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Dispositions - Narrative (Details) | 3 Months Ended | 12 Months Ended |  |
--- | --- | --- | --- | ---
Mar. 31, 2024 USD ($) MWh project | Mar. 31, 2023 USD ($) | Dec. 31, 2023 USD ($) | Mar. 01, 2023 USD ($) project | Oct. 01, 2022 USD ($)
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |
Period to obtain consent (in years) | 2 years |  |  |  |
Number of solar projects | project | 2 |  |  |  |
Clean Energy Businesses | RWE | Maximum |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |
Estimate of possible loss (up to) | $ 172,000,000 |  |  |  |
Disposal Group, Held-for-sale, Not Discontinued Operations | Clean Energy Businesses |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |
Consideration from sale of business |  |  |  | $ 3,993,000,000 | $ 6,800,000,000
Gain on sale of subsidiary | 835,000,000 | $ 855,000,000 | $ 865,000,000 |  |
Gain on sale of subsidiary, after tax | 745,000,000 | 791,000,000 | 767,000,000 |  |
Downward price adjustment | 30,000,000 |  |  |  |
Downward price adjustment, after tax | $ 22,000,000 |  |  |  |
Tax equity projects | project | 3 |  |  | 2 |
Transaction costs, before tax | $ 0 | 11,000,000 |  |  |
Transaction costs, after tax |  | $ 8,000,000 |  |  |
Depreciation and amortization, before tax |  |  | 41,000,000 |  |
Depreciation and amortization, after tax |  |  | $ 28,000,000 |  |
Disposal Group, Disposed of by Sale, Not Discontinued Operations | Crane Project |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |
Holding period (in years) | 5 years |  |  |  |
Carrying value of tax equity interest | $ 7,000,000 |  |  |  |
Electric Energy (MWh) |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |
Notional amount | MWh | 31,374,625 |  |  |  |
Broken Bow II | Electric Energy (MWh) | Clean Energy Businesses |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |
Deferred projects | project | 1 |  |  | 1 |
Notional amount | MWh | 75 |  |  |  |

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