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Acquisitions, Discontinued Operations and Dispositions - Discontinued Operations (Details) $ in Millions |  | 12 Months Ended |  |
--- | --- | --- | --- | ---
Feb. 06, 2018 USD ($) extension | Dec. 31, 2021 USD ($) MW | Dec. 31, 2020 USD ($) | Dec. 31, 2019 USD ($) | Feb. 04, 2019 USD ($) MW | Aug. 31, 2018 USD ($)
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |
Generation capacity (in MW) | MW |  | 18,000 |  |  |  |
Income from discontinued operations, net of income tax |  | $ 0 | $ 0 | $ 321 |  |
GenOn |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |
Income from discontinued operations, net of income tax |  |  |  | (3) |  |
Discontinued Operations | South Central Portfolio |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |
Consideration |  |  |  |  | $ 1,000 |
Generation capacity (in MW) | MW |  |  |  |  | 1,177 |
Income from discontinued operations, net of income tax |  |  |  | 28 |  |
Discontinued Operations | NRG Yield Inc. And Zephyr Renewables |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |
Consideration |  |  |  |  |  | $ 1,348
Discontinued Operations | NRG Yield Inc. And Zephyr Renewables | Cost To Complete Construction |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |
Other commitment |  |  |  | 15 |  |
Discontinued Operations | NRG Yield Inc. And Zephyr Renewables | Property Taxes For Solar Properties |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |
Other commitment |  |  |  | 22 |  |
Discontinued Operations | Carlsbad Energy Holdings LLC |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |
Consideration | $ 385 |  |  |  |  |
Other commitment |  | $ 23 | $ 23 |  |  |
Membership percentage | 100.00% |  |  |  |  |
Lease and easement agreement, number of extensions | extension | 2 |  |  |  |  |
Renewal term | 10 years |  |  |  |  |
Income from discontinued operations, net of income tax |  |  |  | $ 296 |  |

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