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Direct selling expenses (for example, credit, warranty, and advertising) are expenses that can be directly linked to the sale of specific products. Indirect selling expenses are expenses that cannot be directly linked to the sale of specific products, for example telephone expenses, Internet, and postal charges. 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This element is used when state law does not recognize treasury stock.","units":{"USD":[{"start":"2010-01-01","end":"2010-12-31","val":-3238000,"accn":"0001193125-11-249766","fy":2011,"fp":"Q2","form":"8-K","filed":"2011-09-16"},{"start":"2010-01-01","end":"2010-12-31","val":3238000,"accn":"0001193125-12-132298","fy":2011,"fp":"FY","form":"10-K","filed":"2012-03-26"},{"start":"2010-01-01","end":"2010-12-31","val":-3238000,"accn":"0001509432-13-000008","fy":2012,"fp":"FY","form":"10-K","filed":"2013-03-11","frame":"CY2010"},{"start":"2013-01-01","end":"2013-12-31","val":0,"accn":"0001509432-16-000146","fy":2015,"fp":"FY","form":"10-K","filed":"2016-02-26","frame":"CY2013"},{"start":"2015-01-01","end":"2015-03-31","val":288000,"accn":"0001509432-15-000055","fy":2015,"fp":"Q1","form":"10-Q","filed":"2015-05-07","frame":"CY2015Q1"},{"start":"2015-01-01","end":"2015-06-30","val":3541000,"accn":"0001509432-15-000092","fy":2015,"fp":"Q2","form":"10-Q","filed":"2015-08-04"},{"start":"2015-01-01","end":"2015-09-30","val":9367000,"accn":"0001509432-15-000109","fy":2015,"fp":"Q3","form":"10-Q","filed":"2015-11-02"},{"start":"2015-01-01","end":"2015-12-31","val":26175000,"accn":"0001509432-16-000146","fy":2015,"fp":"FY","form":"10-K","filed":"2016-02-26"},{"start":"2015-01-01","end":"2015-12-31","val":26175000,"accn":"0001509432-17-000015","fy":2016,"fp":"FY","form":"10-K","filed":"2017-02-28"},{"start":"2015-01-01","end":"2015-12-31","val":26175000,"accn":"0001509432-18-000015","fy":2017,"fp":"FY","form":"10-K","filed":"2018-03-05","frame":"CY2015"},{"start":"2016-01-01","end":"2016-03-31","val":23853000,"accn":"0001509432-16-000165","fy":2016,"fp":"Q1","form":"10-Q","filed":"2016-05-10","frame":"CY2016Q1"},{"start":"2016-01-01","end":"2016-06-30","val":39072000,"accn":"0001509432-16-000201","fy":2016,"fp":"Q2","form":"10-Q","filed":"2016-08-05"},{"start":"2016-01-01","end":"2016-09-30","val":50752000,"accn":"0001509432-16-000213","fy":2016,"fp":"Q3","form":"10-Q","filed":"2016-11-04"},{"start":"2016-01-01","end":"2016-12-31","val":60101000,"accn":"0001509432-17-000015","fy":2016,"fp":"FY","form":"10-K","filed":"2017-02-28"},{"start":"2016-01-01","end":"2016-12-31","val":60101000,"accn":"0001509432-18-000015","fy":2017,"fp":"FY","form":"10-K","filed":"2018-03-05","frame":"CY2016"},{"start":"2017-01-01","end":"2017-03-31","val":4491000,"accn":"0001509432-17-000045","fy":2017,"fp":"Q1","form":"10-Q","filed":"2017-05-04","frame":"CY2017Q1"},{"start":"2017-01-01","end":"2017-06-30","val":4783000,"accn":"0001509432-17-000075","fy":2017,"fp":"Q2","form":"10-Q","filed":"2017-08-03"},{"start":"2017-01-01","end":"2017-09-30","val":6629000,"accn":"0001509432-17-000096","fy":2017,"fp":"Q3","form":"10-Q","filed":"2017-11-02"},{"start":"2017-01-01","end":"2017-12-31","val":8290000,"accn":"0001509432-18-000015","fy":2017,"fp":"FY","form":"10-K","filed":"2018-03-05","frame":"CY2017"},{"start":"2018-01-01","end":"2018-03-31","val":0,"accn":"0001509432-18-000020","fy":2018,"fp":"Q1","form":"10-Q","filed":"2018-05-08","frame":"CY2018Q1"}]}},"StockRepurchaseProgramAuthorizedAmount1":{"label":"Stock Repurchase Program, Authorized Amount","description":"Amount of stock repurchase plan