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Acquisitions, Discontinued Operations and Dispositions - Summary of Results (Details) - USD ($) $ in Millions | 2 Months Ended | 3 Months Ended | 5 Months Ended | 6 Months Ended
--- | --- | --- | --- | ---
Jun. 14, 2017 | Jun. 30, 2018 | Jun. 30, 2017 | Jun. 14, 2017 | Jun. 30, 2018 | Jun. 30, 2017
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |
Loss from discontinued operations, net of tax |  | $ (25) | $ (741) |  | $ (25) | $ (775)
Discontinued Operations | GenOn |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |
Operating revenues | $ 265 | 0 |  | $ 646 | 0 |
Operating costs and expenses | (327) | 0 |  | (700) | 0 |
Other expenses | (54) | 0 |  | (98) | 0 |
Loss from operations of discontinued components, before tax | (116) | 0 |  | (152) | 0 |
Income tax expense | 8 | 0 |  | 9 | 0 |
Loss from operations of discontinued components | (124) | 0 |  | (161) | 0 |
Interest income - affiliate | 3 | 2 |  | 6 | 3 |
Loss from operations of discontinued components, net of tax | (121) | 2 |  | (155) | 3 |
Pre-tax loss on deconsolidation | (208) | 0 |  | (208) | 0 |
Settlement consideration and services credit | (289) | 0 |  | (289) | 0 |
Pension and post-retirement liability assumption | (119) | 1 |  | (119) | 1 |
Advisory and consulting fees | (4) | (1) |  | (4) | (2) |
Other | 0 | (27) |  | 0 | (27) |
Loss on disposal of discontinued components, net of tax | (620) | (27) |  | (620) | (28) |
Loss from discontinued operations, net of tax | $ (741) | $ (25) |  | $ (775) | $ (25) |

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