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Asset Retirement Obligations (Narrative) (Detail) $ in Millions	1 Months Ended	12 Months Ended
	May 31, 2024 Station	Dec. 31, 2024 USD ($)		Dec. 31, 2023 USD ($)
Asset Retirement Obligations [Line Items]
Asset retirement obligation, liabilities incurred		$ 1,126	[1]	$ 16
Number of stations maintains inactive or closed units expected to be subject to final rule | Station	19
Nuclear decommissioning trust funds		8,051		6,946
Dominion Energy
Asset Retirement Obligations [Line Items]
Asset retirement obligation, liabilities incurred		2,600		1,900
Increase in property, plant, and equipment		505
Increase (decrease) in asset retirement obligation		1,100
Increase (decrease) in regulatory assets		536
Dominion Energy | Facility One
Asset Retirement Obligations [Line Items]
Increase in property, plant, and equipment		215
Dominion Energy | CCR Remediation Activities
Asset Retirement Obligations [Line Items]
Asset retirement obligation, liabilities incurred		828
D Virginia Electric And Power Company
Asset Retirement Obligations [Line Items]
Increase (decrease) in asset retirement obligation		(64)		552
Increase (decrease) in regulatory assets		(56)		471
Increase (decrease) in other deferred charges and other assets		(8)		81
D Virginia Electric And Power Company | Future Decommissioning Of Nuclear Facilities
Asset Retirement Obligations [Line Items]
Asset retirement obligation, liabilities incurred		1,400		1,000
D Virginia Electric And Power Company | D Cost Of Landfills And Beneficial Reuse
Asset Retirement Obligations [Line Items]
Asset retirement obligation, liabilities incurred		3,200		3,400
Virginia Electric and Power Company
Asset Retirement Obligations [Line Items]
Asset retirement obligation, liabilities incurred		469	[1]	9
Nuclear decommissioning trust funds		4,286		$ 3,716
Virginia Power
Asset Retirement Obligations [Line Items]
Number of stations maintains inactive or closed units expected to be subject to final rule | Station	12
Increase in property, plant, and equipment		152
Increase (decrease) in asset retirement obligation		420
Increase (decrease) in regulatory assets		234
Increase (decrease) in other deferred charges and other assets		34
Virginia Power | CCR Remediation Activities
Asset Retirement Obligations [Line Items]
Asset retirement obligation, liabilities incurred		$ 404
[1] Primarily reflects AROs related to CCR remediation as discussed below.

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Asset Retirement Obligations [Line Items]

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Increase (decrease) in other deferred charges and other assets.

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Amount of asset retirement obligations incurred during the period.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 410
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 1
-Subparagraph (c)(1)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147481850/410-20-50-1

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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://www.xbrl.org/2009/role/commonPracticeRef
-Topic 210
-SubTopic 10
-Name Accounting Standards Codification
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02(12))
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147480566/210-10-S99-1

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The increase (decrease) during the reporting period in the carrying amount of asset retirement obligations.

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Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Name Accounting Standards Codification
-Section 45
-Paragraph 28
-Subparagraph (a)
-SubTopic 10
-Topic 230
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482740/230-10-45-28

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Amount of increase (decrease) of long-lived, physical assets used in the normal conduct of business and not intended for resale. Examples include, but are not limited to, land, buildings, machinery and equipment, office equipment, furniture and fixtures, and computer equipment.

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