Asset Retirement Obligations (Narrative) (Detail) - USD ($) $ in Millions	12 Months Ended
Dec. 31, 2023	Dec. 31, 2022
Asset Retirement Obligations [Line Items]
Asset retirement obligation, liabilities incurred	$ 16	$ 138
Nuclear decommissioning trust funds	6,946	5,957
Dominion Energy
Asset Retirement Obligations [Line Items]
Asset retirement obligation, liabilities incurred	1,900	1,900
D Virginia Electric And Power Company
Asset Retirement Obligations [Line Items]
Increase in asset retirement obligation	552
Increase in regulatory assets	471
Increase in other deferred charges and other assets	81
D Virginia Electric And Power Company \| Future Decommissioning Of Nuclear Facilities
Asset Retirement Obligations [Line Items]
Asset retirement obligation, liabilities incurred	1,000	900
D Virginia Electric And Power Company \| D Cost Of Landfills And Beneficial Reuse
Asset Retirement Obligations [Line Items]
Asset retirement obligation, liabilities incurred	3,400	2,800
Virginia Electric and Power Company
Asset Retirement Obligations [Line Items]
Asset retirement obligation, liabilities incurred	9	132
Nuclear decommissioning trust funds	$ 3,716	$ 3,202

Asset Retirement Obligations [Line Items]

No definition available.

Name:	d_AssetRetirementObligationsLineItems
Namespace Prefix:	d_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

- Definition

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

+ References

No definition available.

+ Details

Name:	d_IncreaseDecreaseInOtherDeferredChargesAndOtherAssets
Namespace Prefix:	d_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Definition

Increase (decrease) in regulatory assets.

+ References

No definition available.

+ Details

Name:	d_IncreaseDecreaseInRegulatoryAssets
Namespace Prefix:	d_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Definition

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

+ Details

Name:	us-gaap_AssetRetirementObligationLiabilitiesIncurred
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Definition

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

+ Details

Name:	us-gaap_DecommissioningFundInvestments
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

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

+ References

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

+ Details

Name:	us-gaap_IncreaseDecreaseInAssetRetirementObligations
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Details

Name:	dei_LegalEntityAxis=d_DominionEnergyMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	dei_LegalEntityAxis=d_DVirginiaElectricAndPowerCompanyMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_EnvironmentalExitCostByPropertyAxis=d_FutureDecommissioningOfNuclearFacilitiesMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_EnvironmentalExitCostByPropertyAxis=d_DCostOfLandfillsAndBeneficialReuseMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	dei_LegalEntityAxis=d_VirginiaElectricAndPowerCompanyMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: