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Derivative Instruments and Hedging Activities - Schedule of Derivative Gains and Losses (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2025	Sep. 30, 2024	Sep. 30, 2025	Sep. 30, 2024
Interest rate contracts
Derivative Instruments, Gain (Loss) [Line Items]
Unrealized gain (loss) on derivatives, net of tax	$ (8)	$ (57)	$ (40)	$ (33)
Energy-Related Commodity Contracts - Operating Revenue
Derivative Instruments, Gain (Loss) [Line Items]
Unrealized gain (loss) on derivatives, net of tax	(4)	72	(25)	11
Energy-Related Commodity Contracts - Cost of Operation
Derivative Instruments, Gain (Loss) [Line Items]
Unrealized gain (loss) on derivatives, net of tax	$ (1)	$ 0	$ (1)	$ (3)

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