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This element is intended to be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements.","units":{"USD":[{"end":"2012-03-31","val":5700000,"accn":"0001193125-14-074786","fy":2013,"fp":"FY","form":"10-K","filed":"2014-02-28","frame":"CY2012Q1I"},{"end":"2012-03-31","val":5700000,"accn":"0001193125-13-079663","fy":2012,"fp":"FY","form":"10-K","filed":"2013-02-27"},{"end":"2012-03-31","val":5700000,"accn":"0001193125-12-438637","fy":2012,"fp":"Q3","form":"10-Q","filed":"2012-10-29"},{"end":"2012-03-31","val":5700000,"accn":"0001193125-12-333963","fy":2012,"fp":"Q1","form":"8-K","filed":"2012-08-03"},{"end":"2012-03-31","val":5700000,"accn":"0001193125-12-333931","fy":2012,"fp":"Q2","form":"10-Q","filed":"2012-08-03"},{"end":"2012-03-31","val":5700000,"accn":"0001193125-12-213374","fy":2012,"fp":"Q1","form":"10-Q","filed":"2012-05-07"}]}},"AssetsHeldForSaleCurrent":{"label":"Assets Held-for-sale, Current (Deprecated 2014-01-31)","description":"Current assets (normally turning over within one year or one business cycle if longer) that are held for sale apart from normal operations and anticipated to be sold within one year.","units":{"USD":[{"end":"2012-06-30","val":35064000,"accn":"0001193125-12-333931","fy":2012,"fp":"Q2","form":"10-Q","filed":"2012-08-03","frame":"CY2012Q2I"},{"end":"2012-12-31","val":11450000,"accn":"0001193125-14-074786","fy":2013,"fp":"FY","form":"10-K","filed":"2014-02-28","frame":"CY2012Q4I"},{"end":"2012-12-31","val":11450000,"accn":"0001193125-13-414887","fy":2013,"fp":"Q3","form":"10-Q","filed":"2013-10-29"},{"end":"2012-12-31","val":11450000,"accn":"0001193125-13-306490","fy":2013,"fp":"Q2","form":"10-Q","filed":"2013-07-29"},{"end":"2012-12-31","val":11450000,"accn":"0001193125-13-198002","fy":2013,"fp":"Q1","form":"10-Q","filed":"2013-05-03"},{"end":"2012-12-31","val":11450000,"accn":"0001193125-13-079663","fy":2012,"fp":"FY","form":"10-K","filed":"2013-02-27"}]}},"BusinessAcquisitionPurchasePriceAllocationAssetsAcquired":{"label":"Business Acquisition, Purchase Price Allocation, Assets Acquired (Deprecated 2013-01-31)","description":"The amount of acquisition cost of a business combination allocated to assets acquired.","units":{"USD":[{"end":"2011-12-31","val":97800000,"accn":"0001193125-12-333950","fy":2011,"fp":"FY","form":"8-K","filed":"2012-08-03","frame":"CY2011Q4I"},{"end":"2011-12-31","val":97800000,"accn":"0001193125-12-077008","fy":2011,"fp":"FY","form":"10-K","filed":"2012-02-24"}]}},"BusinessAcquisitionPurchasePriceAllocationAssetsAcquiredLiabilitiesAssumedNet":{"label":"Business Acquisition, Purchase Price Allocation, Assets Acquired (Liabilities Assumed), Net (Deprecated 2013-01-31)","description":"The total purchase price of the acquired entity. 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and Cash Equivalents, Period Increase (Decrease)","description":"Amount of increase (decrease) in cash and cash equivalents. 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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":30148000,"accn":"0001193125-13-079663","fy":2012,"fp":"FY","form":"10-K","filed":"2013-02-27","frame":"CY2012Q4I"},{"end":"2013-12-31","val":30071000,"accn":"0001193125-14-074786","fy":2013,"fp":"FY","form":"10-K","filed":"2014-02-28","frame":"CY2013Q4I"}]}},"FiniteLivedIntangibleAssetsAmortizationExpenseYearThree":{"label":"Finite-Lived Intangible Asset, Expected Amortization, Year Three","description":"Amount of amortization for assets, excluding financial assets and goodwill, lacking physical substance with finite life expected to be recognized in third fiscal year following current fiscal year. 