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Acquisitions and Dispositions - Dispositions Narrative (Details) - USD ($) $ in Millions | Sep. 16, 2024 | Nov. 01, 2023 | Oct. 02, 2023 | Jan. 06, 2023 | Jun. 01, 2022 | Dec. 31, 2023
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Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |
Disposal Group, Not Discontinued Operation, Gain Loss on Disposal Statement of Income Extensible List Not Disclosed Flag |  |  | 82 million |  |  |
STP |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |
Ownership percentage |  |  |  |  |  | 44.00%
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 |
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% |  |  |
Disposal Group, Disposed of by Sale, Not Discontinued Operations | West/Services/Other | Airtron |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |
Proceeds from sale of equity interest | $ 500 |  |  |  |  |
Working capital and other adjustments, net | 20 |  |  |  |  |
Proceeds from sale of, net of working capital adjustments | 480 |  |  |  |  |
Gain on sale of business | $ 204 |  |  |  |  |
Disposal Group, Disposed of by Sale, Not Discontinued Operations | West/Services/Other | Airtron | Airtron |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |
Ownership percentage, parent | 100.00% |  |  |  |  |
Disposal Group, Disposed of by Sale, Not Discontinued Operations | East |  |  |  |  |  |
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 |  |
Disposal Group, Held-for-sale or Disposed of by Sale, Not Discontinued Operations | STP |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |
Proceeds from sale of, net of working capital adjustments |  | $ 1,654 |  |  |  |
Ownership percentage |  | 44.00% |  |  |  |
Proceeds from sale |  | $ 1,750 |  |  |  |
Working capital adjustments |  | 96 |  |  |  |
Gain on sale |  | $ 1,200 |  |  |  |

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