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Discontinued Operations (Details) (USD $) In Millions, unless otherwise specified | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Jun. 30, 2013 | Jun. 30, 2012 | Jun. 30, 2013 | Jun. 30, 2012 | Dec. 31, 2012
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |
Income tax benefit from discontinued operations | $ 12 |  | $ 24 |  |
Operating revenues from discontinued operations |  | 406 |  | 849 |
Loss from discontinued operation before income taxes |  | 208 |  | 383 |
Pensions and benefits | 2,234 |  | 2,234 |  | 2,614
Edison Mission Energy |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |
Number of days after bankruptcy filing for settlement transaction (days) |  |  | 150 days |  |
Number of days for completion of settlement transaction agreement from petition date (days) |  |  | 210 days |  |
Joint tax liability | 189 |  | 189 |  |
Receivables from EME | 235 |  | 235 |  |
Edison Mission Energy | Pension Plans |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |
Pensions and benefits | 80 |  | 80 |  |
Deconsolidated charges recorded in accumulated other comprehensive income |  |  | 34 |  |
Plan Support Agreement |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |
Net receivable under plan support agreement | 46 |  | 46 |  |
Retirement liabilities assumed under plan support agreement | 104 |  | 104 |  |
Estimated loss under plan support agreement |  |  | $ 150 |  |

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