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	12 Months Ended
	Dec. 31, 2025	Dec. 31, 2024	Dec. 31, 2023
Offsetting Assets [Line Items]
Derivative Instruments Not Designated as Hedging Instruments, Gain (Loss), Net	$ (111)	$ 29	$ 1,567
Operating Revenues [Member]
Offsetting Assets [Line Items]
Derivative Instruments Not Designated as Hedging Instruments, Gain (Loss), Net	(108)	27	1,567
Energy Costs [Member]
Offsetting Assets [Line Items]
Derivative Instruments Not Designated as Hedging Instruments, Gain (Loss), Net	$ (3)	$ 2	$ 0