v3.25.2
Related-Party Transactions (Narrative) (Detail) - USD ($)
 3 Months Ended 6 Months Ended
Jun. 30, 2025
Mar. 31, 2025
Jun. 30, 2024
Jun. 30, 2025
Jun. 30, 2024
Dec. 31, 2024
Related Party Transaction [Line Items]            
Borrowing Interest Charges $ 22,000,000   $ 5,000,000 $ 36,000,000 $ 6,000,000  
Dividend paid 569,000,000   $ 560,000,000 1,138,000,000 $ 1,119,000,000  
Virginia Electric and Power Company            
Related Party Transaction [Line Items]            
Affiliated current borrowings 177,000,000     177,000,000   $ 500,000,000 [1]
Outstanding borrowings, net of repayments, under money pool for non-regulated subsidiaries 0     0   0
Dividend declared           407,000,000
Dividend paid   $ 407,000,000        
Virginia Electric and Power Company | Affiliated Entity            
Related Party Transaction [Line Items]            
Derivative assets 19,000,000     19,000,000   19,000,000
Derivative liabilities 13,000,000     13,000,000   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 550,000,000     550,000,000   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 692,000,000     692,000,000   663,000,000
Virginia Electric and Power Company | Principal Owner | Short-Term Borrowing Arrangements            
Related Party Transaction [Line Items]            
Affiliated current borrowings $ 177,000,000     $ 177,000,000   $ 500,000,000
[1] Virginia Power’s Consolidated Balance Sheet at December 31, 2024 has been derived from the audited Consolidated Balance Sheet at that date.