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This item includes treasury stock repurchased by the entity. Note: elements for number of nonredeemable common shares, par value and other disclosure concepts are in another section within stockholders' 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Plant and Equipment, Other, Gross","description":"Amount before accumulated depreciation, depletion and amortization of other physical assets used in the normal conduct of business to produce goods and services and not intended for resale.","units":{"USD":[{"end":"2009-12-31","val":142899000,"accn":"0001193125-11-050000","fy":2010,"fp":"FY","form":"10-K","filed":"2011-02-28","frame":"CY2009Q4I"},{"end":"2010-12-31","val":175830000,"accn":"0001193125-12-086972","fy":2011,"fp":"FY","form":"10-K","filed":"2012-02-29","frame":"CY2010Q4I"},{"end":"2010-12-31","val":175830000,"accn":"0001193125-11-050000","fy":2010,"fp":"FY","form":"10-K","filed":"2011-02-28"},{"end":"2011-12-31","val":169998000,"accn":"0001193125-12-086972","fy":2011,"fp":"FY","form":"10-K","filed":"2012-02-29","frame":"CY2011Q4I"}]}},"PropertyPlantAndEquipmentUsefulLifeMaximum":{"label":"Property, Plant and Equipment, Useful Life, Maximum (Deprecated 2012-01-31)","description":"The maximum useful life of long-lived, physical assets used in the normal conduct of business and not intended for resale. 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":"2010-01-01","end":"2010-12-31","val":5,"accn":"0001193125-11-050000","fy":2010,"fp":"FY","form":"10-K","filed":"2011-02-28","frame":"CY2010"}],"years":[{"start":"2011-01-01","end":"2011-12-31","val":5,"accn":"0001193125-12-086972","fy":2011,"fp":"FY","form":"10-K","filed":"2012-02-29","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. 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":"2010-01-01","end":"2010-12-31","val":2,"accn":"0001193125-11-050000","fy":2010,"fp":"FY","form":"10-K","filed":"2011-02-28","frame":"CY2010"}],"years":[{"start":"2011-01-01","end":"2011-12-31","val":2,"accn":"0001193125-12-086972","fy":2011,"fp":"FY","form":"10-K","filed":"2012-02-29","frame":"CY2011"}]}},"ReclassificationFromAccumulatedOtherComprehensiveIncomeCurrentPeriodNetOfTax":{"label":"Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax","description":"Amount after tax of reclassification adjustments of other comprehensive income (loss).","units":{"USD":[{"start":"2014-01-01","end":"2014-12-31","val":-57778000,"accn":"0001193125-17-065791","fy":2016,"fp":"FY","form":"10-K","filed":"2017-03-01","frame":"CY2014"},{"start":"2015-01-01","end":"2015-09-30","val":3081000,"accn":"0001193125-16-764376","fy":2016,"fp":"Q3","form":"10-Q","filed":"2016-11-09"},{"start":"2015-07-01","end":"2015-09-30","val":941000,"accn":"0001193125-16-764376","fy":2016,"fp":"Q3","form":"10-Q","filed":"2016-11-09","frame":"CY2015Q3"},{"start":"2015-01-01","end":"2015-12-31","val":4595000,"accn":"0001193125-17-065791","fy":2016,"fp":"FY","form":"10-K","filed":"2017-03-01","frame":"CY2015"},{"start":"2016-01-01","end":"2016-03-31","val":703000,"accn":"0001193125-17-164173","fy":2017,"fp":"Q1","form":"10-Q","filed":"2017-05-09","frame":"CY2016Q1"},{"start":"2016-01-01","end":"2016-09-30","val":-15887000,"accn":"0001193125-16-764376","fy":2016,"fp":"Q3","form":"10-Q","filed":"2016-11-09"},{"start":"2016-07-01","end":"2016-09-30","val":-1014000,"accn":"0001193125-16-764376","fy":2016,"fp":"Q3","form":"10-Q","filed":"2016-11-09","frame":"CY2016Q3"},{"start":"2016-01-01","end":"2016-12-31","val":-15615000,"accn":"0001193125-17-065791","fy":2016,"fp":"FY","form":"10-K","filed":"2017-03-01","frame":"CY2016"},{"start":"2017-01-01","end":"2017-03-31","val":-315000,"accn":"0001193125-17-164173","fy":2017,"fp":"Q1","form":"10-Q","filed":"2017-05-09","frame":"CY2017Q1"}]}},"ReductionOfShortTermCapitalLeaseObligations":{"label":"Reduction 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tenants.","units":{"USD":[{"start":"2010-01-01","end":"2010-03-31","val":43000000,"accn":"0001193125-12-086972","fy":2011,"fp":"FY","form":"10-K","filed":"2012-02-29","frame":"CY2010Q1"},{"start":"2010-01-01","end":"2010-03-31","val":43000000,"accn":"0001193125-11-050000","fy":2010,"fp":"FY","form":"10-K","filed":"2011-02-28"},{"start":"2010-01-01","end":"2010-06-30","val":42000000,"accn":"0001193125-10-183175","fy":2010,"fp":"Q2","form":"10-Q","filed":"2010-08-09"},{"start":"2010-04-01","end":"2010-06-30","val":18000000,"accn":"0001193125-10-183175","fy":2010,"fp":"Q2","form":"10-Q","filed":"2010-08-09","frame":"CY2010Q2"},{"start":"2011-01-01","end":"2011-03-31","val":11000000,"accn":"0001193125-12-222082","fy":2012,"fp":"Q1","form":"10-Q","filed":"2012-05-09","frame":"CY2011Q1"}]}},"RelatedPartyTransactionDueFromToRelatedParty":{"label":"Related Party Transaction, Due from (to) Related Party","description":"Receivables to be collected from (obligations owed to) related parties, net as of the balance sheet date where one party can exercise control or significant influence over another party; including affiliates, owners or officers and their immediate families, pension trusts, and so forth.","units":{"USD":[{"end":"2016-12-31","val":46000000,"accn":"0001193125-17-164173","fy":2017,"fp":"Q1","form":"10-Q","filed":"2017-05-09","frame":"CY2016Q4I"},{"end":"2017-03-31","val":46000000,"accn":"0001193125-17-164173","fy":2017,"fp":"Q1","form":"10-Q","filed":"2017-05-09","frame":"CY2017Q1I"}]}},"RepaymentsOfLinesOfCredit":{"label":"Repayments of Lines of Credit","description":"Amount of cash outflow for payment of an obligation from a lender, including but not limited to, letter of credit, standby letter of credit and revolving credit 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Alternate caption for the concept is permanent 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