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Estimated contributions may be presented in the aggregate combining (1) contributions required by funding regulations or laws, (2) discretionary contributions, and (3) noncash contributions.","units":{"USD":[{"end":"2011-12-31","val":5400000,"accn":"0001193125-12-343683","fy":2012,"fp":"Q2","form":"10-Q","filed":"2012-08-08","frame":"CY2011Q4I"},{"end":"2011-12-31","val":5400000,"accn":"0001193125-12-221763","fy":2012,"fp":"Q1","form":"10-Q","filed":"2012-05-09"},{"end":"2011-12-31","val":5400000,"accn":"0001193125-12-085100","fy":2011,"fp":"FY","form":"10-K","filed":"2012-02-28"}]}},"DefinedBenefitPlanExpectedFutureBenefitPaymentsInFiveFiscalYearsThereafter":{"label":"Defined Benefit Plan, Expected Future Benefit Payments in Five Fiscal Years Thereafter (Deprecated 2012-01-31)","description":"The amount of the aggregate benefits expected to be paid in the five fiscal years thereafter (the aggregate amount of benefits expected to be paid in years 6 through 10 after the date of the latest statement of financial position).","units":{"USD":[{"end":"2011-12-31","val":16137000,"accn":"0001193125-12-085100","fy":2011,"fp":"FY","form":"10-K","filed":"2012-02-28","frame":"CY2011Q4I"}]}},"DefinedBenefitPlanExpectedFutureBenefitPaymentsInYearFive":{"label":"Defined Benefit Plan, Expected Future Benefit Payments in Year Five (Deprecated 2012-01-31)","description":"The amount of the benefits expected to be paid in Year 5.","units":{"USD":[{"end":"2011-12-31","val":2349000,"accn":"0001193125-12-085100","fy":2011,"fp":"FY","form":"10-K","filed":"2012-02-28","frame":"CY2011Q4I"}]}},"DefinedBenefitPlanExpectedFutureBenefitPaymentsInYearFour":{"label":"Defined Benefit Plan, Expected Future Benefit Payments in Year Four (Deprecated 2012-01-31)","description":"The amount of the benefits expected to be paid in Year 4.","units":{"USD":[{"end":"2011-12-31","val":2096000,"accn":"0001193125-12-085100","fy":2011,"fp":"FY","form":"10-K","filed":"2012-02-28","frame":"CY2011Q4I"}]}},"DefinedBenefitPlanExpectedFutureBenefitPaymentsInYearOne":{"label":"Defined Benefit Plan, Expected Future Benefit Payments in Year One (Deprecated 2012-01-31)","description":"The amount of the benefits expected to be paid in Year 1.","units":{"USD":[{"end":"2011-12-31","val":1434000,"accn":"0001193125-12-085100","fy":2011,"fp":"FY","form":"10-K","filed":"2012-02-28","frame":"CY2011Q4I"}]}},"DefinedBenefitPlanExpectedFutureBenefitPaymentsInYearThree":{"label":"Defined Benefit Plan, Expected Future Benefit Payments in Year Three (Deprecated 2012-01-31)","description":"The amount of the benefits expected to be paid in Year 3.","units":{"USD":[{"end":"2011-12-31","val":1846000,"accn":"0001193125-12-085100","fy":2011,"fp":"FY","form":"10-K","filed":"2012-02-28","frame":"CY2011Q4I"}]}},"DefinedBenefitPlanExpectedFutureBenefitPaymentsInYearTwo":{"label":"Defined Benefit Plan, Expected Future Benefit Payments in Year Two (Deprecated 2012-01-31)","description":"The amount of the benefits expected to be paid in Year 2.","units":{"USD":[{"end":"2011-12-31","val":1638000,"accn":"0001193125-12-085100","fy":2011,"fp":"FY","form":"10-K","filed":"2012-02-28","frame":"CY2011Q4I"}]}},"DefinedBenefitPlanExpectedReturnOnPlanAssets":{"label":"Defined