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Income Taxes (Narrative) (Detail) - USD ($) $ in Millions	1 Months Ended		3 Months Ended		9 Months Ended
	Oct. 31, 2025	Sep. 30, 2025	Sep. 30, 2025	Sep. 30, 2024	Sep. 30, 2025	Sep. 30, 2024	Dec. 31, 2024
Income Taxes [Line Items]
Production tax credit					$ 50
Remeasurement of unrecognized tax benefit		$ 135	$ 135		135		$ 170
Income tax (benefit) expense from discontinued operations			(2)	$ (9)	(5)	$ 31
Virginia Electric and Power Company
Income Taxes [Line Items]
Production tax credit					66	$ 53
Remeasurement of unrecognized tax benefit		58	58		58		$ 56
Transfer of nuclear production tax credits, received in cash		48
Virginia Electric and Power Company | Subsequent Event
Income Taxes [Line Items]
Transfer of nuclear production tax credits, received in cash	$ 24
Dominion Energy
Income Taxes [Line Items]
Effective tax rate income tax net benefit					18
Remeasurement of unrecognized tax benefit		$ 30	$ 30		$ 30

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Amount of tax expense (benefit) related to a discontinued operation. Includes, but is not limited to, tax expense (benefit) related to income (loss) from operations during the phase-out period, tax expense (benefit) related to gain (loss) on disposal, tax expense (benefit) related to gain (loss) for reversal of write-down (write-down) to fair value, less cost to sell, and tax expense (benefit) related to adjustments of a prior period gain (loss) on disposal.

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