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Employee Benefit Plans (AOCI and Regulatory Assets and Liabilities that have Not been Recognized as Components of Periodic Benefit (Credit) Cost) (Parenthetical) (Detail) $ in Millions | 12 Months Ended
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Dec. 31, 2023 USD ($)
Assets and Liabilities Held for Sale |
Defined Benefit Plan Disclosure [Line Items] |
Amount in regulatory assets and liabilities | $ 173

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- Definition Regulatory assets and liabilities, pension and other postretirement benefit plans adjustment, net of tax. + References No definition available. + Details
Name: | d_RegulatoryAssetsAndLiabilitiesPensionAndOtherPostretirementBenefitPlansAdjustmentNetOfTax
Namespace Prefix: | d_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
Name: | us-gaap_DefinedBenefitPlanDisclosureLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Details
Name: | us-gaap_DisposalGroupClassificationAxis=us-gaap_DiscontinuedOperationsHeldforsaleMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |