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Variable Interest Entities - (Narrative) (Detail) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2023
Sep. 30, 2022
Sep. 30, 2023
Sep. 30, 2022
Dec. 31, 2022
Variable Interest Entity [Line Items]          
Payable to affiliates [1] $ 1,655   $ 1,655   $ 1,697 [2]
Virginia Electric and Power Company          
Variable Interest Entity [Line Items]          
Payable to affiliates 1,213   1,213   1,176 [3]
Variable Interest Entity, Not Primary Beneficiary | Virginia Electric and Power Company | DES          
Variable Interest Entity [Line Items]          
Shared Services Purchased 113 $ 96 339 $ 290  
Variable Interest Entity, Not Primary Beneficiary | Virginia Electric and Power Company | DES | Related Party          
Variable Interest Entity [Line Items]          
Payable to affiliates $ 29   $ 29   $ 28
Variable Interest Entity, Not Primary Beneficiary | Cove Point          
Variable Interest Entity [Line Items]          
Percentage of variable interest sold 50.00%   50.00%    
[1] See Note 10 for amounts attributable to related parties.
[2] Dominion Energy’s Consolidated Balance Sheet at December 31, 2022 has been derived from the audited Consolidated Balance Sheet at that date and recast for certain events as discussed in Note 1.
[3] Virginia Power’s Consolidated Balance Sheet at December 31, 2022 has been derived from the audited Consolidated Balance Sheet at that date.