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Risk Management (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
Derivative [Line Items] |  |  |
Derivative Liability, Fair Value, Amount Not Offset Against Collateral | $ 28 | $ 5 |
Net gain or loss recognized in the statement of income offset by regulatory accounting | (403) | (188) | $ (119)
Margin Deposit Assets | 26 |  |
Right to reclaim cash collateral | 1 | 0 |
Derivative, Collateral, Obligation to Return Cash | 5 | $ 140 |
Derivative, Collateral, Obligation to Return Securities | 12 |  |
Derivative Asset, Fair Value, Amount Offset Against Collateral | 17 |  |
Credit Risk Contract [Member] |  |  |
Derivative [Line Items] |  |  |
Derivative, Net Liability Position, Aggregate Fair Value | 217 |  |
Collateral Already Posted, Aggregate Fair Value | 95 |  |
Collateral Aggregate Fair Value | 166 |  |
Right to reclaim cash collateral | $ 55 |  |
Letter of Credit [Member] | Credit Risk Contract [Member] |  |  |
Derivative [Line Items] |  |  |
Collateral posted as letter of credit | 40 million |  |

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