2013Q3I"},{"end":"2016-12-31","val":38742000,"accn":"0001193125-18-062134","fy":2017,"fp":"FY","form":"10-K","filed":"2018-02-28","frame":"CY2016Q4I"},{"end":"2017-12-31","val":38898000,"accn":"0001193125-18-062134","fy":2017,"fp":"FY","form":"10-K","filed":"2018-02-28"},{"end":"2017-12-31","val":38898000,"accn":"0001193125-18-155137","fy":2018,"fp":"Q1","form":"10-Q","filed":"2018-05-08","frame":"CY2017Q4I"},{"end":"2018-03-31","val":38917000,"accn":"0001193125-18-155137","fy":2018,"fp":"Q1","form":"10-Q","filed":"2018-05-08","frame":"CY2018Q1I"}]}},"CommonStockSharesOutstanding":{"label":"Common Stock, Shares, Outstanding","description":"Number of shares of common stock outstanding. Common stock represent the ownership interest in a corporation.","units":{"shares":[{"end":"2008-12-31","val":38095000,"accn":"0001193125-12-083433","fy":2011,"fp":"FY","form":"10-K","filed":"2012-02-28","frame":"CY2008Q4I"},{"end":"2009-12-31","val":37749000,"accn":"0001193125-10-190757","fy":2010,"fp":"Q2","form":"10-Q/A","filed":"2010-08-17"},{"end":"2009-12-31","val":37749000,"accn":"0001193125-10-251108","fy":2010,"fp":"Q3","form":"10-Q","filed":"2010-11-08"},{"end":"2009-12-31","val":37749000,"accn":"0001193125-11-048718","fy":2010,"fp":"FY","form":"10-K","filed":"2011-02-28"},{"end":"2009-12-31","val":37749000,"accn":"0001193125-12-083433","fy":2011,"fp":"FY","form":"10-K","filed":"2012-02-28"},{"end":"2009-12-31","val":37749000,"accn":"0001193125-13-082063","fy":2012,"fp":"FY","form":"10-K","filed":"2013-02-28","frame":"CY2009Q4I"},{"end":"2010-06-30","val":37833000,"accn":"0001193125-10-190757","fy":2010,"fp":"Q2","form":"10-Q/A","filed":"2010-08-17","frame":"CY2010Q2I"},{"end":"2010-09-30","val":37938000,"accn":"0001193125-10-251108","fy":2010,"fp":"Q3","form":"10-Q","filed":"2010-11-08","frame":"CY2010Q3I"},{"end":"2010-12-31","val":38025000,"accn":"0001193125-11-048718","fy":2010,"fp":"FY","form":"10-K","filed":"2011-02-28"},{"end":"2010-12-31","val":38025000,"accn":"0001193125-11-131449","fy":2011,"fp":"Q1","form":"10-Q","filed":"2011-05-09"},{"end":"2010-12-31","val":38284000,"accn":"0001193125-11-241722","fy":2011,"fp":"Q2","form":"10-Q/A","filed":"2011-09-07"},{"end":"2010-12-31","val":38025000,"accn":"0001193125-11-300799","fy":2011,"fp":"Q3","form":"10-Q","filed":"2011-11-08"},{"end":"2010-12-31","val":38025000,"accn":"0001193125-12-083433","fy":2011,"fp":"FY","form":"10-K","filed":"2012-02-28"},{"end":"2010-12-31","val":38025000,"accn":"0001193125-13-082063","fy":2012,"fp":"FY","form":"10-K","filed":"2013-02-28"},{"end":"2010-12-31","val":38025000,"accn":"0001193125-14-074594","fy":2013,"fp":"FY","form":"10-K","filed":"2014-02-28","frame":"CY2010Q4I"},{"end":"2011-03-31","val":38284000,"accn":"0001193125-11-131449","fy":2011,"fp":"Q1","form":"10-Q","filed":"2011-05-09","frame":"CY2011Q1I"},{"end":"2011-06-30","val":38306000,"accn":"0001193125-11-241722","fy":2011,"fp":"Q2","form":"10-Q/A","filed":"2011-09-07","frame":"CY2011Q2I"},{"end":"2011-09-30","val":38072000,"accn":"0001193125-11-300799","fy":2011,"fp":"Q3","form":"10-Q","filed":"2011-11-08","frame":"CY2011Q3I"},{"end":"2011-12-31","val":38082000,"accn":"0001193125-12-083433","fy":2011,"fp":"FY","form":"10-K","filed":"2012-02-28"},{"end":"2011-12-31","val":38082000,"accn":"0001193125-12-220248","fy":2012,"fp":"Q1","form":"10-Q","filed":"2012-05-09"},{"end":"2011-12-31","val":38082000,"accn":"0001193125-12-342513","fy":2012,"fp":"Q2","form":"10-Q","filed":"2012-08-08"},{"end":"2011-12-31","val":38082,"accn":"0001193125-12-458922","fy":2012,"fp":"Q3","form":"10-Q","filed":"2012-11-08"},{"end":"2011-12-31","val":