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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":"2014-06-30","val":0,"accn":"0001193125-14-302544","fy":2014,"fp":"Q2","form":"10-Q","filed":"2014-08-08","frame":"CY2014Q2I"},{"end":"2014-12-31","val":0,"accn":"0001193125-15-070282","fy":2014,"fp":"FY","form":"10-K","filed":"2015-02-27","frame":"CY2014Q4I"},{"end":"2015-03-31","val":0,"accn":"0001193125-15-179686","fy":2015,"fp":"Q1","form":"10-Q","filed":"2015-05-08","frame":"CY2015Q1I"},{"end":"2015-06-30","val":0,"accn":"0001193125-15-282846","fy":2015,"fp":"Q2","form":"10-Q","filed":"2015-08-07","frame":"CY2015Q2I"},{"end":"2015-09-30","val":0,"accn":"0001193125-15-370106","fy":2015,"fp":"Q3","form":"10-Q","filed":"2015-11-06","frame":"CY2015Q3I"}]}},"AvailableForSaleSecuritiesDebtMaturitiesAfterOneThroughFiveYearsFairValue":{"label":"Debt Securities, Available-for-Sale, Fair Value, Maturity, Allocated and Single Maturity Date, after Year One Through Five","description":"Fair value of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale), with single maturity date and allocated without single maturity date, maturing in second through fifth fiscal year following current fiscal year. 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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. This item represents Available-for-sale Securities which consist of all investments in certain debt and equity securities neither classified as trading or held-to-maturity securities. A debt security represents a creditor relationship with an enterprise. Debt securities include, among other items, US Treasury securities, US government securities, municipal securities, corporate bonds, convertible debt, commercial paper, and all securitized debt instruments. An equity security represents an ownership interest in an enterprise or the right to acquire or dispose of an ownership interest in an enterprise at fixed or determinable prices. Equity securities include, among other things, common stock, certain preferred stock, warrant rights, call options, and put options, but do not include convertible debt. An entity may opt to provide the reader with additional narrative text to better understand the nature of investments in debt and equity securities which are categorized as Available-for-sale.","units":{"USD":[{"end":"2012-09-30","val":359753000,"accn":"0001193125-12-448922","fy":2012,"fp":"Q3","form":"10-Q","filed":"2012-11-02","frame":"CY2012Q3I"},{"end":"2012-12-31","val":398414000,"accn":"0001193125-13-078993","fy":2012,"fp":"FY","form":"10-K","filed":"2013-02-27","frame":"CY2012Q4I"},{"end":"2013-03-31","val":184838000,"accn":"0001193125-13-207330","fy":2013,"fp":"Q1","form":"10-Q","filed":"2013-05-08","frame":"CY2013Q1I"}]}},"AvailableForSaleSecuritiesGrossUnrealizedGainLoss":{"label":"Available-for-sale Securities, Gross Unrealized Gain (Loss) (Deprecated 2013-01-31)","description":"The net amount of gross unrealized gains (losses) for securities, at a point in time, which are categorized neither as held-to-maturity nor trading securities.","units":{"USD":[{"end":"2010-12-31","val":400000,"accn":"0001193125-12-089350","fy":2011,"fp":"FY","form":"10-K","filed":"2012-02-29","frame":"CY2010Q4I"},{"end":"2011-12-31","val":-300000,"accn":"0001193125-13-078993","fy":2012,"fp":"FY","form":"10-K","filed":"2013-02-27","frame":"CY2011Q4I"},{"end":"2011-12-31","val":-300000,"accn":"0001193125-12-089350","fy":2011,"fp":"FY","form":"10-K","filed":"2012-02-29"},{"end":"2012-12-31","val":200000,"accn":"0001193125-13-078993","fy":2012,"fp":"FY","form":"10-K","filed":"2013-02-27","frame":"CY2012Q4I"}]}},"AvailableForSaleSecuritiesIncomeTaxExpenseOnChangeInUnrealizedHoldingGainOrLoss":{"label":"Available-for-sale Securities, Income Tax Expense on Change in Unrealized Holding Gain (Loss) (Deprecated 2018-01-31)","description":"This item represents the tax effects occurring during the period which are related to the net unrealized gain (loss) resulting from changes in the fair [carrying] value during the period of available-for-sale securities. 