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Acquisitions and Dispositions - Dispositions Narrative (Details) $ in Millions | Nov. 01, 2023 USD ($) | Oct. 02, 2023 USD ($) | Jan. 06, 2023 USD ($) | Jun. 01, 2022 USD ($) | Dec. 01, 2021 USD ($) MW | Feb. 03, 2021 USD ($) | Dec. 31, 2023 MW
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Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |
Generation capacity (in MW) | MW |  |  |  |  |  |  | 13
Disposal Group, Not Discontinued Operation, Gain Loss on Disposal Statement of Income Extensible List Not Disclosed Flag |  | 82 million |  |  |  |  |
Disposal Group, Held-for-sale or Disposed of by Sale, Not Discontinued Operations | Indemnification Agreement |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |
Guarantee (up to) |  |  |  |  | $ 39 |  |
Disposal Group, Held-for-sale or Disposed of by Sale, Not Discontinued Operations | Agua Caliente Solar Project |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |
Proceeds from sale |  |  |  |  |  | $ 202 |
Gain on sale |  |  |  |  |  | $ 17 |
Percentage of ownership sold |  |  |  |  |  | 35.00% |
Cash disposed |  |  |  |  |  | $ 7 |
Disposal Group, Disposed of by Sale, Not Discontinued Operations | Gregory |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |
Proceeds from sale |  | $ 102 |  |  |  |  |
Gain on sale |  | $ 82 |  |  |  |  |
Disposal Group, Disposed of by Sale, Not Discontinued Operations | Gregory | Gregory |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |
Ownership percentage, parent |  | 100.00% |  |  |  |  |
East | Disposal Group, Disposed of by Sale, Not Discontinued Operations |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |
Proceeds from sale of land and related generation assets |  |  | $ 212 |  |  |  |
Transaction fees on disposal |  |  | 3 |  |  |  |
Gain on sale of land and related generation assets |  |  | $ 199 |  |  |  |
East/West Other | Disposal Group, Held-for-sale or Disposed of by Sale, Not Discontinued Operations |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |
Proceeds from sale |  |  |  |  | 760 |  |
Working capital adjustments |  |  |  |  | 140 |  |
Proceeds from sale of, net of working capital adjustments |  |  |  |  | $ 620 |  |
Generation capacity (in MW) | MW |  |  |  |  | 4,850 |  |
Gain (loss) on sale of business |  |  |  |  | $ 207 |  |
STP |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |
Ownership percentage | 44.00% |  |  |  |  |  | 44.00%
STP | Disposal Group, Held-for-sale or Disposed of by Sale, Not Discontinued Operations |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |
Ownership percentage | 44.00% |  |  |  |  |  |
Proceeds from sale | $ 1,750 |  |  |  |  |  |
Working capital adjustments | 96 |  |  |  |  |  |
Proceeds from sale of, net of working capital adjustments | 1,654 |  |  |  |  |  |
Gain on sale | $ 1,200 |  |  |  |  |  |
Watson Facility |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |
Ownership percentage |  |  |  | 49.00% |  |  |
Proceeds from sale of investment |  |  |  | $ 59 |  |  |
Gain on sale of investment |  |  |  | $ 46 |  |  |
Arthur Kill Plant | East/West Other |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |
Generation capacity (in MW) | MW |  |  |  |  | 866 |  |

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