v3.26.3
Variable Interest Entities (Narrative) (Detail) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2026
Sep. 30, 2025
Sep. 30, 2026
Sep. 30, 2025
Dec. 31, 2025
Oct. 31, 2024
Variable Interest Entity [Line Items]            
Payable to affiliates [1],[2] $ 2,215   $ 2,215   $ 2,454 [3]  
Virginia Electric and Power Company            
Variable Interest Entity [Line Items]            
Payable to affiliates [4],[5] $ 1,736   $ 1,736   1,900 [6]  
Virginia Electric and Power Company | CVOW Commercial Project            
Variable Interest Entity [Line Items]            
Equity Method Investment, Ownership Percentage 50.00%   50.00%     50.00%
Variable Interest Entity Not Primary Beneficiary | Virginia Electric and Power Company | DES            
Variable Interest Entity [Line Items]            
Shared Services Purchased $ 171 $ 145 $ 522 $ 442    
Variable Interest Entity Not Primary Beneficiary | Virginia Electric and Power Company | DES | Related Party            
Variable Interest Entity [Line Items]            
Payable to affiliates $ 58   $ 58   $ 46  
[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.