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Variable Interest Entities - (Narrative) (Detail) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2024
Sep. 30, 2023
Sep. 30, 2024
Sep. 30, 2023
Dec. 31, 2023
Variable Interest Entity [Line Items]          
Payable to affiliates [1] $ 1,796   $ 1,796   $ 1,732 [2]
Regulatory assets-current [3] 1,030   1,030   1,309 [2]
Other current assets [3] 550   550   459 [2]
Regulatory assets-noncurrent [3] 8,352   8,352   8,356 [2]
Securities due within one year [3] 1,820   1,820   6,589 [2]
Accrued interest, payroll and taxes [3] 1,354   1,354   1,075 [2]
Long-term debt 37,101   37,101   33,248 [2]
Virginia Electric and Power Company          
Variable Interest Entity [Line Items]          
Payable to affiliates 1,328   1,328   1,285 [4]
Regulatory assets-current [5] 751   751   868 [4]
Other current assets [5] 271   271   141 [4]
Regulatory assets-noncurrent [5] 4,561   4,561   4,317 [4]
Securities due within one year 540   540   381 [4]
Accrued interest, payroll and taxes 493   493   293 [4]
Long-term debt 20,104   20,104   17,115 [4]
Variable Interest Entity Not Primary Beneficiary | Virginia Electric and Power Company          
Variable Interest Entity [Line Items]          
Regulatory assets-current 119   119    
Other current assets 100   100    
Regulatory assets-noncurrent 1,100   1,100    
Securities due within one year 146   146    
Accrued interest, payroll and taxes 40   40    
Long-term debt 1,100   1,100    
Variable Interest Entity Not Primary Beneficiary | Virginia Electric and Power Company | DES          
Variable Interest Entity [Line Items]          
Shared Services Purchased 125 $ 113 368 $ 339  
Variable Interest Entity Not Primary Beneficiary | Virginia Electric and Power Company | DES | Related Party          
Variable Interest Entity [Line Items]          
Payable to affiliates $ 33   $ 33   $ 32
[1] See Note 10 for amounts attributable to related parties.
[2] Dominion Energy’s Consolidated Balance Sheet at December 31, 2023 has been derived from the audited Consolidated Balance Sheet at that date.
[3] See Note 15 for amounts attributable to VIEs.
[4] Virginia Power’s Consolidated Balance Sheet at December 31, 2023 has been derived from the audited Consolidated Balance Sheet at that date.
[5] See Note 15 for amounts attributable to VIEs.