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Risk Management - Credit Risks (Details) - USD ($) $ in Millions | Dec. 31, 2023 | Dec. 31, 2022
--- | --- | ---
Credit Derivatives [Line Items] |  |
Additional Collateral, Aggregate Fair Value | $ 54 |
Energy commodity derivative contracts |  |
Credit Derivatives [Line Items] |  |
Letters of credit outstanding | 0 | $ 0
Initial margin requirement | 22 |
Variation Margin Payable, Derivative | 85 |
Other Current Liabilities | Contract and Over the Counter | Energy commodity derivative contracts |  |
Credit Derivatives [Line Items] |  |
Cash margin | $ 63 | $ 1

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