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Examples include, but are not limited to, land, buildings, machinery and equipment, office equipment, furniture and fixtures, and computer equipment.","units":{"USD":[{"start":"2014-01-01","end":"2014-12-31","val":236000000,"accn":"0001144204-17-009606","fy":2016,"fp":"FY","form":"10-K","filed":"2017-02-16","frame":"CY2014"},{"start":"2015-01-01","end":"2015-06-30","val":104300000,"accn":"0001144204-16-115104","fy":2016,"fp":"Q2","form":"10-Q","filed":"2016-07-29"},{"start":"2015-01-01","end":"2015-09-30","val":147400000,"accn":"0001144204-16-130392","fy":2016,"fp":"Q3","form":"10-Q","filed":"2016-10-31"},{"start":"2015-01-01","end":"2015-12-31","val":178500000,"accn":"0001144204-17-009606","fy":2016,"fp":"FY","form":"10-K","filed":"2017-02-16","frame":"CY2015"},{"start":"2016-01-01","end":"2016-06-30","val":28500000,"accn":"0001144204-16-115104","fy":2016,"fp":"Q2","form":"10-Q","filed":"2016-07-29"},{"start":"2016-01-01","end":"2016-09-30","val":41200000,"accn":"0001144204-16-130392","fy":2016,"fp":"Q3","form":"10-Q","filed":"2016-10-31"},{"start":"2016-01-01","end":"2016-12-31","val":56100000,"accn":"0001144204-17-009606","fy":2016,"fp":"FY","form":"10-K","filed":"2017-02-16","frame":"CY2016"}]}},"PropertyPlantAndEquipmentNet":{"label":"Property, Plant and Equipment, Net","description":"Amount after accumulated depreciation, depletion and amortization of physical assets used in the normal conduct of business to produce goods and services and not intended for resale. Examples include, but are not limited to, land, buildings, machinery and equipment, office equipment, and furniture and fixtures.","units":{"USD":[{"end":"2012-12-31","val":3963000000,"accn":"0001193125-13-480907","fy":2013,"fp":"Q3","form":"10-Q","filed":"2013-12-20"},{"end":"2012-12-31","val":3963000000,"accn":"0001193125-14-056476","fy":2013,"fp":"FY","form":"10-K","filed":"2014-02-18","frame":"CY2012Q4I"},{"end":"2013-09-30","val":4058300000,"accn":"0001193125-13-480907","fy":2013,"fp":"Q3","form":"10-Q","filed":"2013-12-20","frame":"CY2013Q3I"},{"end":"2013-12-31","val":4082300000,"accn":"0001193125-14-056476","fy":2013,"fp":"FY","form":"10-K","filed":"2014-02-18"},{"end":"2013-12-31","val":4082300000,"accn":"0001193125-14-177909","fy":2014,"fp":"Q1","form":"10-Q","filed":"2014-05-02"},{"end":"2013-12-31","val":4082300000,"accn":"0001193125-14-290142","fy":2014,"fp":"Q2","form":"10-Q","filed":"2014-08-01"},{"end":"2013-12-31","val":4082300000,"accn":"0001193125-14-392306","fy":2014,"fp":"Q3","form":"10-Q","filed":"2014-11-03"},{"end":"2013-12-31","val":4082300000,"accn":"0001193125-15-050959","fy":2014,"fp":"FY","form":"10-K","filed":"2015-02-18","frame":"CY2013Q4I"},{"end":"2014-03-31","val":4102000000,"accn":"0001193125-14-177909","fy":2014,"fp":"Q1","form":"10-Q","filed":"2014-05-02","frame":"CY2014Q1I"},{"end":"2014-06-30","val":4118200000,"accn":"0001193125-14-290142","fy":2014,"fp":"Q2","form":"10-Q","filed":"2014-08-01","frame":"CY2014Q2I"},{"end":"2014-09-30","val":4135800000,"accn":"0001193125-14-392306","fy":2014,"fp":"Q3","form":"10-Q","filed":"2014-11-03","frame":"CY2014Q3I"},{"end":"2014-12-31","val":4159700000,"accn":"0001193125-15-050959","fy":2014,"fp":"FY","form":"10-K","filed":"2015-02-18"},{"end":"2014-12-31","val":4159700000,"accn":"0001193125-15-165736","fy":2015,"fp":"Q1","form":"10-Q","filed":"2015-05-01"},{"end":"2014-12-31","val":4159700000,"accn":"0001144204-15-045325","fy":2015,"fp":"Q2","form":"10-Q","filed":"2015-07-31"},{"end":"2014-12-31","val":4159700000,"accn":"0001144204-15-061977","fy":2015,"fp":"Q3","form":"10-Q","filed":"2015-10-30"},{"end":"2014-12-31","val":4159700000,"accn":"0001144204-16-083002","fy":2015,"fp":"FY","form":"10-K","filed":"2016-02-17","frame":"CY2014Q4I"},{"end":"2015-03-31","val":4232400000,"accn":"0001193125-15-165736","fy":2015,"fp":"Q1","form":"10-Q","filed":"2015-05-01","frame":"CY2015Q1I"},{"end":"2015-06-30","val":4218400000,"accn":"0001144204-15-045325","fy":2015,"fp":"Q2","form":"10-Q","filed":"2015-07-31","frame":"CY2015Q2I"},{"end":"2015-09-30","val":4222700000,"accn":"0001144204-15-061977","fy":2015,"fp":"Q3","form":"10-Q","filed":"2015-10-30","frame":"CY2015Q3I"},{"end":"2015-12-31","val":4226300000,"accn":"0001144204-16-083002","fy":2015,"fp":"FY","form":"10-K","filed":"2016-02-17"},{"end":"2015-12-31","val":4226300000,"accn":"0001144204-16-098095","fy":2016,"fp":"Q1","form":"10-Q","filed":"2016-05-02"},{"end":"2015-12-31","val":4226300000,"accn":"0001144204-16-115104","fy":2016,"fp":"Q2","form":"10-Q","filed":"2016-07-29"},{"end":"2015-12-31","val":4226300000,"accn":"0001144204-16-130392","fy":2016,"fp":"Q3","form":"10-Q","filed":"2016-10-31"},{"end":"2015-12-31","val":4226300000,"accn":"0001144204-17-009606","fy":2016,"fp":"FY","form":"10-K","filed":"2017-02-16","frame":"CY2015Q4I"},{"end":"2016-03-31","val":4207500000,"accn":"0001144204-16-098095","fy":2016,"fp":"Q1","form":"10-Q","filed":"2016-05-02","frame":"CY2016Q1I"},{"end":"2016-06-30","val":4157000000,"accn":"0001144204-16-115104","fy":2016,"fp":"Q2","form":"10-Q","filed":"2016-07-29","frame":"CY2016Q2I"},{"end":"2016-09-30","val":4133000000,"accn":"0001144204-16-130392","fy":2016,"fp":"Q3","form":"10-Q","filed":"2016-10-31","frame":"CY2016Q3I"},{"end":"2016-12-31","val":4114500000,"accn":"0001144204-17-009606","fy":2016,"fp":"FY","form":"10-K","filed":"2017-02-16","frame":"CY2016Q4I"}]}},"PublicUtilitiesApprovedDebtCapitalStructurePercentage":{"label":"Public 