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Line of Credit","description":"The carrying value as of the balance sheet date of the current and noncurrent portions 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 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period.","units":{"pure":[{"start":"2011-01-01","end":"2011-12-31","val":0.027,"accn":"0001193125-12-333950","fy":2011,"fp":"FY","form":"8-K","filed":"2012-08-03","frame":"CY2011"},{"start":"2011-01-01","end":"2011-12-31","val":0.027,"accn":"0001193125-12-077008","fy":2011,"fp":"FY","form":"10-K","filed":"2012-02-24"},{"start":"2012-01-01","end":"2012-03-31","val":0.029,"accn":"0001193125-12-333963","fy":2012,"fp":"Q1","form":"8-K","filed":"2012-08-03","frame":"CY2012Q1"},{"start":"2012-01-01","end":"2012-03-31","val":0.029,"accn":"0001193125-12-213374","fy":2012,"fp":"Q1","form":"10-Q","filed":"2012-05-07"},{"start":"2012-01-01","end":"2012-06-30","val":0.031,"accn":"0001193125-12-333931","fy":2012,"fp":"Q2","form":"10-Q","filed":"2012-08-03"},{"start":"2012-01-01","end":"2012-09-30","val":0.033,"accn":"0001193125-12-438637","fy":2012,"fp":"Q3","form":"10-Q","filed":"2012-10-29"},{"start":"2012-01-01","end":"2012-12-31","val":0.034,"accn":"0001193125-13-079663","fy":2012,"fp":"FY","form":"10-K","filed":"2013-02-27","frame":"CY2012"},{"start":"2013-01-01","end":"2013-03-31","val":0.032,"accn":"0001193125-13-198002","fy":2013,"fp":"Q1","form":"10-Q","filed":"2013-05-03","frame":"CY2013Q1"},{"start":"2013-01-01","end":"2013-06-30","val":0.033,"accn":"0001193125-13-306490","fy":2013,"fp":"Q2","form":"10-Q","filed":"2013-07-29"},{"start":"2013-01-01","end":"2013-09-30","val":0.034,"accn":"0001193125-13-414887","fy":2013,"fp":"Q3","form":"10-Q","filed":"2013-10-29"},{"start":"2013-01-01","end":"2013-12-31","val":0.033,"accn":"0001193125-14-074786","fy":2013,"fp":"FY","form":"10-K","filed":"2014-02-28","frame":"CY2013"}]}},"LineOfCreditFacilityMaximumBorrowingCapacity":{"label":"Line of Credit Facility, Maximum Borrowing Capacity","description":"Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility.","units":{"USD":[{"end":"2011-04-19","val":1200000000,"accn":"0001193125-12-333950","fy":2011,"fp":"FY","form":"8-K","filed":"2012-08-03","frame":"CY2011Q1I"},{"end":"2011-04-19","val":1200000000,"accn":"0001193125-12-077008","fy":2011,"fp":"FY","form":"10-K","filed":"2012-02-24"}]}},"LineOfCreditFacilityRemainingBorrowingCapacity":{"label":"Line of Credit Facility, Remaining Borrowing Capacity","description":"Amount of borrowing capacity currently available under the credit facility (current borrowing capacity less the amount of borrowings 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Debt","description":"Amount, after unamortized (discount) premium and debt issuance costs, of long-term debt. 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":708000000,"accn":"0001193125-12-333950","fy":2011,"fp":"FY","form":"8-K","filed":"2012-08-03","frame":"CY2010Q4I"},{"end":"2010-12-31","val":708000000,"accn":"0001193125-12-077008","fy":2011,"fp":"FY","form":"10-K","filed":"2012-02-24"},{"end":"2011-12-31","val":841000000,"accn":"0001193125-13-079663","fy":2012,"fp":"FY","form":"10-K","filed":"2013-02-27","frame":"CY2011Q4I"},{"end":"2011-12-31","val":841000000,"accn":"0001193125-12-333950","fy":2011,"fp":"FY","form":"8-K","filed":"2012-08-03"},{"end":"2011-12-31","val":841000000,"accn":"0001193125-12-077008","fy":2011,"fp":"FY","form":"10-K","filed":"2012-02-24"},{"end":"2012-12-31","val":1490000000,"accn":"0001193125-14-074786","fy":2013,"fp":"FY","form":"10-K","filed":"2014-02-28","frame":"CY2012Q4I"},{"end":"2012-12-31","val":1490000000,"accn":"0001193125-13-079663","fy":2012,"fp":"FY","form":"10-K","filed":"2013-02-27"},{"end":"2013-12-31","val":1735100000,"accn":"0001193125-14-074786","fy":2013,"fp":"FY","form":"10-K","filed":"2014-02-28","frame":"CY2013Q4I"}]}},"LongTermDebtFairValue":{"label":"Long-term Debt, Fair Value","description":"The fair value amount of long-term debt whether such amount is presented as a separate caption or as a parenthetical disclosure. 