v3.26.1
Risk Management and Hedging Activities - PAC - Not Designated as Hedging Contracts (Details) - PAC - Not Designated as Hedging - Commodity derivatives - USD ($)
$ in Millions
3 Months Ended
Mar. 31, 2026
Mar. 31, 2025
Regulatory Assets (Liabilities), Net, Unrealized Loss (Gain), Net, on Derivative Instruments [Roll Forward]    
Beginning balance $ 137 $ 97
Changes in fair value recognized in regulatory assets 34 10
Net gains reclassified to operating revenue 7 8
Net losses reclassified to cost of fuel and energy (67) (34)
Ending balance $ 111 $ 81