38082000,"accn":"0001193125-13-082063","fy":2012,"fp":"FY","form":"10-K","filed":"2013-02-28"},{"end":"2011-12-31","val":38082000,"accn":"0001193125-14-074594","fy":2013,"fp":"FY","form":"10-K","filed":"2014-02-28"},{"end":"2011-12-31","val":38082000,"accn":"0001193125-15-071754","fy":2014,"fp":"FY","form":"10-K","filed":"2015-03-02","frame":"CY2011Q4I"},{"end":"2012-03-31","val":37993000,"accn":"0001193125-12-220248","fy":2012,"fp":"Q1","form":"10-Q","filed":"2012-05-09","frame":"CY2012Q1I"},{"end":"2012-06-30","val":38013000,"accn":"0001193125-12-342513","fy":2012,"fp":"Q2","form":"10-Q","filed":"2012-08-08","frame":"CY2012Q2I"},{"end":"2012-09-30","val":38031,"accn":"0001193125-12-458922","fy":2012,"fp":"Q3","form":"10-Q","filed":"2012-11-08","frame":"CY2012Q3I"},{"end":"2012-12-31","val":38089000,"accn":"0001193125-13-082063","fy":2012,"fp":"FY","form":"10-K","filed":"2013-02-28"},{"end":"2012-12-31","val":38089000,"accn":"0001193125-13-208973","fy":2013,"fp":"Q1","form":"10-Q","filed":"2013-05-09"},{"end":"2012-12-31","val":38089000,"accn":"0001193125-13-325422","fy":2013,"fp":"Q2","form":"10-Q","filed":"2013-08-08"},{"end":"2012-12-31","val":38089000,"accn":"0001193125-13-433889","fy":2013,"fp":"Q3","form":"10-Q","filed":"2013-11-08"},{"end":"2012-12-31","val":38089000,"accn":"0001193125-14-074594","fy":2013,"fp":"FY","form":"10-K","filed":"2014-02-28"},{"end":"2012-12-31","val":38089000,"accn":"0001193125-15-071754","fy":2014,"fp":"FY","form":"10-K","filed":"2015-03-02"},{"end":"2012-12-31","val":38089000,"accn":"0001193125-16-479332","fy":2015,"fp":"FY","form":"10-K","filed":"2016-02-26","frame":"CY2012Q4I"},{"end":"2013-03-31","val":38238000,"accn":"0001193125-13-208973","fy":2013,"fp":"Q1","form":"10-Q","filed":"2013-05-09","frame":"CY2013Q1I"},{"end":"2013-06-30","val":38279000,"accn":"0001193125-13-325422","fy":2013,"fp":"Q2","form":"10-Q","filed":"2013-08-08","frame":"CY2013Q2I"},{"end":"2013-09-30","val":38293000,"accn":"0001193125-13-433889","fy":2013,"fp":"Q3","form":"10-Q","filed":"2013-11-08","frame":"CY2013Q3I"},{"end":"2013-12-31","val":38326000,"accn":"0001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Stock, Value, Issued","description":"Aggregate par or stated value of issued nonredeemable common stock (or common stock redeemable solely at the option of the issuer). 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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fCashAcquired":{"label":"Payments 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2014,"fp":"FY","form":"10-K","filed":"2015-03-02"},{"end":"2014-12-31","val":540778000,"accn":"0001193125-15-178208","fy":2015,"fp":"Q1","form":"10-Q","filed":"2015-05-08"},{"end":"2014-12-31","val":540778000,"accn":"0001193125-15-281880","fy":2015,"fp":"Q2","form":"10-Q","filed":"2015-08-07"},{"end":"2014-12-31","val":540778000,"accn":"0001193125-15-369097","fy":2015,"fp":"Q3","form":"10-Q","filed":"2015-11-06"},{"end":"2014-12-31","val":540778000,"accn":"0001193125-16-479332","fy":2015,"fp":"FY","form":"10-K","filed":"2016-02-26","frame":"CY2014Q4I"},{"end":"2015-03-31","val":531393000,"accn":"0001193125-15-178208","fy":2015,"fp":"Q1","form":"10-Q","filed":"2015-05-08","frame":"CY2015Q1I"},{"end":"2015-06-30","val":540977000,"accn":"0001193125-15-281880","fy":2015,"fp":"Q2","form":"10-Q","filed":"2015-08-07","frame":"CY2015Q2I"},{"end":"2015-09-30","val":523867000,"accn":"0001193125-15-369097","fy":2015,"fp":"Q3","form":"10-Q","filed":"2015-11-06","frame":"CY2015Q3I"},{"end":"2015-12-31","val":508692000,"accn":"0001193125-16-479332","fy":2015,"fp":"FY","form":"10-K","filed":"2016-