authorized.","units":{"USD":[{"end":"2015-02-10","val":75000000,"accn":"0001509432-17-000015","fy":2016,"fp":"FY","form":"10-K","filed":"2017-02-28"},{"end":"2015-02-10","val":75000000,"accn":"0001509432-18-000015","fy":2017,"fp":"FY","form":"10-K","filed":"2018-03-05","frame":"CY2014Q4I"},{"end":"2015-03-31","val":75000000,"accn":"0001509432-15-000055","fy":2015,"fp":"Q1","form":"10-Q","filed":"2015-05-07","frame":"CY2015Q1I"},{"end":"2015-06-30","val":75000000,"accn":"0001509432-15-000092","fy":2015,"fp":"Q2","form":"10-Q","filed":"2015-08-04","frame":"CY2015Q2I"},{"end":"2015-09-30","val":75000000,"accn":"0001509432-15-000109","fy":2015,"fp":"Q3","form":"10-Q","filed":"2015-11-02","frame":"CY2015Q3I"},{"end":"2015-12-31","val":75000000,"accn":"0001509432-16-000146","fy":2015,"fp":"FY","form":"10-K","filed":"2016-02-26"},{"end":"2015-12-31","val":75000000,"accn":"0001509432-16-000165","fy":2016,"fp":"Q1","form":"10-Q","filed":"2016-05-10"},{"end":"2015-12-31","val":75000000,"accn":"0001509432-16-000201","fy":2016,"fp":"Q2","form":"10-Q","filed":"2016-08-05"},{"end":"2015-12-31","val":75000000,"accn":"0001509432-16-000213","fy":2016,"fp":"Q3","form":"10-Q","filed":"2016-11-04","frame":"CY2015Q4I"},{"end":"2016-03-31","val":100000000,"accn":"0001509432-16-000165","fy":2016,"fp":"Q1","form":"10-Q","filed":"2016-05-10","frame":"CY2016Q1I"},{"end":"2016-06-30","val":150000000,"accn":"0001509432-16-000201","fy":2016,"fp":"Q2","form":"10-Q","filed":"2016-08-05","frame":"CY2016Q2I"},{"end":"2016-09-30","val":150000000,"accn":"0001509432-16-000213","fy":2016,"fp":"Q3","form":"10-Q","filed":"2016-11-04","frame":"CY2016Q3I"},{"end":"2016-12-31","val":150000000,"accn":"0001509432-17-000015","fy":2016,"fp":"FY","form":"10-K","filed":"2017-02-28"},{"end":"2016-12-31","val":75000000,"accn":"0001509432-17-000045","fy":2017,"fp":"Q1","form":"10-Q","filed":"2017-05-04"},{"end":"2016-12-31","val":75000000,"accn":"0001509432-17-000075","fy":2017,"fp":"Q2","form":"10-Q","filed":"2017-08-03"},{"end":"2016-12-31","val":75000000,"accn":"0001509432-17-000096","fy":2017,"fp":"Q3","form":"10-Q","filed":"2017-11-02","frame":"CY2016Q4I"},{"end":"2017-03-31","val":150000000,"accn":"0001509432-17-000045","fy":2017,"fp":"Q1","form":"10-Q","filed":"2017-05-04","frame":"CY2017Q1I"},{"end":"2017-06-30","val":150000000,"accn":"0001509432-17-000075","fy":2017,"fp":"Q2","form":"10-Q","filed":"2017-08-03","frame":"CY2017Q2I"},{"end":"2017-09-30","val":150000000,"accn":"0001509432-17-000096","fy":2017,"fp":"Q3","form":"10-Q","filed":"2017-11-02","frame":"CY2017Q3I"},{"end":"2017-12-31","val":150000000,"accn":"0001509432-18-000015","fy":2017,"fp":"FY","form":"10-K","filed":"2018-03-05"},{"end":"2017-12-31","val":75000000,"accn":"0001509432-18-000020","fy":2018,"fp":"Q1","form":"10-Q","filed":"2018-05-08","frame":"CY2017Q4I"},{"end":"2018-03-31","val":150000000,"accn":"0001509432-18-000020","fy":2018,"fp":"Q1","form":"10-Q","filed":"2018-05-08","frame":"CY2018Q1I"}]}},"TemporaryEquityCarryingAmount":{"label":"Temporary Equity, Carrying Amount (Deprecated 2012-01-31)","description":"The carrying value (book value) of an entity's issued and outstanding stock which is not included within permanent equity in Stockholders Equity. Temporary equity is a security with redemption features that are outside the control of the issuer, is not classified as an asset or liability in conformity with GAAP, and is not mandatorily redeemable. Includes any type of security that is redeemable at a fixed or determinable price or on a fixed or determinable date or dates, is redeemable at the option of the holder, or has conditions for redemption which are not solely within the control of the issuer. If convertible, the issuer does not control