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Asset Retirement Obligations (Narrative) (Detail) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020
Asset Retirement Obligations [Line Items]
Asset retirement obligation, liabilities incurred	$ 31	$ 67
Nuclear decommissioning trust funds	7,950	6,900
Dominion Energy
Asset Retirement Obligations [Line Items]
Asset retirement obligation, liabilities incurred	2,000	1,900
D Virginia Electric And Power Company | Future Decommissioning Of Nuclear Facilities
Asset Retirement Obligations [Line Items]
Asset retirement obligation, liabilities incurred	900	900
D Virginia Electric And Power Company | D Cost Of Landfills And Beneficial Reuse
Asset Retirement Obligations [Line Items]
Asset retirement obligation, liabilities incurred	2,900	2,800
Virginia Electric and Power Company
Asset Retirement Obligations [Line Items]
Asset retirement obligation, liabilities incurred	26	48
Nuclear decommissioning trust funds	$ 3,734	$ 3,197

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Asset Retirement Obligations [Line Items]

+ References

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Amount of asset retirement obligations incurred during the period.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 410
-SubTopic 20
-Section 50
-Paragraph 1
-Subparagraph (c)(1)
-URI http://asc.fasb.org/extlink&oid=6392692&loc=d3e7535-110849

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Decommission fund to pay for the costs of decontaminating and decommissioning of facilities through collection of revenues derived from utility assessments and government appropriations. Decommission fund investment for the process whereby a power station, at the end of its economic life, is taken permanently out of service and its site made available for other purposes. In the case of a nuclear station this comprises three different states of clearance. Immediately after the final closure, radioactive material such as nuclear fuel and operational waste is removed and the buildings surrounding the reactor shield are dismantled and finally the reactor itself is dismantled.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.12)
-URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682

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