Benefit Plan, Expected Return (Loss) on Plan Assets","description":"Amount of expected return (loss) recognized in net periodic benefit (cost) credit, calculated based on expected long-term rate of return and market-related value of plan assets of defined benefit plan.","units":{"USD":[{"start":"2009-01-01","end":"2009-12-31","val":2518000,"accn":"0001193125-12-085100","fy":2011,"fp":"FY","form":"10-K","filed":"2012-02-28","frame":"CY2009"},{"start":"2010-01-01","end":"2010-12-31","val":3270000,"accn":"0001193125-12-085100","fy":2011,"fp":"FY","form":"10-K","filed":"2012-02-28","frame":"CY2010"},{"start":"2011-01-02","end":"2011-06-30","val":1945000,"accn":"0001193125-12-343683","fy":2012,"fp":"Q2","form":"10-Q","filed":"2012-08-08"},{"start":"2011-04-01","end":"2011-06-30","val":973000,"accn":"0001193125-12-343683","fy":2012,"fp":"Q2","form":"10-Q","filed":"2012-08-08","frame":"CY2011Q2"},{"start":"2011-01-01","end":"2011-12-31","val":3877000,"accn":"0001193125-12-085100","fy":2011,"fp":"FY","form":"10-K","filed":"2012-02-28","frame":"CY2011"},{"start":"2012-01-01","end":"2012-06-30","val":1912000,"accn":"0001193125-12-343683","fy":2012,"fp":"Q2","form":"10-Q","filed":"2012-08-08"},{"start":"2012-04-03","end":"2012-06-30","val":956000,"accn":"0001193125-12-343683","fy":2012,"fp":"Q2","form":"10-Q","filed":"2012-08-08","frame":"CY2012Q2"}]}},"DefinedBenefitPlanFairValueOfPlanAssets":{"label":"Defined Benefit Plan, Plan Assets, Amount","description":"Amount of asset segregated and restricted to provide benefit under defined benefit plan. 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to Acquire Businesses, Net of Cash Acquired","description":"The cash outflow associated with the acquisition of a business, net of the cash acquired from the purchase.","units":{"USD":[{"start":"2015-01-01","end":"2015-03-31","val":28078000,"accn":"0001104659-16-119586","fy":2016,"fp":"Q1","form":"10-Q","filed":"2016-05-10","frame":"CY2015Q1"},{"start":"2015-01-01","end":"2015-06-30","val":28078000,"accn":"0001104659-16-137457","fy":2016,"fp":"Q2","form":"10-Q","filed":"2016-08-05"},{"start":"2015-01-01","end":"2015-09-30","val":74953000,"accn":"0001104659-15-076680","fy":2015,"fp":"Q3","form":"10-Q","filed":"2015-11-06"},{"start":"2015-01-01","end":"2015-09-30","val":74953000,"accn":"0001558370-16-009638","fy":2016,"fp":"Q3","form":"10-Q","filed":"2016-11-08"},{"start":"2015-01-01","end":"2015-12-31","val":74953000,"accn":"0001104659-16-100443","fy":2015,"fp":"FY","form":"10-K","filed":"2016-02-26"},{"start":"2015-01-01","end":"2015-12-31","val":74953000,"accn":"0001558370-17-000985","fy":2016,"fp":"FY","form":"10-K","filed":"2017-02-24"},{"start":"2015-01-01","end":"2015-12-31","val":74953000,"accn":"0001558370-18-000988","fy":2017,"fp":"FY","form":"10-K","filed":"2018-02-23","frame":"CY2015"},{"start":"2016-01-01","end":"2016-09-30","val":1011000,"accn":"0001558370-16-009638","fy":2016,"fp":"Q3","form":"10-Q","filed":"2016-11-08"},{"start":"2016-01-01","end":"2016-09-30","val":1011000,"accn":"0001558370-17-008218","fy":2017,"fp":"Q3","form":"10-Q","filed":"2017-11-06"},{"start":"2016-01-01","end":"2016-12-31","val":1011000,"accn":"0001558370-17-000985","fy":2016,"fp":"FY","form":"10-K","filed":"2017-02-24"},{"start":"2016-01-01","end":"2016-12-31","val":1011000,"accn":"0001558370-18-000988","fy":2017,"fp":"FY","form":"10-K","filed":"2018-02-23","frame":"CY2016"}]}},"PaymentsToAcquireEquityMethodInvestments":{"label":"Payments