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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":"2010-12-31","val":829000000,"accn":"0001193125-11-046932","fy":2010,"fp":"FY","form":"10-K","filed":"2011-02-25","frame":"CY2010Q4I"},{"end":"2011-12-31","val":875000000,"accn":"0001193125-12-077926","fy":2011,"fp":"FY","form":"10-K","filed":"2012-02-24","frame":"CY2011Q4I"},{"end":"2012-12-31","val":842000000,"accn":"0001193125-13-268973","fy":2012,"fp":"FY","form":"8-K","filed":"2013-06-24","frame":"CY2012Q4I"},{"end":"2012-12-31","val":842000000,"accn":"0001193125-13-071646","fy":2012,"fp":"FY","form":"10-K","filed":"2013-02-22"}]}},"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 outstanding).","units":{"USD":[{"end":"2010-12-31","val":704000000,"accn":"0001193125-11-046932","fy":2010,"fp":"FY","form":"10-K","filed":"2011-02-25","frame":"CY2010Q4I"},{"end":"2011-12-31","val":750000000,"accn":"0001193125-12-077926","fy":2011,"fp":"FY","form":"10-K","filed":"2012-02-24","frame":"CY2011Q4I"},{"end":"2012-12-31","val":642000000,"accn":"0001193125-13-268973","fy":2012,"fp":"FY","form":"8-K","filed":"2013-06-24","frame":"CY2012Q4I"},{"end":"2012-12-31","val":642000000,"accn":"0001193125-13-071646","fy":2012,"fp":"FY","form":"10-K","filed":"2013-02-22"}]}},"LitigationSettlementAmount":{"label":"Litigation Settlement, Amount (Deprecated 2017-01-31)","description":"Amount of judgment or settlement awarded to (against) the entity in respect of litigation.","units":{"USD":[{"start":"2012-04-01","end":"2012-06-30","val":70000000,"accn":"0000316709-13-000013","fy":2013,"fp":"Q2","form":"10-Q","filed":"2013-08-06"},{"start":"2012-04-01","end":"2012-06-30","val":70000000,"accn":"0000316709-13-000020","fy":2013,"fp":"Q3","form":"10-Q","filed":"2013-11-06","frame":"CY2012Q2"},{"start":"2012-01-01","end":"2012-09-30","val":70000000,"accn":"0000316709-13-000020","fy":2013,"fp":"Q3","form":"10-Q","filed":"2013-11-06"},{"start":"2012-01-01","end":"2012-12-31","val":70000000,"accn":"0000316709-14-000005","fy":2013,"fp":"FY","form":"10-K","filed":"2014-02-24"},{"start":"2012-01-01","end":"2012-12-31","val":70000000,"accn":"0000316709-15-000014","fy":2014,"fp":"FY","form":"10-K","filed":"2015-02-23","frame":"CY2012"},{"start":"2014-01-01","end":"2014-12-31","val":45000000,"accn":"0000316709-15-000014","fy":2014,"fp":"FY","form":"10-K","filed":"2015-02-23"},{"start":"2014-01-01","end":"2014-12-31","val":45000000,"accn":"0000316709-16-000067","fy":2015,"fp":"FY","form":"10-K","filed":"2016-02-24"},{"start":"2014-01-01","end":"2014-12-31","val":45000000,"accn":"0000316709-17-000010","fy":2016,"fp":"FY","form":"10-K","filed":"2017-02-23","frame":"CY2014"}]}},"LoansAndLeasesReceivableAllowance":{"label":"Loans and Leases Receivable, Allowance","description":"Amount of allowance to cover probable credit losses on loans and leases. 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TaxRate":{"label":"Unrecognized 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