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Financial Risk Management Activities - Schedule of Derivative Instruments Not Designated as Hedging Instruments and Impact on Results of Operations (Details) - Energy-Related Contracts [Member] - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2025
Sep. 30, 2024
Sep. 30, 2025
Sep. 30, 2024
Derivative Instruments Not Designated as Hedging Instruments, Gain (Loss), Net $ 36 $ 56 $ 25 $ 133
Operating Revenues [Member]        
Derivative Instruments Not Designated as Hedging Instruments, Gain (Loss), Net 34 56 26 133
Energy Costs [Member]        
Derivative Instruments Not Designated as Hedging Instruments, Gain (Loss), Net $ 2 $ (0) $ (1) $ 0