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Discontinued Operations (Textual) (Details) $ in Millions | 1 Months Ended | 3 Months Ended | 12 Months Ended
--- | --- | --- | ---
Aug. 31, 2014 installment | Apr. 30, 2014 USD ($) | Dec. 31, 2015 USD ($) | Sep. 30, 2015 USD ($) | Jun. 30, 2015 USD ($) | Mar. 31, 2015 USD ($) | Dec. 31, 2014 USD ($) | Sep. 30, 2014 USD ($) | Jun. 30, 2014 USD ($) | Mar. 31, 2014 USD ($) | Dec. 31, 2015 USD ($) | Dec. 31, 2014 USD ($) | Dec. 31, 2013 USD ($)
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Cash portion of settlement payment |  |  |  |  |  |  |  |  |  |  | $ 176 | $ 225 | $ 0
Income (loss) from discontinued operations, net of tax |  |  | $ (8) | $ 43 | $ 0 | $ 0 | $ 39 | $ (16) | $ 184 | $ (22) | 35 | 185 | 36
Loss before income taxes |  |  |  |  |  |  |  |  |  |  | 15 | (525) |
Edison International |  |  |  |  |  |  |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Income (loss) from discontinued operations, net of tax |  |  |  |  |  |  |  |  |  |  | 35 | 185 | 36
Loss before income taxes |  |  |  |  |  |  |  |  |  |  |  | $ 525 |
Edison Mission Energy |  |  |  |  |  |  |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Cash portion of settlement payment |  | $ 225 |  |  |  |  |  |  |  |  |  |  |
Number of Installments | installment | 2 |  |  |  |  |  |  |  |  |  |  |  |
Installment one, tax attribute settlement |  |  |  | $ 204 |  |  |  |  |  |  |  |  |
Installment two, tax attribute settlement |  |  | $ 214 |  |  |  |  |  |  |  | $ 214 |  |
Homer City |  |  |  |  |  |  |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Impairment and other charges, after tax |  |  |  |  |  |  |  |  |  |  |  |  | $ 36

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