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Risk Management - Credit Risks (Details) - USD ($) $ in Millions | Dec. 31, 2024 | Dec. 31, 2023
--- | --- | ---
Credit Derivatives [Line Items] |  |
Additional Collateral, Aggregate Fair Value | $ 25 |
Energy commodity derivative contracts |  |
Credit Derivatives [Line Items] |  |
Letters of credit outstanding | 0 | $ 0
Cash margin, asset | 52 |
Variation margin, asset | 0 | 0
Variation margin, liability |  | 85
Other Current Liabilities | Contract and Over the Counter | Energy commodity derivative contracts |  |
Credit Derivatives [Line Items] |  |
Cash margin |  | $ 63
Restricted Cash | Contract and Over the Counter | Energy commodity derivative contracts |  |
Credit Derivatives [Line Items] |  |
Cash margin, asset | 104 |
Initial margin requirement | 52 |
Variation margin, asset | $ 52 |

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