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Derivatives and Hedge Accounting Activities (Fair Value of Derivatives) (Parenthetical) (Detail) - Held for Sale $ in Millions | Dec. 31, 2024 USD ($)
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Derivatives, Fair Value [Line Items] |
Derivative asset held for sale, current | $ 54
Derivative liabilities held for sale, current | $ 30

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- Definition Disposal group including discontinued operation derivative assets current. + References No definition available. + Details
Name: | d_DisposalGroupIncludingDiscontinuedOperationDerivativeAssetsCurrent
Namespace Prefix: | d_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Definition Disposal group including discontinued operation derivative liabilities current. + References No definition available. + Details
Name: | d_DisposalGroupIncludingDiscontinuedOperationDerivativeLiabilitiesCurrent
Namespace Prefix: | d_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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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_DerivativesFairValueLineItems
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: |