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		6 Months Ended
	Jun. 30, 2025	Jun. 30, 2024	Jun. 30, 2025	Jun. 30, 2024
Derivative Instruments Not Designated as Hedging Instruments, Gain (Loss), Net	$ 232	$ 224	$ (11)	$ 77
Operating Revenues [Member]
Derivative Instruments Not Designated as Hedging Instruments, Gain (Loss), Net	233	225	(8)	77
Energy Costs [Member]
Derivative Instruments Not Designated as Hedging Instruments, Gain (Loss), Net	$ (1)	$ (1)	$ (3)	$ (0)