the actions or events necessary to issue the maximum number of shares that could be required to be delivered under the conversion option if the holder exercises the option to convert the stock to another class of equity. If the security is a warrant or a rights issue, the warrant or rights issue is considered to be temporary equity if the issuer cannot demonstrate that it would be able to deliver upon the exercise of the option by the holder in all cases. Includes stock with a put option held by an ESOP and stock redeemable by a holder only in the event of a change in control of the issuer.","units":{"USD":[{"end":"2009-12-31","val":59012000,"accn":"0001193125-11-249766","fy":2011,"fp":"Q2","form":"8-K","filed":"2011-09-16","frame":"CY2009Q4I"},{"end":"2010-12-31","val":62793000,"accn":"0001193125-12-132298","fy":2011,"fp":"FY","form":"10-K","filed":"2012-03-26","frame":"CY2010Q4I"},{"end":"2010-12-31","val":62793000,"accn":"0001193125-11-306964","fy":2011,"fp":"Q3","form":"10-Q","filed":"2011-11-10"},{"end":"2010-12-31","val":62793000,"accn":"0001193125-11-249766","fy":2011,"fp":"Q2","form":"8-K","filed":"2011-09-16"},{"end":"2010-12-31","val":62793000,"accn":"0001193125-11-218218","fy":2011,"fp":"Q2","form":"10-Q","filed":"2011-08-10"}]}},"TemporaryEquityLiquidationPreference":{"label":"Temporary Equity, Liquidation Preference","description":"The aggregate liquidation preference (or restrictions) of stock classified as temporary equity that has a preference in involuntary liquidation considerably in excess of the par or stated value of the shares. The liquidation preference is the difference between the preference in liquidation and the par or stated values of the share. Temporary equity is a security with redemption features that are outside the control of the issuer, is not classified as an asset or liability in conformity with GAAP, and is not mandatorily redeemable. Includes any type of security that is redeemable at a fixed or determinable price or on a fixed or determinable date or dates, is redeemable at the option of the holder, or has conditions for redemption which are not solely within the control of the issuer. If convertible, the issuer does not control the actions or events necessary to issue the maximum number of shares that could be required to be delivered under the conversion option if the holder exercises the option to convert the stock to another class of equity. If the security is a warrant or a rights issue, the warrant or rights issue is considered to be temporary equity if the issuer cannot demonstrate that it would be able to deliver upon the exercise of the option by the holder in all cases. Includes stock with put option held by ESOP and stock redeemable by holder only in the event of a change in control of the issuer.","units":{"USD":[{"end":"2009-12-31","val":60560000,"accn":"0001193125-11-249766","fy":2011,"fp":"Q2","form":"8-K","filed":"2011-09-16","frame":"CY2009Q4I"},{"end":"2010-12-31","val":64361000,"accn":"0001193125-12-132298","fy":2011,"fp":"FY","form":"10-K","filed":"2012-03-26","frame":"CY2010Q4I"},{"end":"2010-12-31","val":64361000,"accn":"0001193125-11-306964","fy":2011,"fp":"Q3","form":"10-Q","filed":"2011-11-10"},{"end":"2010-12-31","val":64361000,"accn":"0001193125-11-249766","fy":2011,"fp":"Q2","form":"8-K","filed":"2011-09-16"},{"end":"2010-12-31","val":64361000,"accn":"0001193125-11-218218","fy":2011,"fp":"Q2","form":"10-Q","filed":"2011-08-10"},{"end":"2011-06-30","val":0,"accn":"0001193125-11-249766","fy":2011,"fp":"Q2","form":"8-K","filed":"2011-09-16","frame":"CY2011Q2I"},{"end":"2011-06-30","val":0,"accn":"0001193125-11-218218","fy":2011,"fp":"Q2","form":"10-Q","filed":"2011-08-10"},{"end":"2011-09-30","val":0,"accn":"0001193125-11-306964","fy":2011,"fp":"Q3","form":"10-Q","filed":"2011-11-10","frame":"CY2011Q3I"},{"end":"2011-12-31","val":0,"accn":"0001193125-12-132298","fy":2011,"fp":"FY","form":"10-K","filed":"2012-03-26","frame":"CY2011Q4I"}]}},"TemporaryEquityParOrStatedValuePerShare":{"label":"Temporary