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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 |  |

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