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Includes, but is not limited to, recorded and unrecorded purchase obligations, long-term purchase commitment, and short-term purchase commitment. Excludes interim and annual periods when interim periods are reported from current statement of financial position date (rolling approach).","units":{"USD":[{"end":"2013-12-31","val":1030200000,"accn":"0001193125-14-056476","fy":2013,"fp":"FY","form":"10-K","filed":"2014-02-18","frame":"CY2013Q4I"}]}},"PurchaseObligationDueInFifthYear":{"label":"Purchase Obligation, to be Paid, Year Five","description":"Amount of purchase arrangement to be paid in fifth fiscal year following current fiscal year. Includes, but is not limited to, recorded and unrecorded purchase obligations, long-term purchase commitment, and short-term purchase commitment. Excludes interim and annual periods when interim periods are reported from current statement of financial position date (rolling approach).","units":{"USD":[{"end":"2013-12-31","val":204100000,"accn":"0001193125-14-056476","fy":2013,"fp":"FY","form":"10-K","filed":"2014-02-18","frame":"CY2013Q4I"}]}},"PurchaseObligationDueInFourthYear":{"label":"Purchase Obligation, to be Paid, Year Four","description":"Amount of purchase arrangement to be paid in fourth fiscal year following current fiscal year. Includes, but is not limited to, recorded and unrecorded purchase obligations, long-term purchase commitment, and short-term purchase commitment. Excludes interim and annual periods when interim periods are reported from current statement of financial position date (rolling approach).","units":{"USD":[{"end":"2013-12-31","val":190600000,"accn":"0001193125-14-056476","fy":2013,"fp":"FY","form":"10-K","filed":"2014-02-18","frame":"CY2013Q4I"}]}},"PurchaseObligationDueInNextTwelveMonths":{"label":"Purchase Obligation, to be Paid, Year One","description":"Amount of purchase arrangement to be paid in next fiscal year following current fiscal year. Includes, but is not limited to, recorded and unrecorded purchase obligations, long-term purchase commitment, and short-term purchase commitment. Excludes interim and annual periods when interim periods are reported from current statement of financial position date (rolling approach).","units":{"USD":[{"end":"2013-12-31","val":279700000,"accn":"0001193125-14-056476","fy":2013,"fp":"FY","form":"10-K","filed":"2014-02-18","frame":"CY2013Q4I"}]}},"PurchaseObligationDueInSecondYear":{"label":"Purchase Obligation, to be Paid, Year Two","description":"Amount of purchase arrangement to be paid in second fiscal year following current fiscal year. Includes, but is not limited to, recorded and unrecorded purchase obligations, long-term purchase commitment, and short-term purchase commitment. Excludes interim and annual periods when interim periods are reported from current statement of financial position date (rolling approach).","units":{"USD":[{"end":"2013-12-31","val":152300000,"accn":"0001193125-14-056476","fy":2013,"fp":"FY","form":"10-K","filed":"2014-02-18","frame":"CY2013Q4I"}]}},"PurchaseObligationDueInThirdYear":{"label":"Purchase Obligation, to be Paid, Year Three","description":"Amount of purchase arrangement to be paid in third fiscal year following current fiscal year. Includes, but is not limited to, recorded and unrecorded purchase obligations, long-term purchase commitment, and short-term purchase commitment. Excludes interim and annual periods when interim periods are reported from current statement of financial position date (rolling approach).","units":{"USD":[{"end":"2013-12-31","val":141100000,"accn":"0001193125-14-056476","fy":2013,"fp":"FY","form":"10-K","filed":"2014-02-18","frame":"CY2013Q4I"}]}},"QualitativeAndQuantitativeInformationAssetsOrLiabilitiesForTransferorsContinuingInvolvementInSecuritizationOrAssetbackedFinancingArrangementPrincipalAmountsOutstanding":{"label":"Qualitative and Quantitative Information, Transferor's Continuing Involvement, Principal Amount Outstanding (Deprecated 2014-01-31)","description":"The total principal outstanding of financial assets transferred in a securitization, asset-backed financing arrangement, or similar transfer that has been accounted for as sales and in which the transferor continues to have involvement, including both the derecognized and recognized portion of such transferred 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