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Investments (Narrative) (Detail) - USD ($)
 3 Months Ended 9 Months Ended 12 Months Ended
Sep. 30, 2024
Sep. 30, 2023
Sep. 30, 2024
Sep. 30, 2023
Dec. 31, 2023
Feb. 29, 2024
Schedule of Equity Method Investments [Line Items]            
Earnings (loss) from equity method investees       $ 7,000,000    
Net earnings (losses) from discontinued operations including noncontrolling interest [1] $ 13,000,000 $ 541,000,000 $ (182,000,000) 92,000,000    
Distributions received from investment     138,000,000 241,000,000    
Equity method affiliates includes cash and accrued amounts of contributions     6,000,000 79,000,000    
Current liabilities 0   0   $ 8,885,000,000 [2]  
Contributions to equity method affiliates     14,000,000 79,000,000    
Income tax expense (benefit) from discontinued operations (10,000,000) 1,200,000,000 22,000,000 1,300,000,000    
Investment company received distribution amount           $ 126,000,000
Discontinued operations            
Schedule of Equity Method Investments [Line Items]            
Net earnings (losses) from discontinued operations including noncontrolling interest     11,000,000 (235,000,000)    
Atlantic Coast Pipeline            
Schedule of Equity Method Investments [Line Items]            
Earnings (loss) from equity method investees   (1,000,000) (12,000,000) 16,000,000    
Contributions to equity method affiliates       70,000,000    
Atlantic Coast Pipeline | Other Current Liabilities            
Schedule of Equity Method Investments [Line Items]            
Current liabilities 10,000,000   10,000,000   4,000,000  
Cove Point            
Schedule of Equity Method Investments [Line Items]            
Distributions received from investment   49,000,000   227,000,000    
Discontinued operations, interest expense   69,000,000   120,000,000    
Income tax expense (benefit) from discontinued operations   7,000,000   31,000,000    
Cove Point | Discontinued operations            
Schedule of Equity Method Investments [Line Items]            
Earnings (loss) from equity method investees   $ 52,000,000   $ 218,000,000    
Finite Lived Equity Method Investment Basis Difference            
Schedule of Equity Method Investments [Line Items]            
Carrying amount of investment that exceeded share of underlying equity 7,000,000   7,000,000   18,000,000  
Equity method investment goodwill         9,000,000  
Capitalized interest     7,000,000   3,000,000  
Trading Securities            
Schedule of Equity Method Investments [Line Items]            
Rabbi trust securities 152,000,000   152,000,000   $ 119,000,000  
Maximum            
Schedule of Equity Method Investments [Line Items]            
Earnings (loss) from equity method investees     $ 1,000,000      
Maximum | Atlantic Coast Pipeline            
Schedule of Equity Method Investments [Line Items]            
Earnings (loss) from equity method investees $ (1,000,000)          
[1] Includes income tax expense (benefit) of $(10) million and $1.2 billion for the three months ended September 30, 2024 and 2023, respectively, and $22 million and $1.3 billion for the nine months ended September 30, 2024 and 2023, respectively.
[2] Dominion Energy’s Consolidated Balance Sheet at December 31, 2023 has been derived from the audited Consolidated Balance Sheet at that date.