to Acquire Equity Method Investments","description":"The cash outflow associated with the purchase of or advances to an equity method investments, which are investments in joint ventures and entities in which the entity has an equity ownership interest normally of 20 to 50 percent and exercises significant influence.","units":{"USD":[{"start":"2011-01-01","end":"2011-09-30","val":35700000,"accn":"0001193125-11-301471","fy":2011,"fp":"Q3","form":"10-Q","filed":"2011-11-08"},{"start":"2011-01-01","end":"2011-12-31","val":42700000,"accn":"0001193125-12-085100","fy":2011,"fp":"FY","form":"10-K","filed":"2012-02-28","frame":"CY2011"}]}},"PaymentsToAcquireIntangibleAssets":{"label":"Payments to Acquire Intangible Assets","description":"The cash outflow to acquire asset without physical form usually arising from contractual or other legal rights, excluding goodwill.","units":{"USD":[{"start":"2014-01-01","end":"2014-12-31","val":11687000,"accn":"0001104659-15-014982","fy":2014,"fp":"FY","form":"10-K","filed":"2015-02-27"},{"start":"2014-01-01","end":"2014-12-31","val":11687000,"accn":"0001104659-16-100443","fy":2015,"fp":"FY","form":"10-K","filed":"2016-02-26"},{"start":"2014-01-01","end":"2014-12-31","val":11687000,"accn":"0001558370-17-000985","fy":2016,"fp":"FY","form":"10-K","filed":"2017-02-24","frame":"CY2014"},{"start":"2016-01-01","end":"2016-09-30","val":23000000,"accn":"0001558370-16-009638","fy":2016,"fp":"Q3","form":"10-Q","filed":"2016-11-08"},{"start":"2016-01-01","end":"2016-09-30","val":23000000,"accn":"0001558370-17-008218","fy":2017,"fp":"Q3","form":"10-Q","filed":"2017-11-06"},{"start":"2016-01-01","end":"2016-12-31","val":23000000,"accn":"0001558370-17-000985","fy":2016,"fp":"FY","form":"10-K","filed":"2017-02-24"},{"start":"2016-01-01","end":"2016-12-31","val":23000000,"accn":"0001558370-18-000988","fy":2017,"fp":"FY","form":"10-K","filed":"2018-02-23","frame":"CY2016"}]}},"PaymentsToAcquireInterestInSubsidiariesAndAffiliates":{"label":"Payments to Acquire Interest in Subsidiaries and Affiliates","description":"The cash outflow associated with the acquisition of or advances to an entity that is related to it but not strictly controlled (for example, an unconsolidated subsidiary, affiliate, and joint venture or equity method investment) or the acquisition of an additional interest in a subsidiary (controlled entity).","units":{"USD":[{"start":"2011-01-01","end":"2011-09-30","val":35700000,"accn":"0001104659-12-075783","fy":2012,"fp":"Q3","form":"10-Q","filed":"2012-11-08"},{"start":"2011-01-01","end":"2011-12-31","val":42700000,"accn":"0001047469-13-002044","fy":2012,"fp":"FY","form":"10-K","filed":"2013-03-01"},{"start":"2011-01-01","end":"2011-12-31","val":42700000,"accn":"0001104659-14-014607","fy":2013,"fp":"FY","form":"10-K","filed":"2014-02-28","frame":"CY2011"},{"start":"2012-01-01","end":"2012-03-31","val":4400000,"accn":"0001193125-12-221763","fy":2012,"fp":"Q1","form":"10-Q","filed":"2012-05-09"},{"start":"2012