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Financial Risk Management Activities - Schedule of Derivative Transactions Designated and Effective as Cash Flow Hedges (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended
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Sep. 30, 2025 | Sep. 30, 2024 | Sep. 30, 2025 | Sep. 30, 2024
Derivative Instruments and Hedging Activities Disclosures [Line Items] |  |  |  |
Amount of Pre-Tax Gain (Loss) Recognized in AOCL on Derivatives | $ 0 | $ (6) | $ (16) | $ 24
Amount of Pre-Tax Gain (Loss) Reclassified from AOCL into Income | 1 | 4 | 3 | 11
Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), after Reclassification, Tax | 0 | (3) | (5) | 4
Interest Rate Swap [Member] |  |  |  |
Derivative Instruments and Hedging Activities Disclosures [Line Items] |  |  |  |
Amount of Pre-Tax Gain (Loss) Recognized in AOCL on Derivatives | 0 | (6) | (16) | 24
Amount of Pre-Tax Gain (Loss) Reclassified from AOCL into Income | $ 1 | $ 4 | $ 3 | $ 11

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