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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 | 9 Months Ended | 12 Months Ended
--- | --- | --- | ---
Sep. 30, 2025 | Sep. 30, 2024 | Sep. 30, 2025 | Sep. 30, 2024 | Dec. 31, 2024
Derivative Instruments and Hedging Activities Disclosures [Line Items] |  |  |  |  |
(Gain) Loss Reclassified into Income, pre-tax | $ 2 | $ (1) | $ 8 | $ 3 |
Amounts Reclassified from Accumulated Other Comprehensive Income (Loss) | 0 | (1) | 5 | 2 |
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 |  |  | (3) |  | (13)
Pre-Tax Balance at End of Period | 31 |  | 31 |  | 50
After-Tax Balance at Beginning of Period |  |  | 36 | 3 | 3
Gain (Loss) Recognized in Accumulated Other Comprehensive Income (Loss), Net of Tax | 0 | (5) | (12) | 17 | 42
Amounts Reclassified from Accumulated Other Comprehensive Income (Loss) | (1) | $ (3) | (2) | $ (8) | (9)
After-Tax Balance at End of Period | $ 22 |  | $ 22 |  | $ 36

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