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":"2011-12-31","val":303000000,"accn":"0001193125-12-333950","fy":2011,"fp":"FY","form":"8-K","filed":"2012-08-03","frame":"CY2011Q4I"},{"end":"2011-12-31","val":303000000,"accn":"0001193125-12-077008","fy":2011,"fp":"FY","form":"10-K","filed":"2012-02-24"},{"end":"2012-03-31","val":304500000,"accn":"0001193125-12-333963","fy":2012,"fp":"Q1","form":"8-K","filed":"2012-08-03","frame":"CY2012Q1I"},{"end":"2012-03-31","val":304500000,"accn":"0001193125-12-213374","fy":2012,"fp":"Q1","form":"10-Q","filed":"2012-05-07"},{"end":"2012-06-30","val":919500000,"accn":"0001193125-12-333931","fy":2012,"fp":"Q2","form":"10-Q","filed":"2012-08-03","frame":"CY2012Q2I"},{"end":"2012-09-30","val":930800000,"accn":"0001193125-12-438637","fy":2012,"fp":"Q3","form":"10-Q","filed":"2012-10-29","frame":"CY2012Q3I"},{"end":"2012-12-31","val":963800000,"accn":"0001193125-13-079663","fy":2012,"fp":"FY","form":"10-K","filed":"2013-02-27","frame":"CY2012Q4I"},{"end":"2013-03-31","val":947300000,"accn":"0001193125-13-198002","fy":2013,"fp":"Q1","form":"10-Q","filed":"2013-05-03","frame":"CY2013Q1I"},{"end":"2013-06-30","val":1300000000,"accn":"0001193125-13-306490","fy":2013,"fp":"Q2","form":"10-Q","filed":"2013-07-29","frame":"CY2013Q2I"},{"end":"2013-09-30","val":1300000000,"accn":"0001193125-13-414887","fy":2013,"fp":"Q3","form":"10-Q","filed":"2013-10-29","frame":"CY2013Q3I"},{"end":"2013-12-31","val":1200000000,"accn":"0001193125-14-074786","fy":2013,"fp":"FY","form":"10-K","filed":"2014-02-28","frame":"CY2013Q4I"}]}},"LongTermDebtMaturitiesRepaymentsOfPrincipalAfterYearFive":{"label":"Long-Term Debt, Maturity, after 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 after 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":300000000,"accn":"0001193125-12-333950","fy":2011,"fp":"FY","form":"8-K","filed":"2012-08-03","frame":"CY2011Q4I"},{"end":"2011-12-31","val":300000000,"accn":"0001193125-12-077008","fy":2011,"fp":"FY","form":"10-K","filed":"2012-02-24"},{"end":"2012-12-31","val":900000000,"accn":"0001193125-13-079663","fy":2012,"fp":"FY","form":"10-K","filed":"2013-02-27","frame":"CY2012Q4I"},{"end":"2013-12-31","val":872600000,"accn":"0001193125-14-074786","fy":2013,"fp":"FY","form":"10-K","filed":"2014-02-28","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":541000000,"accn":"0001193125-12-333950","fy":2011,"fp":"FY","form":"8-K","filed":"2012-08-03","frame":"CY2011Q4I"},{"end":"2011-12-31","val":541000000,"accn":"0001193125-12-077008","fy":2011,"fp":"FY","form":"10-K","filed":"2012-02-24"},{"end":"2013-12-31","val":300000000,"accn":"0001193125-14-074786","fy":2013,"fp":"FY","form":"10-K","filed":"2014-02-28","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":"2012-12-31","val":590000000,"accn":"0001193125-13-079663","fy":2012,"fp":"FY","form":"10-K","filed":"2013-02-27","frame":"CY2012Q4I"}]}},"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":"2013-12-31","val":562500000,"accn":"0001193125-14-074786","fy":2013,"fp":"FY","form":"10-K","filed":"2014-02-28","frame":"CY2013Q4I"}]}},"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":708000000,"accn":"0001193125-12-333950","fy":2011,"fp":"FY","form":"8-K","filed":"2012-08-03","frame":"CY2010Q4I"},{"end":"2010-12-31","val":708000000,"accn":"0001193125-12-077008","fy":2011,"fp":"FY","form":"10-K","filed":"2012-02-24"},{"end":"2011-12-31","val":841000000,"accn":"0001193125-13-079663","fy":2012,"fp":"FY","form":"10-K","filed":"2013-02-27","frame":"CY2011Q4I"},{"end":"2011-12-31","val":841000000,"accn":"0001193125-12-333950","fy":2011,"fp":"FY","form":"8-K","filed":"2012-08-03"},{"end":"2011-12-31","val":841000000,"accn":"0001193125-12-077008","fy":2011,"fp":"FY","form":"10-K","filed":"2012-02-24"},{"end":"2012-12-31","val":1490000000,"accn":"0001193125-14-074786","fy":2013,"fp":"FY","form":"10-K","filed":"2014-02-28","frame":"CY2012Q4I"},{"end":"2012-12-31","val":1490000000,"accn":"0001193125-13-079663","fy":2012,"fp":"FY","form":"10-K","filed":"2013-02-27"},{"end":"2013-12-31","val":1735100000,"accn":"0001193125-14-074786","fy":2013,"fp":"FY","form":"10-K","filed":"2014-02-28","frame":"CY2013Q4I"}]}},"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 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