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Cash and cash equivalents are the amount of currency on hand as well as demand deposits with banks or financial institutions. Includes other kinds of accounts that have the general characteristics of demand deposits. Also includes 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. Includes effect from exchange rate 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Cash Equivalents, and Short-term Investments","description":"Cash includes currency on hand as well as demand deposits with banks or financial institutions. It also includes other kinds of accounts that have the general characteristics of demand deposits in that the customer may deposit additional funds at any time and effectively may withdraw funds at any time without prior notice or penalty. Cash equivalents, excluding items classified as marketable securities, include short-term, highly liquid Investments that are both readily convertible to known amounts of cash, and so near their maturity that they present minimal risk of changes in value because of changes in interest rates. Generally, only investments with original maturities of three months or less qualify under that definition. Original maturity means original maturity to the entity holding the investment. For example, both a three-month US Treasury bill and a three-year Treasury note purchased three months from maturity qualify as cash equivalents. However, a Treasury note purchased three years ago does not become a cash equivalent when its remaining maturity is three months. Short-term investments, exclusive of cash equivalents, generally consist of marketable securities intended to be sold within one year (or the normal operating cycle if longer) and may include trading securities, available-for-sale securities, or held-to-maturity securities (if maturing within one year), as applicable.","units":{"USD":[{"end":"2009-12-31","val":625596000,"accn":"0000950123-10-073891","fy":2010,"fp":"Q2","form":"10-Q","filed":"2010-08-06"},{"end":"2009-12-31","val":625596000,"accn":"0000950123-10-101726","fy":2010,"fp":"Q3","form":"10-Q","filed":"2010-11-05"},{"end":"2009-12-31","val":625596000,"accn":"0000950123-11-018362","fy":2010,"fp":"FY","form":"10-K","filed":"2011-02-25","frame":"CY2009Q4I"},{"end":"2010-06-30","val":663353000,"accn":"0000950123-10-073891","fy":2010,"fp":"Q2","form":"10-Q","filed":"2010-08-06","frame":"CY2010Q2I"},{"end":"2010-09-30","val":640357000,"accn":"0000950123-10-101726","fy":2010,"fp":"Q3","form":"10-Q","filed":"2010-11-05","frame":"CY2010Q3I"},{"end":"2010-12-31","val":620102000,"accn":"0000950123-11-018362","fy":2010,"fp":"FY","form":"10-K","filed":"2011-02-25"},{"end":"2010-12-31","val":620102000,"accn":"0000950123-11-046402","fy":2011,"fp":"Q1","form":"10-Q","filed":"2011-05-06"},{"end":"2010-12-31","val":620102000,"accn":"0000950123-11-073329","fy":2011,"fp":"Q2","form":"10-Q","filed":"2011-08-05"},{"end":"2010-12-31","val":620102000,"accn":"0001193125-11-297291","fy":2011,"fp":"Q3","form":"10-Q","filed":"2011-11-04"},{"end":"2010-12-31","val":620102000,"accn":"0001193125-12-089350","fy":2011,"fp":"FY","form":"10-K","filed":"2012-02-29","frame":"CY2010Q4I"},{"end":"2011-03-31","val":619609000,"accn":"0000950123-11-046402","fy":2011,"fp":"Q1","form":"10-Q","filed":"2011-05-06","frame":"CY2011Q1I"},{"end":"2011-06-30","val":591535000,"accn":"0000950123-11-073329","fy":2011,"fp":"Q2","form":"10-Q","filed":"2011-08-05","frame":"CY2011Q2I"},{"end":"2011-09-30","val":574977000,"accn":"0001193125-11-297291","fy":2011,"fp":"Q3","form":"10-Q","filed":"2011-11-04","frame":"CY2011Q3I"},{"end":"2011-12-31","val":518779000,"accn":"0001193125-12-089350","fy":2011,"fp":"FY","form":"10-K","filed":"2012-02-29"},{"end":"2011-12-31","val":518779000,"accn":"0001193125-12-214108","fy":2012,"fp":"Q1","form":"10-Q","filed":"2012-05-07"},{"end":"2011-12-31","val":518779000,"accn":"0001193125-12-337080","fy":2012,"fp":"Q2","form":