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Acquisitions, Discontinued Operations and Dispositions - Summary of Results (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |
Gain/(loss) on disposal of discontinued operations, net of tax | $ 0 | $ 0 | $ (13)
Income/(loss) from discontinued operations, net of income tax | $ 0 | 321 | (192)
Discontinued Operations | South Central Portfolio |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |
Operating revenue |  | 31 | 410
Operating costs and expenses |  | (23) | (346)
Other income |  | 0 | 2
(Loss)/gain from operations of discontinued components, before tax |  | 8 | 66
(Loss)/income on disposal of discontinued operations, net of tax |  | 20 | 0
Income/(loss) from discontinued operations, net of income tax |  | 28 | 66
Discontinued Operations | Carlsbad Energy Holdings LLC |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |
Operating revenue |  | 19 | 909
Operating costs and expenses |  | (9) | (661)
Other expenses |  | (5) | (174)
(Loss)/gain from operations of discontinued components, before tax |  | 5 | 74
Income tax expense |  | 0 | 4
Income/(loss) from discontinued operations, net of tax |  | 5 | 70
Gain/(loss) on disposal of discontinued operations, net of tax |  | 265 | (134)
Income/(expense) from California property tax indemnification |  | 22 | (153)
Income/(expense) from other commitments, indemnification and fees |  | 4 | (75)
(Loss)/income on disposal of discontinued operations, net of tax |  | 291 | (362)
Income/(loss) from discontinued operations, net of income tax |  | 296 | (292)
Discontinued Operations | GenOn |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |
Interest income-affiliate |  | 0 | 3
Income/(loss) from discontinued operations, net of tax |  | 0 | 3
Settlement consideration, insurance and services credit |  | 0 | 63
Pension and post-retirement liability assumptions |  | 0 | 21
Income/(expense) from other commitments, indemnification and fees |  | (3) | (53)
(Loss)/income on disposal of discontinued operations, net of tax |  | (3) | 31
Income/(loss) from discontinued operations, net of income tax |  | $ (3) | $ 34

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