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Significant Accounting Policies (Narrative) (Detail) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022	Jan. 01, 2022
Significant Accounting Policies [Line Items]
Changes in net unrecognized pension and other postretirement benefit costs (credits), net of tax	$ 2	$ 0	$ 0
Changes in net unrecognized pension and other postretirement benefit costs (credits), tax	(1)		(1)
Net pension and other postretirement benefit costs (credits), net of tax	(12)	(13)	(13)
Net pension and other postretirement benefit costs (credits), tax	4	5	5
Increase (decrease) in assets held for sale		48
Accrued unbilled revenue	797	1,000
Cumulative decrease of retained earnings with related to mark-to-market- impacts				$ (1,200)
Change In Method of Accounting for Employee Benefit Plan Market-Related Impacts
Significant Accounting Policies [Line Items]
Changes in net unrecognized pension and other postretirement benefit costs (credits), net of tax	278	(27)	218
Changes in net unrecognized pension and other postretirement benefit costs (credits), tax	(98)	9	(75)
Net pension and other postretirement benefit costs (credits), net of tax	(68)	28	(88)
Net pension and other postretirement benefit costs (credits), tax	24	(15)	$ 32
Current Assets Held for Sale | Held for Sale
Significant Accounting Policies [Line Items]
Accrued unbilled revenue		284
Virginia Electric and Power Company
Significant Accounting Policies [Line Items]
Accrued unbilled revenue	$ 611	$ 550
Stonepeak | OSWP
Significant Accounting Policies [Line Items]
Percentage of equity interest sold to noncontrolling interest owners	50.00%

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