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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, 2024
Dec. 31, 2023
Accounts Payable [Line Items]    
Accounts payable for checks outstanding [1] $ 52 $ 54
Virginia Electric and Power Company    
Accounts Payable [Line Items]    
Accounts payable for checks outstanding $ 23 $ 44
[1] In addition, at December 31, 2023, Dominion Energy had $19 million of checks outstanding but not yet presented for payment included in liabilities held for sale.