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Variable Interest Entities (Narrative) (Detail) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2025
Sep. 30, 2024
Sep. 30, 2025
Sep. 30, 2024
Dec. 31, 2024
Variable Interest Entity [Line Items]          
Payable to affiliates [1],[2] $ 1,655   $ 1,655   $ 2,084 [3]
Virginia Electric and Power Company          
Variable Interest Entity [Line Items]          
Payable to affiliates [4],[5] 1,382   1,382   $ 1,549 [6]
Virginia Electric and Power Company | CVOW Commercial Project          
Variable Interest Entity [Line Items]          
Equity Method Investment, Ownership Percentage         50.00%
Variable Interest Entity Not Primary Beneficiary | Virginia Electric and Power Company | DES          
Variable Interest Entity [Line Items]          
Shared Services Purchased 145 $ 125 442 $ 368  
Variable Interest Entity Not Primary Beneficiary | Virginia Electric and Power Company | DES | Related Party          
Variable Interest Entity [Line Items]          
Payable to affiliates 43   43   $ 38
Variable Interest Entity Not Primary Beneficiary | OSWP [Member]          
Variable Interest Entity [Line Items]          
Payable to affiliates $ 7   $ 7   $ 0
[1] See Note 10 for amounts attributable to related parties.
[2] See Note 15 for amounts attributable to VIEs.
[3] Dominion Energy’s Consolidated Balance Sheet at December 31, 2024 has been derived from the audited Consolidated Balance Sheet at that date.
[4] See Note 15 for amounts attributable to VIEs.
[5] See Note 19 for amounts attributable to affiliates.
[6] Virginia Power’s Consolidated Balance Sheet at December 31, 2024 has been derived from the audited Consolidated Balance Sheet at that date.