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Investments (Investments Under Equity Method of Accounting) (Detail) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Schedule of Equity Method Investments [Line Items]    
Investment in equity method affiliates $ 138 $ 311
Align RNG, LLC    
Schedule of Equity Method Investments [Line Items]    
Equity Method Investment, Ownership Percentage 50.00%  
Investment in equity method affiliates $ 91 80
Description Renewable natural gas  
Dominion Energy Virginia    
Schedule of Equity Method Investments [Line Items]    
Equity Method Investment, Ownership Percentage 50.00%  
Investment in equity method affiliates $ 27 172
Description Military electric and gas  
Other Investment    
Schedule of Equity Method Investments [Line Items]    
Investment in equity method affiliates [1] $ 20 $ 59 [2]
Ownership% [1] various  
[1] Dominion Energy’s Consolidated Balance Sheets include a liability associated with its investment in Atlantic Coast Pipeline of $7 million and $4 million at December 31, 2024 and 2023, respectively, presented in other current liabilities. See discussion below for additional information.
[2] Dominion Energy’s Consolidated Balance Sheets includes balances presented in assets held for sale of $43 million for December 31, 2023.