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Risk Management - FV Input Level - Assets (Details) - USD ($) $ in Millions | Dec. 31, 2024 | Dec. 31, 2023
--- | --- | ---
Derivative [Line Items] |  |
Gross amount | $ 62 | $ 178
Energy commodity derivative contracts |  |
Derivative [Line Items] |  |
Gross amount | 35 | 140
Contracts available for netting | (19) | (16)
Cash collateral held(a) | 0 | 0
Net amount | 16 | 124
Interest rate contracts |  |
Derivative [Line Items] |  |
Gross amount | 27 | 38
Contracts available for netting | 0 | 0
Cash collateral held(a) | 0 | 0
Net amount | 27 | 38
Level 1 | Energy commodity derivative contracts |  |
Derivative [Line Items] |  |
Gross amount | 6 | 65
Level 1 | Interest rate contracts |  |
Derivative [Line Items] |  |
Gross amount | 0 | 0
Level 2 | Energy commodity derivative contracts |  |
Derivative [Line Items] |  |
Gross amount | 29 | 75
Level 2 | Interest rate contracts |  |
Derivative [Line Items] |  |
Gross amount | 27 | 38
Level 3 | Energy commodity derivative contracts |  |
Derivative [Line Items] |  |
Gross amount | 0 | 0
Level 3 | Interest rate contracts |  |
Derivative [Line Items] |  |
Gross amount | $ 0 | $ 0

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