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Accounting for Derivative Instruments and Hedging Activities - Impact of Statement of Operations (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Derivative Instruments, Gain (Loss) [Line Items]
Unrealized gain (loss) on derivatives, net of tax	$ (4)	$ (6)	$ 28
Interest rate contracts
Derivative Instruments, Gain (Loss) [Line Items]
Unrealized gain (loss) on derivatives, net of tax	29	(17)	100
Energy-Related Commodity Contracts - Operating Revenue
Derivative Instruments, Gain (Loss) [Line Items]
Unrealized gain (loss) on derivatives, net of tax	(32)	23	(174)
Energy-Related Commodity Contracts - Cost of Operation
Derivative Instruments, Gain (Loss) [Line Items]
Unrealized gain (loss) on derivatives, net of tax	$ (2)	$ 2	$ 0

The net change in the difference between the fair value and the carrying value, or in the comparative fair values, of derivative instruments, including options, swaps, futures, and forward contracts, held at each balance sheet date, that was included in earnings for the period.

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