"10-Q","filed":"2012-08-06"},{"end":"2011-12-31","val":518779000,"accn":"0001193125-12-448922","fy":2012,"fp":"Q3","form":"10-Q","filed":"2012-11-02"},{"end":"2011-12-31","val":518779000,"accn":"0001193125-13-078993","fy":2012,"fp":"FY","form":"10-K","filed":"2013-02-27","frame":"CY2011Q4I"},{"end":"2012-03-31","val":514347000,"accn":"0001193125-12-214108","fy":2012,"fp":"Q1","form":"10-Q","filed":"2012-05-07","frame":"CY2012Q1I"},{"end":"2012-06-30","val":539561000,"accn":"0001193125-12-337080","fy":2012,"fp":"Q2","form":"10-Q","filed":"2012-08-06","frame":"CY2012Q2I"},{"end":"2012-09-30","val":548406000,"accn":"0001193125-12-448922","fy":2012,"fp":"Q3","form":"10-Q","filed":"2012-11-02","frame":"CY2012Q3I"},{"end":"2012-12-31","val":530117000,"accn":"0001193125-13-078993","fy":2012,"fp":"FY","form":"10-K","filed":"2013-02-27"},{"end":"2012-12-31","val":530117000,"accn":"0001193125-13-207330","fy":2013,"fp":"Q1","form":"10-Q","filed":"2013-05-08"},{"end":"2012-12-31","val":530117000,"accn":"0001193125-13-326384","fy":2013,"fp":"Q2","form":"10-Q","filed":"2013-08-08"},{"end":"2012-12-31","val":530117000,"accn":"0001193125-13-434713","fy":2013,"fp":"Q3","form":"10-Q","filed":"2013-11-08"},{"end":"2012-12-31","val":530117000,"accn":"0001193125-14-079303","fy":2013,"fp":"FY","form":"10-K","filed":"2014-03-03","frame":"CY2012Q4I"},{"end":"2013-03-31","val":608389000,"accn":"0001193125-13-207330","fy":2013,"fp":"Q1","form":"10-Q","filed":"2013-05-08","frame":"CY2013Q1I"},{"end":"2013-06-30","val":741225000,"accn":"0001193125-13-326384","fy":2013,"fp":"Q2","form":"10-Q","filed":"2013-08-08","frame":"CY2013Q2I"},{"end":"2013-09-30","val":666501000,"accn":"0001193125-13-434713","fy":2013,"fp":"Q3","form":"10-Q","filed":"2013-11-08","frame":"CY2013Q3I"},{"end":"2013-12-31","val":509798000,"accn":"0001193125-14-079303","fy":2013,"fp":"FY","form":"10-K","filed":"2014-03-03"},{"end":"2013-12-31","val":509798000,"accn":"0001193125-14-193905","fy":2014,"fp":"Q1","form":"10-Q","filed":"2014-05-12"},{"end":"2013-12-31","val":509798000,"accn":"0001193125-14-302544","fy":2014,"fp":"Q2","form":"10-Q","filed":"2014-08-08"},{"end":"2013-12-31","val":509798000,"accn":"0001193125-14-402925","fy":2014,"fp":"Q3","form":"10-Q","filed":"2014-11-07"},{"end":"2013-12-31","val":509798000,"accn":"0001193125-15-070282","fy":2014,"fp":"FY","form":"10-K","filed":"2015-02-27","frame":"CY2013Q4I"},{"end":"2014-03-31","val":521525000,"accn":"0001193125-14-193905","fy":2014,"fp":"Q1","form":"10-Q","filed":"2014-05-12","frame":"CY2014Q1I"},{"end":"2014-06-30","val":551863000,"accn":"0001193125-14-302544","fy":2014,"fp":"Q2","form":"10-Q","filed":"2014-08-08","frame":"CY2014Q2I"},{"end":"2014-09-30","val":593816000,"accn":"0001193125-14-402925","fy":2014,"fp":"Q3","form":"10-Q","filed":"2014-11-07","frame":"CY2014Q3I"},{"end":"2014-12-31","val":692538000,"accn":"0001193125-15-070282","fy":2014,"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Also includes payments made under a postretirement benefit plan, including prescription drug benefits, health care benefits, life insurance benefits, and legal, educational and advisory services. This item represents a periodic decrease to the plan obligations and a decrease to plan 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of the carrying amounts as of the balance sheet date of all 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taxonomy.","units":{"USD":[{"start":"2012-01-01","end":"2012-12-31","val":700000,"accn":"0001193125-13-078993","fy":2012,"fp":"FY","form":"10-K","filed":"2013-02-27","frame":"CY2012"}]}},"ProceedsFromSaleOfOtherProductiveAssets":{"label":"Proceeds from Sale of Other Productive Assets","description":"Amount of cash inflow from the sale of tangible or intangible assets used to produce goods or deliver services, classified as