v3.26.1
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, 2026
Mar. 31, 2025
Dec. 31, 2025
Derivative Instruments and Hedging Activities Disclosures [Line Items]      
(Gain) Loss Reclassified into Income, pre-tax $ 21 $ 2  
Amounts Reclassified from Accumulated Other Comprehensive Income (Loss) 12 2  
Cash Flow Hedges [Member]      
Derivative Instruments and Hedging Activities Disclosures [Line Items]      
Pre-Tax Balance at Beginning of Period 34 50 $ 50
Gain (Loss) Recognized in Accumulated Other Comprehensive Income (Loss), pre-tax 5   (11)
(Gain) Loss Reclassified into Income, pre-tax (1)   (5)
Pre-Tax Balance at End of Period 38   34
After-Tax Balance at Beginning of Period 24 36 36
Gain (Loss) Recognized in Accumulated Other Comprehensive Income (Loss), Net of Tax 4 (20) (8)
Amounts Reclassified from Accumulated Other Comprehensive Income (Loss) (1) $ 0 (4)
After-Tax Balance at End of Period $ 27   $ 24