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Significant Accounting Policies (Schedule of Supplemental Cash Flow Information) (Parenthetical) (Detail) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
Schedule Of Supplemental Cash Flow Information [Line Items] |  |  |
Financing leases | $ 44 | $ 34 | $ 47
Operating leases | 211 | 110 | 49
Virginia Electric and Power Company |  |  |
Schedule Of Supplemental Cash Flow Information [Line Items] |  |  |
Financing leases | 30 | 26 | 37
Operating leases | $ 173 | $ 90 | $ 42

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- Definition Financing leases. + References No definition available. + Details
Name: | d_FinancingLeases
Namespace Prefix: | d_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Definition Operating leases. + References No definition available. + Details
Name: | d_OperatingLeases
Namespace Prefix: | d_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Definition Schedule of supplemental cash flow information. + References No definition available. + Details
Name: | d_ScheduleOfSupplementalCashFlowInformationLineItems
Namespace Prefix: | d_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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