Discontinued Operations (Details) (USD $)	6 Months Ended		3 Months Ended	0 Months Ended	6 Months Ended
	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2014 Discontinued Operations [Member]	Apr. 30, 2014 Edison Mission Energy	Jun. 30, 2014 Edison Mission Energy installments	Apr. 01, 2014 Edison Mission Energy	Dec. 31, 2013 Edison Mission Energy	Jun. 30, 2014 Edison Mission Energy Maximum
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Liabilities For Joint Tax and Qualified Retirement Plans Resulting from Deconsolidation						$ 342,000,000
Percentage of Tax Benefits To Be Paid					50.00%
Tax Attributes Estimated Amount							1,191,000,000
Cash Portion of Settlement Payment	225,000,000	0		225,000,000
Number of Installments					2
Interest Rate On Installments					5.00%
Tax Attribute Including Interest, Installment One					199,000,000
Tax Attribute Including Interest Installment Two					210,000,000
Variance, Initial Estimate, Tax Attribute								10.00%
Amount Required for Escrow						50,000,000
Nondebtor Reorganization Items, Net (Gain) Loss on Settlement of Other Claims			$ 184,000,000