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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":"2015-12-31","val":96824000,"accn":"0001193125-19-049831","fy":2018,"fp":"FY","form":"10-K","filed":"2019-02-25","frame":"CY2015Q4I"},{"end":"2016-12-31","val":109427000,"accn":"0001193125-18-143527","fy":2018,"fp":"Q1","form":"10-Q","filed":"2018-04-30"},{"end":"2016-12-31","val":109426000,"accn":"0001193125-18-231462","fy":2018,"fp":"Q2","form":"10-Q","filed":"2018-07-30"},{"end":"2016-12-31","val":109426000,"accn":"0001193125-18-316365","fy":2018,"fp":"Q3","form":"10-Q","filed":"2018-11-02"},{"end":"2016-12-31","val":109426000,"accn":"0001193125-19-049831","fy":2018,"fp":"FY","form":"10-K","filed":"2019-02-25","frame":"CY2016Q4I"},{"end":"2017-03-31","val":104920000,"accn":"0001193125-18-143527","fy":2018,"fp":"Q1","form":"10-Q","filed":"2018-04-30","frame":"CY2017Q1I"},{"end":"2017-06-30","val":101631000,"accn":"0001193125-18-231462","fy":2018,"fp":"Q2","form":"10-Q","filed":"2018-07-30","frame":"CY2017Q2I"},{"end":"2017-09-30","val":97530000,"accn":"0001193125-18-316365","fy":2018,"fp":"Q3","form":"10-Q","filed":"2018-11-02","frame":"CY2017Q3I"},{"end":"2017-12-31","val":100809000,"accn":"0001193125-18-143527","fy":2018,"fp":"Q1","form":"10-Q","filed":"2018-04-30"},{"end":"2017-12-31","val":100809000,"accn":"0001193125-18-231462","fy":2018,"fp":"Q2","form":"10-Q","filed":"2018-07-30"},{"end":"2017-12-31","val":100809000,"accn":"0001193125-18-316365","fy":2018,"fp":"Q3","form":"10-Q","filed":"2018-11-02"},{"end":"2017-12-31","val":100809000,"accn":"0001193125-19-049831","fy":2018,"fp":"FY","form":"10-K","filed":"2019-02-25"},{"end":"2017-12-31","val":100809000,"accn":"0001193125-19-120907","fy":2019,"fp":"Q1","form":"10-Q","filed":"2019-04-26"},{"end":"2017-12-31","val":100809000,"accn":"0001193125-19-203240","fy":2019,"fp":"Q2","form":"10-Q","filed":"2019-07-26","frame":"CY2017Q4I"},{"end":"2018-03-31","val":101351000,"accn":"0001193125-18-143527","fy":2018,"fp":"Q1","form":"10-Q","filed":"2018-04-30"},{"end":"2018-03-31","val":101351000,"accn":"0001193125-19-120907","fy":2019,"fp":"Q1","form":"10-Q","filed":"2019-04-26","frame":"CY2018Q1I"},{"end":"2018-06-30","val":84819000,"accn":"0001193125-18-231462","fy":2018,"fp":"Q2","form":"10-Q","filed":"2018-07-30"},{"end":"2018-06-30","val":84819000,"accn":"0001193125-19-203240","fy":2019,"fp":"Q2","form":"10-Q","filed":"2019-07-26","frame":"CY2018Q2I"},{"end":"2018-09-30","val":76120000,"accn":"0001193125-18-316365","fy":2018,"fp":"Q3","form":"10-Q","filed":"2018-11-02","frame":"CY2018Q3I"},{"end":"2018-12-31","val":66106000,"accn":"0001193125-19-049831","fy":2018,"fp":"FY","form":"10-K","filed":"2019-02-25"},{"end":"2018-12-31","val":66106000,"accn":"0001193125-19-120907","fy":2019,"fp":"Q1","form":"10-Q","filed":"2019-04-26"},{"end":"2018-12-31","val":66106000,"accn":"0001193125-19-203240","fy":2019,"fp":"Q2","form":"10-Q","filed":"2019-07-26","frame":"CY2018Q4I"},{"end":"2019-03-31","val":52354000,"accn":"0001193125-19-120907","fy":2019,"fp":"Q1","form":"10-Q","filed":"2019-04-26","frame":"CY2019Q1I"},{"end":"2019-06-30","val":53763000,"accn":"0001193125-19-203240","fy":2019,"fp":"Q2","form":"10-Q","filed":"2019-07-26","frame":"CY2019Q2I"}]}},"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. 