-01-01","end":"2012-03-31","val":4400000,"accn":"0001104659-13-039350","fy":2013,"fp":"Q1","form":"10-Q","filed":"2013-05-09","frame":"CY2012Q1"},{"start":"2012-01-01","end":"2012-06-30","val":30600000,"accn":"0001193125-12-343683","fy":2012,"fp":"Q2","form":"10-Q","filed":"2012-08-08"},{"start":"2012-01-01","end":"2012-06-30","val":30600000,"accn":"0001104659-13-061563","fy":2013,"fp":"Q2","form":"10-Q","filed":"2013-08-08"},{"start":"2012-01-01","end":"2012-09-30","val":43100000,"accn":"0001104659-12-075783","fy":2012,"fp":"Q3","form":"10-Q","filed":"2012-11-08"},{"start":"2012-01-01","end":"2012-09-30","val":43100000,"accn":"0001104659-13-082135","fy":2013,"fp":"Q3","form":"10-Q","filed":"2013-11-07"},{"start":"2012-01-01","end":"2012-12-31","val":59800000,"accn":"0001047469-13-002044","fy":2012,"fp":"FY","form":"10-K","filed":"2013-03-01"},{"start":"2012-01-01","end":"2012-12-31","val":59800000,"accn":"0001104659-14-014607","fy":2013,"fp":"FY","form":"10-K","filed":"2014-02-28"},{"start":"2012-01-01","end":"2012-12-31","val":59800000,"accn":"0001104659-15-014982","fy":2014,"fp":"FY","form":"10-K","filed":"2015-02-27","frame":"CY2012"},{"start":"2013-01-01","end":"2013-03-31","val":29700000,"accn":"0001104659-13-039350","fy":2013,"fp":"Q1","form":"10-Q","filed":"2013-05-09"},{"start":"2013-01-01","end":"2013-03-31","val":29700000,"accn":"0001104659-14-036903","fy":2014,"fp":"Q1","form":"10-Q","filed":"2014-05-09","frame":"CY2013Q1"},{"start":"2013-01-01","end":"2013-06-30","val":47500000,"accn":"0001104659-13-061563","fy":2013,"fp":"Q2","form":"10-Q","filed":"2013-08-08"},{"start":"2013-01-01","end":"2013-06-30","val":47500000,"accn":"0001104659-14-058846","fy":2014,"fp":"Q2","form":"10-Q","filed":"2014-08-08"},{"start":"2013-01-01","end":"2013-09-30","val":47500000,"accn":"0001104659-13-082135","fy":2013,"fp":"Q3","form":"10-Q","filed":"2013-11-07"},{"start":"2013-01-01","end":"2013-09-30","val":47500000,"accn":"0001104659-14-078151","fy":2014,"fp":"Q3","form":"10-Q","filed":"2014-11-07"},{"start":"2013-01-01","end":"2013-12-31","val":62500000,"accn":"0001104659-14-014607","fy":2013,"fp":"FY","form":"10-K","filed":"2014-02-28"},{"start":"2013-01-01","end":"2013-12-31","val":62500000,"accn":"0001104659-15-014982","fy":2014,"fp":"FY","form":"10-K","filed":"2015-02-27"},{"start":"2013-01-01","end":"2013-12-31","val":62500000,"accn":"0001104659-16-100443","fy":2015,"fp":"FY","form":"10-K","filed":"2016-02-26","frame":"CY2013"},{"start":"2014-01-01","end":"2014-03-31","val":30000000,"accn":"0001104659-14-036903","fy":2014,"fp":"Q1","form":"10-Q","filed":"2014-05-09"},{"start":"2014-01-01","end":"2014-03-31","val":30000000,"accn":"0001104659-15-036100","fy":2015,"fp":"Q1","form":"10-Q","filed":"2015-05-08","frame":"CY2014Q1"},{"start":"2014-01-01","end":"2014-06-30","val":60000000,"accn":"0001104659-14-058846","fy":2014,"fp":"Q2","form":"10-Q","filed":"2014-08-08"},{"start":"2014-01-01","end":"2014-06-30","val":60000000,"accn":"0001104659-15-057246","fy":2015,"fp":"Q2","form":"10-Q","filed":"2015-08-06"},{"start":"2014-01-01","end":"2014-09-30","val":85250000,"accn":"0001104659-14-078151","fy":2014,"fp":"Q3","form":"10-Q","filed":"2014-11-07"},{"start":"2014-01-01","end":"2014-09-30","val":85250