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Acquisitions, Discontinued Operations and Dispositions - Summary of Results (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |
Income/(loss) from discontinued operations, net of tax | $ 0 | $ 0 | $ 321
Discontinued Operations | South Central Portfolio |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |
Operating revenue |  |  | 31
Operating costs and expenses |  |  | (23)
(Loss)/gain from operations of discontinued components, before tax |  |  | 8
Income/(loss) on disposal of discontinued operations, net of tax |  |  | 20
Income/(loss) from discontinued operations, net of tax |  |  | 28
Discontinued Operations | Carlsbad Energy Holdings LLC |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |
Operating revenue |  |  | 19
Operating costs and expenses |  |  | (9)
Other expenses |  |  | (5)
Gain/(loss) from discontinued operations, net of tax |  |  | 5
Gain/(loss) on disposal of discontinued operations, net of tax |  |  | 265
Income/(expense) from California property tax indemnification |  |  | 22
Income/(expense) from other commitments, indemnification and fees |  |  | 4
Income/(loss) on disposal of discontinued operations, net of tax |  |  | 291
Income/(loss) from discontinued operations, net of tax |  |  | $ 296

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