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Additionally, this element may be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements. The element may be used in both the balance sheet and disclosure in the same submission.","units":{"USD":[{"end":"2012-06-30","val":42300000,"accn":"0001193125-12-319815","fy":2012,"fp":"Q2","form":"10-Q","filed":"2012-07-27","frame":"CY2012Q2I"},{"end":"2012-09-30","val":32300000,"accn":"0001193125-12-441301","fy":2012,"fp":"Q3","form":"10-Q","filed":"2012-10-30","frame":"CY2012Q3I"},{"end":"2012-12-31","val":22300000,"accn":"0001193125-13-087668","fy":2012,"fp":"FY","form":"10-K","filed":"2013-03-01","frame":"CY2012Q4I"},{"end":"2013-03-31","val":12300000,"accn":"0001193125-13-192404","fy":2013,"fp":"Q1","form":"10-Q","filed":"2013-05-01","frame":"CY2013Q1I"}]}},"LongTermDebtNoncurrent":{"label":"Long-term Debt, Excluding Current Maturities","description":"Amount after unamortized (discount) premium and debt issuance costs of long-term debt classified as noncurrent and excluding amounts to be repaid within one year or the normal operating cycle, if longer. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations.","units":{"USD":[{"end":"2010-12-31","val":57504000,"accn":"0001193125-12-092133","fy":2011,"fp":"FY","form":"10-K","filed":"2012-03-01","frame":"CY2010Q4I"},{"end":"2010-12-31","val":57504000,"accn":"0001193125-11-290678","fy":2011,"fp":"Q3","form":"10-Q","filed":"2011-11-01"},{"end":"2010-12-31","val":57504000,"accn":"0001193125-11-206341","fy":2011,"fp":"Q2","form":"10-Q","filed":"2011-08-02"},{"end":"2011-06-30","val":47344000,"accn":"0001193125-11-206341","fy":2011,"fp":"Q2","form":"10-Q","filed":"2011-08-02","frame":"CY2011Q2I"},{"end":"2011-09-30","val":37321000,"accn":"0001193125-11-290678","fy":2011,"fp":"Q3","form":"10-Q","filed":"2011-11-01","frame":"CY2011Q3I"},{"end":"2011-12-31","val":27321000,"accn":"0001193125-13-087668","fy":2012,"fp":"FY","form":"10-K","filed":"2013-03-01","frame":"CY2011Q4I"},{"end":"2011-12-31","val":27321000,"accn":"0001193125-12-441301","fy":2012,"fp":"Q3","form":"10-Q","filed":"2012-10-30"},{"end":"2011-12-31","val":27321000,"accn":"0001193125-12-319815","fy":2012,"fp":"Q2","form":"10-Q","filed":"2012-07-27"},{"end":"2011-12-31","val":27321000,"accn":"0001193125-12-200717","fy":2012,"fp":"Q1","form":"10-Q","filed":"2012-05-01"},{"end":"2011-12-31","val":27321000,"accn":"0001193125-12-092133","fy":2011,"fp":"FY","form":"10-K","filed":"2012-03-01"},{"end":"2012-03-31","val":42321000,"accn":"0001193125-12-200717","fy":2012,"fp":"Q1","form":"10-Q","filed":"2012-05-01","frame":"CY2012Q1I"},{"end":"2012-06-30","val":32321000,"accn":"0001193125-12-319815","fy":2012,"fp":"Q2","form":"10-Q","filed":"2012-07-27","frame":"CY2012Q2I"},{"end":"2012-09-30","val":22321000,"accn":"0001193125-12-441301","fy":2012,"fp":"Q3","form":"10-Q","filed":"2012-10-30","frame":"CY2012Q3I"},{"end":"2012-12-31","val":12321000,"accn":"0001193125-14-093952","fy":2013,"fp":"FY","form":"10-K","filed":"2014-03-11","frame":"CY2012Q4I"},{"end":"2012-12-31","val":12321000,"accn":"0001193125-13-420841","fy":2013,"fp":"Q3","form":"10-Q","filed":"2013-10-31"},{"end":"2012-12-31","val":12321000,"accn":"0001193125-13-304750","fy":2013,"fp":"Q2","form":"10-Q","filed":"2013-07-26"},{"end":"2012-12-31","val":12321000,"accn":"0001193125-13-192404","fy":2013,"fp":"Q1","form":"10-Q","filed":"2013-05-01"},{"end":"2012-12-31","val":12321000,"accn":"0001193125-13-087668","fy":2012,"fp":"FY","form":"10-K","filed":"2013-03-01"}]}},"LongTermLineOfCredit":{"label":"Long-term Line of Credit, Noncurrent","description":"The carrying value as of the balance sheet date of the noncurrent portion of long-term obligations drawn from a line of credit, which is a bank's commitment to make loans up to a specific amount. Examples of items that might be included in the application of this element may consist of letters of credit, standby letters of credit, and revolving credit arrangements, under which borrowings can be made up to a maximum amount as of any point in time conditional on satisfaction of specified terms before, as of and after the date of drawdowns on the line. Includes short-term obligations