02-26"},{"end":"2015-12-31","val":508692000,"accn":"0001193125-16-582686","fy":2016,"fp":"Q1","form":"10-Q","filed":"2016-05-09"},{"end":"2015-12-31","val":508692000,"accn":"0001193125-16-674189","fy":2016,"fp":"Q2","form":"10-Q","filed":"2016-08-08"},{"end":"2015-12-31","val":508692000,"accn":"0001193125-16-759461","fy":2016,"fp":"Q3","form":"10-Q","filed":"2016-11-04"},{"end":"2015-12-31","val":508692000,"accn":"0001193125-17-057489","fy":2016,"fp":"FY","form":"10-K","filed":"2017-02-27","frame":"CY2015Q4I"},{"end":"2016-03-31","val":506756000,"accn":"0001193125-16-582686","fy":2016,"fp":"Q1","form":"10-Q","filed":"2016-05-09","frame":"CY2016Q1I"},{"end":"2016-06-30","val":508156000,"accn":"0001193125-16-674189","fy":2016,"fp":"Q2","form":"10-Q","filed":"2016-08-08","frame":"CY2016Q2I"},{"end":"2016-09-30","val":525899000,"accn":"0001193125-16-759461","fy":2016,"fp":"Q3","form":"10-Q","filed":"2016-11-04","frame":"CY2016Q3I"},{"end":"2016-12-31","val":503631000,"accn":"0001193125-17-057489","fy":2016,"fp":"FY","form":"10-K","filed":"2017-02-27"},{"end":"2016-12-31","val":503631000,"accn":"0001193125-17-161648","fy":2017,"fp":"Q1","form":"10-Q","filed":"2017-05-08"},{"end":"2016-12-31","val":503631000,"accn":"0001193125-17-249198","fy":2017,"fp":"Q2","form":"10-Q","filed":"2017-08-07"},{"end":"2016-12-31","val":503631000,"accn":"0001193125-17-331838","fy":2017,"fp":"Q3","form":"10-Q","filed":"2017-11-03"},{"end":"2016-12-31","val":503631000,"accn":"0001193125-18-062134","fy":2017,"fp":"FY","form":"10-K","filed":"2018-02-28","frame":"CY2016Q4I"},{"end":"2017-03-31","val":497082000,"accn":"0001193125-17-161648","fy":2017,"fp":"Q1","form":"10-Q","filed":"2017-05-08","frame":"CY2017Q1I"},{"end":"2017-06-30","val":517565000,"accn":"0001193125-17-249198","fy":2017,"fp":"Q2","form":"10-Q","filed":"2017-08-07","frame":"CY2017Q2I"},{"end":"2017-09-30","val":529734000,"accn":"0001193125-17-331838","fy":2017,"fp":"Q3","form":"10-Q","filed":"2017-11-03","frame":"CY2017Q3I"},{"end":"2017-12-31","val":529717000,"accn":"0001193125-18-062134","fy":2017,"fp":"FY","form":"10-K","filed":"2018-02-28"},{"end":"2017-12-31","val":529717000,"accn":"0001193125-18-155137","fy":2018,"fp":"Q1","form":"10-Q","filed":"2018-05-08","frame":"CY2017Q4I"},{"end":"2018-03-31","val":545419000,"accn":"0001193125-18-155137","fy":2018,"fp":"Q1","form":"10-Q","filed":"2018-05-08","frame":"CY2018Q1I"}]}},"PropertyPlantAndEquipmentSalvageValue":{"label":"Property, Plant, and Equipment, Salvage Value","description":"The estimated or actual value of the asset at the end of its useful life or when it is no longer serviceable (cannot be used for its original purpose).","units":{"USD":[{"end":"2013-12-31","val":0,"accn":"0001193125-14-074594","fy":2013,"fp":"FY","form":"10-K","filed":"2014-02-28","frame":"CY2013Q4I"},{"end":"2014-12-31","val":0,"accn":"0001193125-15-071754","fy":2014,"fp":"FY","form":"10-K","filed":"2015-03-02","frame":"CY2014Q4I"},{"end":"2015-12-31","val":0,"accn":"0001193125-16-479332","fy":2015,"fp":"FY","form":"10-K","filed":"2016-02-26","frame":"CY2015Q4I"},{"end":"2016-12-31","val":0,"accn":"0001193125-17-057489","fy":2016,"fp":"FY","form":"10-K","filed":"2017-02-27","frame":"CY2016Q4I"},{"end":"2017-12-31","val":0,"accn":"0001193125-18-062134","fy":2017,"fp":"FY","form":"10-K","filed":"2018-02-28","frame":"CY2017Q4I"}]}},"ProvisionForDoubtfulAccounts":{"label":"Accounts Receivable, Credit Loss Expense 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Amount excludes temporary equity. Alternate caption for the concept is permanent 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