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Commitments and Contingencies (Charitable Commitments) (Detail) $ in Millions | 12 Months Ended
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Dec. 31, 2020 USD ($)
Other Deferred Credits and Other Liabilities |
Recorded Unconditional Purchase Obligation [Line Items] |
Charity commitments | $ 73
Other Income |
Recorded Unconditional Purchase Obligation [Line Items] |
Charity expenses | $ 80

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- Definition Charity commitments. + References No definition available. + Details
Name: | d_CharityCommitments
Namespace Prefix: | d_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition Charity expenses. + References No definition available. + Details
Name: | d_CharityExpenses
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_RecordedUnconditionalPurchaseObligationLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Details
Name: | us-gaap_BalanceSheetLocationAxis=d_OtherDeferredCreditsAndOtherLiabilitiesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_IncomeStatementLocationAxis=us-gaap_OtherNonoperatingIncomeExpenseMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |