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Risk Management (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022
Derivative [Line Items] |  |  |
Derivative Liability, Fair Value, Amount Not Offset Against Collateral | $ 41 | $ 28 |
Net gain or loss recognized in the statement of income offset by regulatory accounting | 5 | (403) | $ (188)
Margin Deposit Assets | 15 |  |
Right to reclaim cash collateral | 16 | 1 |
Derivative, Collateral, Obligation to Return Cash | 5 | $ 5 |
Derivative, Collateral, Obligation to Return Securities | 24 |  |
Derivative Asset, Fair Value, Amount Offset Against Collateral | 29 |  |
Credit Risk Contract [Member] |  |  |
Derivative [Line Items] |  |  |
Derivative, Net Liability Position, Aggregate Fair Value | 194 |  |
Collateral Already Posted, Aggregate Fair Value | 70 |  |
Collateral Aggregate Fair Value | $ 126 |  |

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- Definition The aggregate fair value of assets that would be required to be posted as collateral for derviative instruments with credit-risk-related contingent features if the credit-risk-related contingent features were triggered at the end of the reporting period. + References No definition available. + Details
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