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Risk Management - FV Input Level - Liabilities (Details) - USD ($) $ in Millions | Dec. 31, 2024 | Dec. 31, 2023
--- | --- | ---
Derivative [Line Items] |  |
Gross amount | $ (389) | $ (395)
Energy commodity derivative contracts |  |
Derivative [Line Items] |  |
Gross amount | (106) | (113)
Contracts available for netting | 19 | 16
Cash collateral posted |  | (85)
Cash collateral posted(a) | 52 |
Net amount | (35) | (182)
Interest rate contracts |  |
Derivative [Line Items] |  |
Gross amount | (254) | (278)
Contracts available for netting | 0 | 0
Cash collateral posted |  | 0
Cash collateral posted(a) | 0 |
Net amount | (254) | (278)
Foreign currency contracts |  |
Derivative [Line Items] |  |
Gross amount | (29) | (4)
Contracts available for netting | 0 | 0
Cash collateral posted |  | 0
Cash collateral posted(a) | 0 |
Net amount | (29) | (4)
Level 1 | Energy commodity derivative contracts |  |
Derivative [Line Items] |  |
Gross amount | (17) | (17)
Level 1 | Interest rate contracts |  |
Derivative [Line Items] |  |
Gross amount | 0 | 0
Level 1 | Foreign currency contracts |  |
Derivative [Line Items] |  |
Gross amount | 0 | 0
Level 2 | Energy commodity derivative contracts |  |
Derivative [Line Items] |  |
Gross amount | (89) | (96)
Level 2 | Interest rate contracts |  |
Derivative [Line Items] |  |
Gross amount | (254) | (278)
Level 2 | Foreign currency contracts |  |
Derivative [Line Items] |  |
Gross amount | (29) | (4)
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
Level 3 | Foreign currency contracts |  |
Derivative [Line Items] |  |
Gross amount | $ 0 | $ 0

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