v3.25.1
Financial Risk Management Activities - Schedule of Reconciliation for Derivative Activity Included in Accumulated Other Comprehensive Income (Loss) (Details) - USD ($)
$ in Millions
 3 Months Ended 12 Months Ended
Mar. 31, 2025
Mar. 31, 2024
Dec. 31, 2024
Derivative Instruments and Hedging Activities Disclosures [Line Items]      
(Gain) Loss Reclassified into Income, pre-tax $ 2 $ 4  
Amounts Reclassified from Accumulated Other Comprehensive Income (Loss) 2 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 (27)   59
(Gain) Loss Reclassified into Income, pre-tax (1)   (13)
Pre-Tax Balance at End of Period 22   50
After-Tax Balance at Beginning of Period 36 3 3
Gain (Loss) Recognized in Accumulated Other Comprehensive Income (Loss), Net of Tax (20) 20 42
Amounts Reclassified from Accumulated Other Comprehensive Income (Loss) 0 $ (2) (9)
After-Tax Balance at End of Period $ 16   $ 36