Equity, Par or Stated Value Per Share","description":"Per share amount of par value or stated value of stock classified as temporary equity. Temporary equity is a security with redemption features that are outside the control of the issuer, is not classified as an asset or liability in conformity with GAAP, and is not mandatorily redeemable.","units":{"USD/shares":[{"end":"2009-12-31","val":0.0001,"accn":"0001193125-11-249766","fy":2011,"fp":"Q2","form":"8-K","filed":"2011-09-16","frame":"CY2009Q4I"},{"end":"2010-12-31","val":0.0001,"accn":"0001193125-12-132298","fy":2011,"fp":"FY","form":"10-K","filed":"2012-03-26","frame":"CY2010Q4I"},{"end":"2010-12-31","val":0.0001,"accn":"0001193125-11-306964","fy":2011,"fp":"Q3","form":"10-Q","filed":"2011-11-10"},{"end":"2010-12-31","val":0.0001,"accn":"0001193125-11-249766","fy":2011,"fp":"Q2","form":"8-K","filed":"2011-09-16"},{"end":"2010-12-31","val":0.0001,"accn":"0001193125-11-218218","fy":2011,"fp":"Q2","form":"10-Q","filed":"2011-08-10"},{"end":"2011-06-30","val":0.0001,"accn":"0001193125-11-249766","fy":2011,"fp":"Q2","form":"8-K","filed":"2011-09-16","frame":"CY2011Q2I"},{"end":"2011-06-30","val":0.0001,"accn":"0001193125-11-218218","fy":2011,"fp":"Q2","form":"10-Q","filed":"2011-08-10"},{"end":"2011-09-30","val":0.0001,"accn":"0001193125-11-306964","fy":2011,"fp":"Q3","form":"10-Q","filed":"2011-11-10","frame":"CY2011Q3I"},{"end":"2011-12-31","val":0.0001,"accn":"0001193125-12-132298","fy":2011,"fp":"FY","form":"10-K","filed":"2012-03-26","frame":"CY2011Q4I"}]}},"TemporaryEquitySharesAuthorized":{"label":"Temporary Equity, Shares Authorized","description":"The maximum number of securities classified as temporary equity that are permitted to be issued by an entity's charter and bylaws. Temporary equity is a security with redemption features that are outside the control of the issuer, is not classified as an asset or liability in conformity with GAAP, and is not mandatorily redeemable. Includes any type of security that is redeemable at a fixed or determinable price or on a fixed or determinable date or dates, is redeemable at the option of the holder, or has conditions for redemption which are not solely within the control of the issuer. If convertible, the issuer does not control the actions or events necessary to issue the maximum number of shares that could be required to be delivered under the conversion option if the holder exercises the option to convert the stock to another class of equity. If the security is a warrant or a rights issue, the warrant or rights issue is considered to be temporary equity if the issuer cannot demonstrate that it would be able to deliver upon the exercise of the option by the holder in all cases. Includes stock with put option held by ESOP and stock redeemable by holder only in the event of a change in control of the