Impact of Derivative Activities on Income and Accumulated Other Comprehensive Loss (Details) - USD ($)		12 Months Ended
		Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Derivative [Line Items]
Fair Value Hedges, Net		$ 0	$ 0	$ 0
Not Designated as Hedging Instrument
Derivative [Line Items]
Derivative Instruments Gain (Loss) Reclassified To Regulatory Assets And Liabilities Net		(88,000,000)	(3,000,000)	28,000,000
Pre-tax gains (losses) reclassified into income during the period from regulatory assets and (liabilities)		78,000,000	2,000,000	(20,000,000)
Electric Commodity Contract | Not Designated as Hedging Instrument
Derivative [Line Items]
Derivative Instruments Gain (Loss) Reclassified To Regulatory Assets And Liabilities Net		(88,000,000)	(3,000,000)	28,000,000
Pre-tax gains (losses) reclassified into income during the period from regulatory assets and (liabilities)	[1]	$ (78,000,000)	$ (2,000,000)	$ 20,000,000

[1] Recorded to electric fuel and purchased power. These derivative settlement gains and losses are shared with electric customers through fuel and purchased energy cost-recovery mechanisms and reclassified out of income as regulatory assets or liabilities, as appropriate.