v3.26.3
Related-Party Transactions (Narrative) (Detail) - USD ($)
 1 Months Ended 3 Months Ended 9 Months Ended
Sep. 30, 2025
Sep. 30, 2026
Jun. 30, 2026
Sep. 30, 2025
Sep. 30, 2026
Sep. 30, 2025
Dec. 31, 2025
Related Party Transaction [Line Items]              
Other current liabilities [1],[2]   $ 2,215,000,000     $ 2,215,000,000   $ 2,454,000,000 [3]
Total deferred credits and other liabilities   30,294,000,000     30,294,000,000   27,921,000,000 [3]
Borrowing Interest Charges   11,000,000   $ 4,000,000 36,000,000 $ 40,000,000  
Virginia Electric and Power Company              
Related Party Transaction [Line Items]              
Other current liabilities [4],[5]   1,736,000,000     1,736,000,000   1,900,000,000 [6]
Total deferred credits and other liabilities   21,156,000,000     21,156,000,000   19,001,000,000 [6]
Affiliated current borrowings   403,000,000     403,000,000   1,173,000,000 [6]
Outstanding borrowings, net of repayments, under money pool for non-regulated subsidiaries   0     0   0
Lease agreement maturity period     15 years        
Other deferred charges and other assets of right-of-use asset   269,000,000     269,000,000    
Virginia Electric and Power Company | Affiliated Entity              
Related Party Transaction [Line Items]              
Derivative assets   9,000,000     9,000,000   22,000,000
Derivative liabilities   13,000,000     13,000,000   12,000,000
Affiliated lease payables   178,000,000     178,000,000   188,000,000
Lease agreement maturity period 20 months            
Other deferred charges and other assets of right-of-use asset   177,000,000     177,000,000   185,000,000
Virginia Electric and Power Company | Affiliated Entity | CVOW Commercial Project              
Related Party Transaction [Line Items]              
Capitalized affiliates lease cost   28,000,000   $ 11,000,000 100,000,000 $ 11,000,000  
Virginia Electric and Power Company | Affiliated Entity | Location, Statement of Financial Position, Balance [Axis]: us-gaap:DeferredCreditsAndOtherLiabilities              
Related Party Transaction [Line Items]              
Affiliated lease payables   37,000,000     37,000,000   47,000,000
Virginia Electric and Power Company | Affiliated Entity | Location, Statement of Financial Position, Balance [Axis]: us-gaap:OtherLiabilitiesCurrent              
Related Party Transaction [Line Items]              
Affiliated lease payables   141,000,000     141,000,000   141,000,000
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   691,000,000     691,000,000   594,000,000
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   776,000,000     776,000,000   729,000,000
Virginia Electric and Power Company | Principal Owner | Short-Term Borrowing Arrangements              
Related Party Transaction [Line Items]              
Affiliated current borrowings   $ 403,000,000,000     $ 403,000,000,000   $ 1,200,000,000
[1] See Note 14 for amounts attributable to VIEs.
[2] See Note 9 for amounts attributable to related parties.
[3] Dominion Energy’s Consolidated Balance Sheet at December 31, 2025 has been derived from the audited Consolidated Balance Sheet at that date.
[4] See Note 14 for amounts attributable to VIEs.
[5] See Note 18 for amounts attributable to affiliates.
[6] Virginia Power’s Consolidated Balance Sheet at December 31, 2025 has been derived from the audited Consolidated Balance Sheet at that date.