Discontinued Operations (Textual) (Details) (USD $)			3 Months Ended			12 Months Ended	3 Months Ended	12 Months Ended		0 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2012 Homer City	Sep. 30, 2012 Homer City	Dec. 31, 2011 Homer City	Dec. 31, 2013 Homer City	Dec. 31, 2012 Edison International	Dec. 31, 2013 Edison Mission Energy	Dec. 31, 2012 Edison Mission Energy	Feb. 18, 2014 Subsequent Event [Member] Edison Mission Energy installments
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Impairment and other charges, after tax							$ 1,300,000,000
Impairment and other charges			89,000,000	113,000,000	1,030,000,000
Impairment and other charges, net of tax			53,000,000	68,000,000
Liabilities for tax and pension related to deconsolidation								325,000,000		350,000,000
Retirement liabilities for EME employees	1,378,000,000	2,614,000,000						35,000,000	80,000,000
Joint Tax Liability								290,000,000
Estimated loss under plan support agreement						150,000,000
Percentage of Tax Benefits To Be Paid										50.00%
Tax Attributes Amount										1,191,000,000
Estimated Period for Updating Procedure										6 months
Cash Portion of Settlement Payment										225,000,000
Number of Installments										2
Interest rate on installments										5.00%
Installment one, tax attribute settlement										199,000,000
Installment two, tax attribute settlement										210,000,000
Amount required for escrow										50,000,000
Estimated amount that tax benefits will exceed recorded liabilities										200,000,000
Estimated settlement income										130,000,000
Deferred tax assets net of valuation allowance	3,074,000,000	2,667,000,000								220,000,000
Provision for losses										150,000,000
Impact of deconsolidation on current earnings								$ 70,000,000