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v3.23.3

Fair Value Measurements (Financial Instruments' Carrying Amounts and Fair Values) (Parenthetical) (Detail) | 9 Months Ended
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Sep. 30, 2023
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |
Supplemental line of credit facility borrowings expiration period | 1 year

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- Definition Supplemental line of credit facility expiration period. + References No definition available. + Details
Name: | d_SupplementalLineOfCreditFacilityExpirationPeriod
Namespace Prefix: | d_
Data Type: | xbrli:durationItemType
Balance Type: | na
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_FairValueBalanceSheetGroupingFinancialStatementCaptionsLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration