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Goodwill and Intangible Assets (Components of Intangible Assets) (Parenthetical) (Detail) $ in Millions	12 Months Ended
	Dec. 31, 2021 USD ($)
Goodwill And Intangible Assets Disclosure [Abstract]
RGGI allowance purchased and consumed	$ 158

X

- Definition

Allowance of acquisition of intangible assets.

+ References

No definition available.

+ Details

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

X

- References

No definition available.

+ Details

Name:	us-gaap_GoodwillAndIntangibleAssetsDisclosureAbstract
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration