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Related-Party Transactions (Narrative) (Detail) - USD ($)
 1 Months Ended 3 Months Ended 9 Months Ended 12 Months Ended
Oct. 31, 2024
Sep. 30, 2024
Sep. 30, 2023
Sep. 30, 2024
Sep. 30, 2023
Dec. 31, 2023
Related Party Transaction [Line Items]            
Amounts due to Dominion, noncurrent   $ 1,296,000,000   $ 1,296,000,000   $ 1,755,000,000 [1]
Borrowing Interest Charges   17,000,000 $ 27,000,000 23,000,000 $ 72,000,000  
Dividend paid   559,000,000 $ 559,000,000 1,678,000,000 $ 1,674,000,000  
Virginia Electric and Power Company            
Related Party Transaction [Line Items]            
Amounts due to Dominion, noncurrent   1,096,000,000   1,096,000,000   1,125,000,000 [2]
Payable to affiliates   633,000,000   633,000,000   500,000,000 [2]
Outstanding borrowings, net of repayments, under money pool for non-regulated subsidiaries   $ 0   $ 0   $ 0
Issuance of stock (in shares)   0 0 0 0  
Dividend paid $ 600,000,000          
Commencing Period           20 months
Lease commencement term           2025-08
Related party transaction costs           $ 240,000,000
Cost of Revenue, Related Party [Extensible Enumeration]           Affiliated Entity
Virginia Electric and Power Company | Affiliated Entity            
Related Party Transaction [Line Items]            
Derivative assets   $ 11,000,000   $ 11,000,000   $ 1,000,000
Derivative liabilities   43,000,000   43,000,000   79,000,000
Virginia Electric and Power Company | Affiliated Entity | Pension Benefits | Amounts Associated With Dominion Pension Plan            
Related Party Transaction [Line Items]            
Amounts due to Dominion, noncurrent   493,000,000   493,000,000   456,000,000
Virginia Electric and Power Company | Affiliated Entity | Medical Coverage for Local retirees | Amounts Associated with the Dominion Retiree Health and Welfare Plan            
Related Party Transaction [Line Items]            
Amounts due from Dominion, noncurrent   640,000,000   640,000,000   584,000,000
Virginia Electric and Power Company | Principal Owner | Short-Term Borrowing Arrangements            
Related Party Transaction [Line Items]            
Payable to affiliates   $ 633,000,000   $ 633,000,000   $ 500,000,000
[1] Dominion Energy’s Consolidated Balance Sheet at December 31, 2023 has been derived from the audited Consolidated Balance Sheet at that date.
[2] Virginia Power’s Consolidated Balance Sheet at December 31, 2023 has been derived from the audited Consolidated Balance Sheet at that date.