issuer.","units":{"shares":[{"end":"2009-12-31","val":25995000,"accn":"0001193125-11-249766","fy":2011,"fp":"Q2","form":"8-K","filed":"2011-09-16","frame":"CY2009Q4I"},{"end":"2010-12-31","val":26230000,"accn":"0001193125-12-132298","fy":2011,"fp":"FY","form":"10-K","filed":"2012-03-26","frame":"CY2010Q4I"},{"end":"2010-12-31","val":26230000,"accn":"0001193125-11-306964","fy":2011,"fp":"Q3","form":"10-Q","filed":"2011-11-10"},{"end":"2010-12-31","val":26230000,"accn":"0001193125-11-249766","fy":2011,"fp":"Q2","form":"8-K","filed":"2011-09-16"},{"end":"2010-12-31","val":26230000,"accn":"0001193125-11-218218","fy":2011,"fp":"Q2","form":"10-Q","filed":"2011-08-10"},{"end":"2011-06-30","val":10000000,"accn":"0001193125-11-249766","fy":2011,"fp":"Q2","form":"8-K","filed":"2011-09-16","frame":"CY2011Q2I"},{"end":"2011-06-30","val":10000000,"accn":"0001193125-11-218218","fy":2011,"fp":"Q2","form":"10-Q","filed":"2011-08-10"},{"end":"2011-09-30","val":10000000,"accn":"0001193125-11-306964","fy":2011,"fp":"Q3","form":"10-Q","filed":"2011-11-10","frame":"CY2011Q3I"},{"end":"2011-12-31","val":10000000,"accn":"0001193125-12-132298","fy":2011,"fp":"FY","form":"10-K","filed":"2012-03-26","frame":"CY2011Q4I"}]}},"TemporaryEquitySharesIssued":{"label":"Temporary Equity, Shares Issued","description":"The number of securities classified as temporary equity that have been sold (or granted) to the entity's shareholders. Securities issued include securities outstanding and securities held in treasury. Temporary equity is a security with redemption features that are outside the control of the issuer, is not classified as an asset or liability in conformity with GAAP, and is not mandatorily redeemable. Includes any type of security that is redeemable at a fixed or determinable price or on a fixed or determinable date or dates, is redeemable at the option of the holder, or has conditions for redemption which are not solely within the control of the issuer. If convertible, the issuer does not control the actions or events necessary to issue the maximum number of shares that could be required to be delivered under the conversion option if the holder exercises the option to convert the stock to another class of equity. If the security is a warrant or a rights issue, the warrant or rights issue is considered to be temporary equity if the issuer cannot demonstrate that it would be able to deliver upon the exercise of the option by the holder in all cases. Includes stock with put option held by ESOP and stock redeemable by holder only in the event of a change in control of the issuer.","units":{"shares":[{"end":"2009-12-31","val":25741000,"accn":"0001193125-11-249766","fy":2011,"fp":"Q2","form":"8-K","filed":"2011-09-16","frame":"CY2009Q4I"},{"end":"2010-12-31","val":26230000,"accn":"0001193125-12-132298","fy":2011,"fp":"FY","form":"10-K","filed":"2012-03-26","frame":"CY2010Q4I"},{"end":"2010-12-31","val":26230000,"accn":"0001193125-11-306964","fy":2011,"fp":"Q3","form":"10-Q","filed":"2011-11-10"},{"end":"2010-12-31","val":26230000,"accn":"0001193125-11-249766","fy":2011,"fp":"Q2","form":"8-K","filed":"2011-09-16"},{"end":"2010-12-31","val":26230000,"accn":"0001193125-11-218218","fy":2011,"fp":"Q2","form":"10-Q","filed":"2011-08-10"},{"end":"2011-06-30","val":0,"accn":"0001193125-11-249766","fy":2011,"fp":"Q2","form":"8-K","filed":"2011-09-16","frame":"CY2011Q2I"},{"end":"2011-06-30","val":0,"accn":"0001193125-11-218218","fy":2011,"fp":"Q2","form":"10-Q","filed":"2011-08-10"},{"end":"2011-09-30","val":0,"accn":"0001193125-11-306964","fy":2011,"fp":"Q3","form":"10-Q","filed":"2011-11-10","frame":"CY2011Q3I"},{"end":"2011-12-31","val":0,"accn":"0001193125-12-132298","fy":2011,"fp":"FY","form":"10-K","filed":"2012-03-26","frame":"CY2011Q4I"}]}},"UnamortizedDebtIssuanceExpense":{"label":"Unamortized Debt Issuance Expense","description":"The remaining balance of debt issuance expenses that were capitalized and are being amortized against income over the lives of the respective bond issues. This does not include the amounts capitalized as part of the cost of the utility plant or 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