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Acquisitions, Discontinued Operations and Dispositions - Summarized Results of Discontinued Operations (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2020 | Sep. 30, 2019 | Sep. 30, 2020 | Sep. 30, 2019
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |
(Loss)/Gain from discontinued operations, including disposal, net of tax | $ 0 | $ (2) | $ 0 | $ 399
Discontinued Operations, Disposed of by Sale | South Central Portfolio |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |
Operating revenues |  | 0 |  | 31
Operating costs and expenses |  | 0 |  | (23)
Gain from operations of discontinued components/discontinued operations, net of tax |  | 0 |  | 8
(Loss)/Gain on disposal of discontinued operation, net of tax |  | (1) |  | 27
(Loss)/Gain from discontinued operations, including disposal, net of tax |  | (1) |  | 35
Discontinued Operations, Disposed of by Sale | Carlsbad Energy Holdings LLC |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |
Operating revenues |  | 0 |  | 19
Operating costs and expenses |  | 0 |  | (9)
Other expense |  | 0 |  | (5)
Gain from operations of discontinued components/discontinued operations, net of tax |  | 0 |  | 5
(Loss)/gain on disposal of discontinued operations, net of tax |  | (1) |  | 330
Other Commitments, Indemnification and Fees |  | 0 |  | 27
(Loss)/Gain on disposal of discontinued operation, net of tax |  | (1) |  | 357
(Loss)/Gain from discontinued operations, including disposal, net of tax |  | $ (1) |  | 362
Discontinued Operations | GenOn |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |
(Loss)/Gain on disposal of discontinued operation, net of tax |  |  |  | $ 2

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