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Financial Risk Management Activities - Schedule of Reconciliation for Derivative Activity Included in Accumulated Other Comprehensive Income (Loss) (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended | 12 Months Ended
--- | --- | --- | ---
Jun. 30, 2025 | Jun. 30, 2024 | Jun. 30, 2025 | Jun. 30, 2024 | Dec. 31, 2024
Derivative Instruments and Hedging Activities Disclosures [Line Items] |  |  |  |  |
(Gain) Loss Reclassified into Income, pre-tax | $ 4 | $ 0 | $ 6 | $ 4 |
Amounts Reclassified from Accumulated Other Comprehensive Income (Loss) | 3 | 1 | 5 | 3 |
Cash Flow Hedges [Member] |  |  |  |  |
Derivative Instruments and Hedging Activities Disclosures [Line Items] |  |  |  |  |
Pre-Tax Balance at Beginning of Period |  |  | 50 | 4 | $ 4
Gain (Loss) Recognized in Accumulated Other Comprehensive Income (Loss), pre-tax |  |  | (16) |  | 59
(Gain) Loss Reclassified into Income, pre-tax |  |  | (2) |  | (13)
Pre-Tax Balance at End of Period | 32 |  | 32 |  | 50
After-Tax Balance at Beginning of Period |  |  | 36 | 3 | 3
Gain (Loss) Recognized in Accumulated Other Comprehensive Income (Loss), Net of Tax | 8 | 2 | (12) | 22 | 42
Amounts Reclassified from Accumulated Other Comprehensive Income (Loss) | (1) | $ (3) | (1) | $ (5) | (9)
After-Tax Balance at End of Period | $ 23 |  | $ 23 |  | $ 36

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