Goodwill and Intangible Assets (Components of Intangible Assets) (Parenthetical) (Detail) - USD ($) $ in Millions	12 Months Ended
Dec. 31, 2024	Dec. 31, 2023
Goodwill And Intangible Assets Disclosure [Abstract]
RGGI allowance purchased and consumed		$ 613
Renewable energy credits consumed	$ 370	$ 209
RGGI allowances retired	$ 198

Allowance of acquisition of intangible assets renewable energy credits consumed.

No definition available.

Name:	d_AllowanceOfAcquisitionOfIntangibleAssetsRenewableEnergyCreditsConsumed
Namespace Prefix:	d_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration