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Significant Accounting Policies (Checks the Outstanding Accounts Payable but not yet Presented for Payment and Recorded) (Detail) - USD ($) $ in Millions | Dec. 31, 2023 | Dec. 31, 2022
--- | --- | ---
Accounts Payable [Line Items] |  |  |
Accounts payable for checks outstanding | [1] | $ 54 | $ 35
Virginia Electric and Power Company |  |  |
Accounts Payable [Line Items] |  |  |
Accounts payable for checks outstanding |  | $ 44 | $ 21
[1] | In addition, at December 31, 2023 and 2022, Dominion Energy had $19 million and $14 million, respectively, of checks outstanding but not yet presented for payment included in current liabilities held for sale.

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

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- Details
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Namespace Prefix: |
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Balance Type: |
Period Type: |