Impact of Derivative Activities on Income and Accumulated Other Comprehensive Loss (Details) - USD ($)		12 Months Ended
		Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
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		62,000,000	(88,000,000)	(3,000,000)
Pre-tax gains (losses) reclassified into income during the period from regulatory assets and (liabilities)		(43,000,000)	78,000,000	2,000,000
Electric Commodity Contract | Not Designated as Hedging Instrument
Derivative [Line Items]
Derivative Instruments Gain (Loss) Reclassified To Regulatory Assets And Liabilities Net		62,000,000	(88,000,000)	(3,000,000)
Pre-tax gains (losses) reclassified into income during the period from regulatory assets and (liabilities)	[1]	$ 43,000,000	$ (78,000,000)	$ (2,000,000)

[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. FTR settlements are shared with customers and do not have a material impact on net income. Presented amounts reflect changes in fair value between auction and settlement dates, but exclude the original auction fair value.