that would normally be classified as current liabilities but for which (a) postbalance sheet date issuance of a long term obligation to refinance the short term obligation on a long term basis, or (b) the enterprise has entered into a financing agreement that clearly permits the enterprise to refinance the short-term obligation on a long term basis and the following conditions are met (1) the agreement does not expire within 1 year and is not cancelable by the lender except for violation of an objectively determinable provision, (2) no violation exists at the BS date, and (3) the lender has entered into the financing agreement is expected to be financially capable of honoring the agreement.","units":{"USD":[{"end":"2016-12-31","val":105000000,"accn":"0001193125-17-060429","fy":2016,"fp":"FY","form":"10-K","filed":"2017-02-28"},{"end":"2016-12-31","val":105000000,"accn":"0001193125-17-148137","fy":2017,"fp":"Q1","form":"10-Q","filed":"2017-04-28"},{"end":"2016-12-31","val":105000000,"accn":"0001193125-17-242353","fy":2017,"fp":"Q2","form":"10-Q","filed":"2017-07-31"},{"end":"2016-12-31","val":105000000,"accn":"0001193125-17-329399","fy":2017,"fp":"Q3","form":"10-Q","filed":"2017-11-01"},{"end":"2016-12-31","val":105000000,"accn":"0001193125-18-060842","fy":2017,"fp":"FY","form":"10-K","filed":"2018-02-27","frame":"CY2016Q4I"},{"end":"2017-03-31","val":102000000,"accn":"0001193125-17-148137","fy":2017,"fp":"Q1","form":"10-Q","filed":"2017-04-28","frame":"CY2017Q1I"},{"end":"2017-06-30","val":99000000,"accn":"0001193125-17-242353","fy":2017,"fp":"Q2","form":"10-Q","filed":"2017-07-31","frame":"CY2017Q2I"},{"end":"2017-09-30","val":96000000,"accn":"0001193125-17-329399","fy":2017,"fp":"Q3","form":"10-Q","filed":"2017-11-01","frame":"CY2017Q3I"},{"end":"2017-12-31","val":93000000,"accn":"0001193125-18-060842","fy":2017,"fp":"FY","form":"10-K","filed":"2018-02-27"},{"end":"2017-12-31","val":93000000,"accn":"0001193125-18-143527","fy":2018,"fp":"Q1","form":"10-Q","filed":"2018-04-30"},{"end":"2017-12-31","val":93000000,"accn":"0001193125-18-231462","fy":2018,"fp":"Q2","form":"10-Q","filed":"2018-07-30"},{"end":"2017-12-31","val":93000000,"accn":"0001193125-18-316365","fy":2018,"fp":"Q3","form":"10-Q","filed":"2018-11-02"},{"end":"2017-12-31","val":93000000,"accn":"0001193125-19-049831","fy":2018,"fp":"FY","form":"10-K","filed":"2019-02-25","frame":"CY2017Q4I"},{"end":"2018-03-31","val":90000000,"accn":"0001193125-18-143527","fy":2018,"fp":"Q1","form":"10-Q","filed":"2018-04-30","frame":"CY2018Q1I"},{"end":"2018-06-30","val":85000000,"accn":"0001193125-18-231462","fy":2018,"fp":"Q2","form":"10-Q","filed":"2018-07-30","frame":"CY2018Q2I"},{"end":"2018-09-30","val":80000000,"accn":"0001193125-18-316365","fy":2018,"fp":"Q3","form":"10-Q","filed":"2018-11-02","frame":"CY2018Q3I"},{"end":"2018-12-31","val":75000000,"accn":"0001193125-19-049831","fy":2018,"fp":"FY","form":"10-K","filed":"2019-02-25"},{"end":"2018-12-31","val":75000000,"accn":"0001193125-19-120907","fy":2019,"fp":"Q1","form":"10-Q","filed":"2019-04-26"},{"end":"2018-12-31","val":75000000,"accn":"0001193125-19-203240","fy":2019,"fp":"Q2","form":"10-Q","filed":"2019-07-26","frame":"CY2018Q4I"},{"end":"2019-03-31","val":70000000,"accn":"0001193125-19-120907","fy":2019,"fp":"Q1","form":"10-Q","filed":"2019-04-26","frame":"CY2019Q1I"},{"end":"2019-06-30","val":65000000,"accn":"0001193125-19-203240","fy":2019,"fp":"Q2","form":"10-Q","filed":"2019-07-26","frame":"CY2019Q2I"}]}},"NetCashProvidedByUsedInFinancingActivities":{"label":"Net Cash Provided by (Used in) Financing Activities","description":"Amount of cash inflow (outflow) from financing activities, including discontinued operations. 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