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Discontinued Operations (Details) (USD $) In Millions, unless otherwise specified | 9 Months Ended | 1 Months Ended | 9 Months Ended |  |  |  | 3 Months Ended | 9 Months Ended
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Sep. 30, 2014 | Sep. 30, 2013 | Apr. 30, 2014 Edison Mission Energy | Sep. 30, 2014 Edison Mission Energy installment | Aug. 31, 2014 Edison Mission Energy | Apr. 01, 2014 Edison Mission Energy | Dec. 31, 2013 Edison Mission Energy | Sep. 30, 2014 Edison Mission Energy Discontinued Operations | Sep. 30, 2014 Edison Mission Energy Discontinued Operations
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 |  |  |
Percentage of Tax Benefits To Be Paid |  |  |  | 50.00% |  |  |  |  |
Tax Attributes Estimated Amount |  |  |  |  |  |  | 1,191 |  |
Cash Portion of Settlement Payment | 225 | 0 | 225 |  |  |  |  |  |
Tax Attributes |  |  |  |  | 1,206 |  |  |  |
Number of Installments |  |  |  | 2 |  |  |  |  |
Tax Attribute Including Interest, Installment One |  |  |  | 204 |  |  |  |  |
Tax Attribute Including Interest Installment Two |  |  |  | 214 |  |  |  |  |
Gain (Loss) Related to EME Settlement |  |  |  |  |  |  |  | $ (16) | $ 168

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