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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 |  |  |  |  |

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