other.","units":{"USD":[{"start":"2012-01-01","end":"2012-03-31","val":3249000,"accn":"0001193125-13-207330","fy":2013,"fp":"Q1","form":"10-Q","filed":"2013-05-08","frame":"CY2012Q1"},{"start":"2012-01-01","end":"2012-03-31","val":3249000,"accn":"0001193125-12-214108","fy":2012,"fp":"Q1","form":"10-Q","filed":"2012-05-07"},{"start":"2012-01-01","end":"2012-06-30","val":3249000,"accn":"0001193125-13-326384","fy":2013,"fp":"Q2","form":"10-Q","filed":"2013-08-08"},{"start":"2012-01-01","end":"2012-06-30","val":3249000,"accn":"0001193125-12-337080","fy":2012,"fp":"Q2","form":"10-Q","filed":"2012-08-06"},{"start":"2012-01-01","end":"2012-09-30","val":3249000,"accn":"0001193125-13-434713","fy":2013,"fp":"Q3","form":"10-Q","filed":"2013-11-08"},{"start":"2012-01-01","end":"2012-09-30","val":3249000,"accn":"0001193125-12-448922","fy":2012,"fp":"Q3","form":"10-Q","filed":"2012-11-02"},{"start":"2012-01-01","end":"2012-12-31","val":3249000,"accn":"0001193125-14-079303","fy":2013,"fp":"FY","form":"10-K","filed":"2014-03-03","frame":"CY2012"},{"start":"2012-01-01","end":"2012-12-31","val":3249000,"accn":"0001193125-13-078993","fy":2012,"fp":"FY","form":"10-K","filed":"2013-02-27"}]}},"ProceedsFromSaleOfPropertyHeldForSale":{"label":"Proceeds 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Amount excludes temporary equity. Alternate caption for the concept is permanent equity.","units":{"USD":[{"end":"2014-12-31","val":1690761000,"accn":"0001193125-15-282846","fy":2015,"fp":"Q2","form":"10-Q","filed":"2015-08-07"},{"end":"2014-12-31","val":1690761000,"accn":"0001193125-15-370106","fy":2015,"fp":"Q3","form":"10-Q","filed":"2015-11-06","frame":"CY2014Q4I"},{"end":"2015-06-30","val":1778770000,"accn":"0001193125-15-282846","fy":2015,"fp":"Q2","form":"10-Q","filed":"2015-08-07","frame":"CY2015Q2I"},{"end":"2015-09-30","val":1790851000,"accn":"0001193125-15-370106","fy":2015,"fp":"Q3","form":"10-Q","filed":"2015-11-06","frame":"CY2015Q3I"}]}},"StockholdersEquityOther":{"label":"Stockholders' Equity, Other","description":"This element represents movements included in the statement of changes in stockholders' equity which are not separately disclosed or provided for elsewhere in the taxonomy.","units":{"USD":[{"start":"2014-01-01","end":"2014-12-31","val":1161000,"accn":"0001193125-15-070282","fy":2014,"fp":"FY","form":"10-K","filed":"2015-02-27","frame":"CY2014"}]}},"StockIssuedDuringPeriodSharesConversionOfConvertibleSecurities":{"label":"Stock Issued During Period, Shares, Conversion of Convertible Securities","description":"Number of shares issued during the period as a result of the conversion of convertible securities.","units":{"shares":[{"start":"2013-10-01","end":"2013-12-31","val":3100000,"accn":"0001193125-14-079303","fy":2013,"fp":"FY","form":"10-K","filed":"2014-03-03"},{"start":"2013-10-01","end":"2013-12-31","val":3100000,"accn":"0001193125-15-070282","fy":2014,"fp":"FY","form":"10-K","filed":"2015-02-27","frame":"CY2013Q4"}]}},"StockIssuedDuringPeriodSharesShareBasedCompensation":{"label":"Shares Issued, Shares, Share-based Payment Arrangement, after Forfeiture","description":"Number, after forfeiture, of shares or units issued under share-based payment arrangement. 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Y","form":"10-K","filed":"2015-02-27"},{"end":"2014-12-31","val":306330000,"accn":"0001193125-15-179686","fy":2015,"fp":"Q1","form":"10-Q","filed":"2015-05-08"},{"end":"2014-12-31","val":306330000,"accn":"0001193125-15-282846","fy":2015,"fp":"Q2","form":"10-Q","filed":"2015-08-07"},{"end":"2014-12-31","val":306330000,"accn":"0001193125-15-370106","fy":2015,"fp":"Q3","form":"10-Q","filed":"2015-11-06","frame":"CY2014Q4I"},{"end":"2015-03-31","val":331329000,"accn":"0001193125-15-179686","fy":2015,"fp":"Q1","form":"10-Q","filed":"2015-05-08","frame":"CY2015Q1I"},{"end":"2015-06-30","val":331329000,"accn":"0001193125-15-282846","fy":2015,"fp":"Q2","form":"10-Q","filed":"2015-08-07","frame":"CY2015Q2I"},{"end":"2015-09-30","val":331329000,"accn":"0001193125-15-370106","fy":2015,"fp":"Q3","form":"10-Q","filed":"2015-11-06","frame":"CY2015Q3I"}]}},"TreasuryStockValueAcquiredCostMethod":{"label":"Treasury 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