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Discontinued Operations (Textual) (Details) (USD $) In Millions, unless otherwise specified |  |  | 3 Months Ended |  | 12 Months Ended
--- | --- | --- | --- | --- | ---
Dec. 31, 2012 | Dec. 31, 2011 | Dec. 31, 2012 Homer City | Sep. 30, 2012 Homer City | Dec. 31, 2011 Homer City | Dec. 31, 2012 Pension Plans | Dec. 31, 2011 Pension Plans | Dec. 31, 2012 Edison Mission Energy | Dec. 31, 2012 Edison Mission Energy Pension Plans | Dec. 31, 2012 Plan Support Agreement
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 |  |
Impairment and other charges |  |  | $ 89 | $ 113 | $ 1,030 |  |  |  |  |  |  |
Other charges to write down assets held for sale to net realizable value, net of tax |  |  | 53 | 68 |  |  |  |  |  |  |  |
Investments in subsidiaries | 2 | 2 |  |  |  |  |  |  |  | 0 |  |
Retirement liabilities for EME employees | 2,614 | 2,715 |  |  |  | 1,387 |  | 1,329 |  |  | 80 |
Joint tax liability |  |  |  |  |  |  |  |  |  | 183 |  |
Receivables from EME | 207 |  |  |  |  |  |  |  |  | 229 |  |
Deconsolidated charges recorded in other comprehensive income |  |  |  |  |  | 34 | [1] | 0 | [1] |  | 34 |
Net receivable under plan support agreement |  |  |  |  |  |  |  |  |  |  |  | 46
Retirement liabilities assumed under plan support agreement |  |  |  |  |  |  |  |  |  |  |  | 104
Estimated loss under plan support agreement |  |  |  |  |  |  |  |  |  |  |  | $ 150
[1] | The retirement plan liabilities of EME have been deconsolidated as a result of the bankruptcy filing by EME, except for qualified pension plans that Edison International is jointly liable with EME under the Internal Revenue Code. See Note 17 for further information.

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