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Significant Accounting Policies (Checks the Outstanding Accounts Payable but not yet Presented for Payment and Recorded) (Parenthetical) (Detail) - USD ($) $ in Millions | Dec. 31, 2023 | Dec. 31, 2022
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Accounts Payable [Line Items] |  |
Accounts payable checks current liabilities held for sale | $ 19 | $ 14

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- Definition Accounts payable checks current liabilities held for sale. + References No definition available. + Details
Name: | d_AccountsPayableChecksCurrentLiabilitiesHeldForSale
Namespace Prefix: | d_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition Accounts Payable [Line Items] + References No definition available. + Details
Name: | d_AccountsPayableLineItems
Namespace Prefix: | d_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration