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Discontinued Operations, Acquisitions and Dispositions - Summary of Results (Details) - USD ($) $ in Millions | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2017 | Sep. 30, 2017 | Jun. 30, 2017 | Mar. 31, 2017 | Dec. 31, 2016 | Sep. 30, 2016 | Jun. 30, 2016 | Mar. 31, 2016 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |  |  |  |
Income (Loss) from Discontinued Operations, Net of Tax, Attributable to Parent | $ 13 | $ (27) | $ (741) | $ (34) | $ (164) | $ 265 | $ (113) | $ 104 | $ (789) | $ 92 | $ (105)
GenOn | Discontinued Operations |  |  |  |  |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |  |  |  |
Operating revenues |  |  |  |  |  |  |  |  | 646 | 1,862 |
Operating costs and expenses |  |  |  |  |  |  |  |  | (702) | (1,896) |
Gain on sale of assets |  |  |  |  |  |  |  |  | 0 | 294 |
Other expenses |  |  |  |  |  |  |  |  | (98) | (168) |
(Loss)/Income from operations of discontinued components, before tax |  |  |  |  |  |  |  |  | (154) | 92 |
Income tax expense |  |  |  |  |  |  |  |  | 9 | 11 |
(Loss)/Income from operations of discontinued components |  |  |  |  |  |  |  |  | (163) | 81 |
Interest income - affiliate |  |  |  |  |  |  |  |  | 8 | 11 |
(Loss)/Income from operations of discontinued components, net of tax |  |  |  |  |  |  |  |  | (155) | 92 |
Pre-tax loss on deconsolidation |  |  |  |  |  |  |  |  | (208) | 0 |
Settlement consideration and services credit |  |  |  |  |  |  |  |  | (289) | 0 |
Pension and post-retirement liability assumption |  |  |  |  |  |  |  |  | (131) | 0 |
Other |  |  |  |  |  |  |  |  | (6) | 0 |
Loss on disposal of discontinued components, net of tax |  |  | $ (208) |  |  |  |  |  | (634) | 0 |
Income (Loss) from Discontinued Operations, Net of Tax, Attributable to Parent |  |  |  |  |  |  |  |  | $ (789) | $ 92 |

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