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Related-Party Transactions (Narrative) (Detail) - USD ($)
 3 Months Ended 9 Months Ended
Sep. 30, 2025
Mar. 31, 2025
Sep. 30, 2024
Sep. 30, 2025
Sep. 30, 2024
Dec. 31, 2024
Related Party Transaction [Line Items]            
Borrowing Interest Charges $ 4,000,000   $ 17,000,000 $ 40,000,000 $ 23,000,000  
Dividend paid 570,000,000   $ 559,000,000 1,708,000,000 $ 1,678,000,000  
Virginia Electric and Power Company            
Related Party Transaction [Line Items]            
Affiliated current borrowings 0     0   $ 500,000,000 [1]
Affiliated lease payables 221,000,000     221,000,000    
Outstanding borrowings, net of repayments, under money pool for non-regulated subsidiaries 0     $ 0   0
Dividend declared           407,000,000
Lease agreement maturity period       20 months    
Dividend paid   $ 407,000,000        
Virginia Electric and Power Company | Other Current Liabilities            
Related Party Transaction [Line Items]            
Affiliated lease payables 138,000,000     $ 138,000,000    
Virginia Electric and Power Company | Other Deferred Credits and Other Liabilities            
Related Party Transaction [Line Items]            
Affiliated lease payables 83,000,000     83,000,000    
Virginia Electric and Power Company | Affiliated Entity            
Related Party Transaction [Line Items]            
Derivative assets 24,000,000     24,000,000   19,000,000
Derivative liabilities 15,000,000     15,000,000   17,000,000
Virginia Electric and Power Company | Affiliated Entity | Pension Benefits | Amounts Associated With Dominion Pension Plan            
Related Party Transaction [Line Items]            
Other deferred credits and other liabilities 572,000,000     572,000,000   505,000,000
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 707,000,000     707,000,000   663,000,000
Virginia Electric and Power Company | Principal Owner | Short-Term Borrowing Arrangements            
Related Party Transaction [Line Items]            
Affiliated current borrowings           $ 500,000,000
Virginia Electric and Power Company | Principal Owner | Short-Term Borrowing Arrangements | Maximum            
Related Party Transaction [Line Items]            
Affiliated current borrowings $ 1,000,000     $ 1,000,000    
[1] Virginia Power’s Consolidated Balance Sheet at December 31, 2024 has been derived from the audited Consolidated Balance Sheet at that date.