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Asset Retirement Obligations (Changes to AROs) (Parenthetical) (Detail) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018
Asset Retirement Obligations [Line Items]
Asset retirement obligations, non current	$ 4,866	$ 2,250
Current Liabilities
Asset Retirement Obligations [Line Items]
Asset retirement obligation, current	408	282
Virginia Electric and Power Company
Asset Retirement Obligations [Line Items]
Asset retirement obligations, non current	3,241	1,200
Asset retirement obligation, current	$ 340	245
License extension term	20 years
Dominion Energy Gas Holdings, LLC | Other Deferred Credits And Other Liabilities
Asset Retirement Obligations [Line Items]
Asset retirement obligations, non current	$ 75	$ 74

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Asset Retirement Obligations [Line Items]

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+ References

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 410
-SubTopic 20
-Section 50
-Paragraph 1
-Subparagraph (c)
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+ References

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-Topic 410
-SubTopic 20
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-Paragraph 1
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