000,"accn":"0001104659-15-076680","fy":2015,"fp":"Q3","form":"10-Q","filed":"2015-11-06"},{"start":"2014-01-01","end":"2014-12-31","val":111376000,"accn":"0001104659-15-014982","fy":2014,"fp":"FY","form":"10-K","filed":"2015-02-27"},{"start":"2014-01-01","end":"2014-12-31","val":111376000,"accn":"0001104659-16-100443","fy":2015,"fp":"FY","form":"10-K","filed":"2016-02-26"},{"start":"2014-01-01","end":"2014-12-31","val":111376000,"accn":"0001558370-17-000985","fy":2016,"fp":"FY","form":"10-K","filed":"2017-02-24","frame":"CY2014"},{"start":"2015-01-01","end":"2015-03-31","val":18804000,"accn":"0001104659-15-036100","fy":2015,"fp":"Q1","form":"10-Q","filed":"2015-05-08"},{"start":"2015-01-01","end":"2015-03-31","val":18804000,"accn":"0001104659-16-119586","fy":2016,"fp":"Q1","form":"10-Q","filed":"2016-05-10","frame":"CY2015Q1"},{"start":"2015-01-01","end":"2015-06-30","val":30757000,"accn":"0001104659-15-057246","fy":2015,"fp":"Q2","form":"10-Q","filed":"2015-08-06"},{"start":"2015-01-01","end":"2015-06-30","val":30757000,"accn":"0001104659-16-137457","fy":2016,"fp":"Q2","form":"10-Q","filed":"2016-08-05"},{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to Acquire Long-term Investments","description":"The cash outflow for securities or other assets acquired, which qualify for treatment as an investing activity and are to be liquidated, if necessary, beyond the current operating cycle. Includes cash flows from securities classified as trading securities that were acquired for reasons other than sale in the long-term.","units":{"USD":[{"start":"2017-01-01","end":"2017-09-30","val":100000000,"accn":"0001558370-17-008218","fy":2017,"fp":"Q3","form":"10-Q","filed":"2017-11-06"},{"start":"2017-01-01","end":"2017-12-31","val":100000000,"accn":"0001558370-18-000988","fy":2017,"fp":"FY","form":"10-K","filed":"2018-02-23","frame":"CY2017"}]}},"PaymentsToAcquireMarketableSecurities":{"label":"Payments to Acquire Marketable Securities","description":"Amount of cash outflow for purchase of marketable security.","units":{"USD":[{"start":"2009-01-01","end":"2009-12-31","val":4527000,"accn":"0001193125-12-085100","fy":2011,"fp":"FY","form":"10-K","filed":"2012-02-28","frame":"CY2009"}]}},"PaymentsToAcquireMineralRights":{"label":"Payments to Acquire Mineral Rights","description":"The cash outflow from the acquisition of a mineral right which is the right to extract a mineral from the earth or to receive payment, in the form of royalty, for the extraction of 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Examples include land, buildings, machinery and equipment, and other types of furniture and equipment including, but not limited to, office equipment, furniture and fixtures, and computer equipment and software.","units":{"pure":[{"start":"2011-01-01","end":"2011-12-31","val":20,"accn":"0001193125-12-085100","fy":2011,"fp":"FY","form":"10-K","filed":"2012-02-28","frame":"CY2011"}]}},"PropertyPlantAndEquipmentUsefulLifeMinimum":{"label":"Property, Plant and Equipment, Useful Life, Minimum (Deprecated 2012-01-31)","description":"The minimum useful life of long lived, physical assets used in the normal conduct of business and not intended for resale. 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