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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