Asset retirement obligation liabilities incurred after tax.

No definition available.

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

- Definition

Costs incurred asset retirement obligation incurred after tax.

+ References

No definition available.

+ Details

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

- Definition

Increase Decrease In Earnings Per Share

+ References

No definition available.

+ Details

Name:	d_IncreaseDecreaseInEarningsPerShare
Namespace Prefix:	d_
Data Type:	dtr-types:perShareItemType
Balance Type:	na
Period Type:	duration

- Definition

[Line Items] for Significant Accounting Policies [Table]

+ References

No definition available.

+ Details

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

- Definition

Utilities operating expense, increase (decrease) in depreciation and amortization.

+ References

No definition available.

+ Details

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

- Definition

Utilities operating expense, increase (decrease) in depreciation and amortization, after tax.

+ References

No definition available.

+ Details

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

- Definition

Amount of asset retirement obligations incurred during the period.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 410
-SubTopic 20
-Section 50
-Paragraph 1
-Subparagraph (c)(1)
-URI https://asc.fasb.org/extlink&oid=6392692&loc=d3e7535-110849

+ Details

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

- Definition

Amount of asset retirement obligations (ARO) costs incurred (whether capitalized or charged to expense) during the period.

+ References

+ Details

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

- Definition

The equity interest of noncontrolling shareholders, partners or other equity holders in consolidated entity.

+ References

No definition available.

+ Details

Name:	us-gaap_MinorityInterestOwnershipPercentageByNoncontrollingOwners
Namespace Prefix:	us-gaap_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	instant

- Details

Name:	us-gaap_IncomeStatementLocationAxis=d_OtherOperationsAndMaintenanceExpenseMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_ChangeInAccountingEstimateByTypeAxis=d_ChangeInDepreciationRatesFromNewDepreciationStudyMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	srt_StatementScenarioAxis=srt_ScenarioForecastMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

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

- Details

Name:	us-gaap_RegulatoryAssetAxis=d_CoalAndOilFiredGeneratingUnitsMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_BusinessAcquisitionAxis=d_FourBrothersAndThreeCedarsMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	srt_OwnershipAxis=d_DominionEnergyMidstreamPartnersLPMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

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

- Details

Name:	us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis=d_NonregulatedSolarProjectsMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

Significant Accounting Policies (Narrative) (Detail) - USD ($) $ / shares in Units, $ in Millions	3 Months Ended		9 Months Ended	12 Months Ended
	Sep. 30, 2022	Jun. 30, 2021	Sep. 30, 2022	Dec. 31, 2022
Other Operations and Maintenance
Significant Accounting Policies [Line Items]
Asset retirement obligation, liabilities incurred		$ 44
Asset retirement obligation, liabilities incurred after tax		$ 35
Change in Depreciation Rates from New Depreciation Study
Significant Accounting Policies [Line Items]
Increase in EPS	$ 0.01		$ 0.04
Change in Depreciation Rates from New Depreciation Study \| Forecast
Significant Accounting Policies [Line Items]
Increase in EPS				$ 0.05
Virginia Electric and Power Company \| Coal And Oil Fired Generating Units
Significant Accounting Policies [Line Items]
Charges recorded with dismantling	$ 18		$ 60
Charges recorded with dismantling after tax	14		45
Virginia Electric and Power Company \| Change in Depreciation Rates from New Depreciation Study
Significant Accounting Policies [Line Items]
Increase (decrease) in depreciation expense	(15)		(45)
Increase (decrease) in depreciation expense, after tax	$ (11)		$ (33)
Virginia Electric and Power Company \| Change in Depreciation Rates from New Depreciation Study \| Forecast
Significant Accounting Policies [Line Items]
Increase (decrease) in depreciation expense				$ (60)
Increase (decrease) in depreciation expense, after tax				$ (45)
Four Brothers And Three Cedars \| Dominion Energy Midstream Partners, LP \| Terra Nova Renewable Partners \| Nonregulated Solar Projects
Significant Accounting Policies [Line Items]
Percentage of equity interest sold to noncontrolling interest owners	33.00%		33.00%