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Investments (Narrative) (Detail) - USD ($)
$ in Millions
 1 Months Ended 3 Months Ended 6 Months Ended
Jul. 31, 2023
May 31, 2022
Mar. 31, 2022
Jun. 30, 2023
Aug. 31, 2022
Jun. 30, 2022
Mar. 31, 2022
Jun. 30, 2023
Jun. 30, 2022
Dec. 31, 2022
Schedule of Equity Method Investments [Line Items]                    
Earnings from equity method investees       $ 90   $ 83   $ 170 $ 163  
Net earnings (losses) from discontinued operations including noncontrolling interest [1]       (13)   1   (8) (18)  
Distributions received from investment               85 167  
Equity method affiliates includes cash and accrued amounts of contributions               48 90  
Equity method investment goodwill       9       9   $ 9
364-day term loan facility borrowings               2,500    
Income loss from continuing operations before income taxes extraordinary items noncontrolling interest       707   (569)   1,930 359  
Contributions to equity method affiliates               48 31  
Assets       7,977       7,977   9,850 [2]
Liabilities       $ 13,986       $ 13,986   13,450 [2]
2019 Series A Corporate Units                    
Schedule of Equity Method Investments [Line Items]                    
Short-term deposit   $ 2,000                
Wrangler Retail Gas Holdings LLC | Gas Supply, Inc.                    
Schedule of Equity Method Investments [Line Items]                    
Ownership interest percentage of limited partner interests             15.00%      
Cash consideration from sale of noncontrolling interest             $ 85      
Amount of gain from sale             11      
Amount of gain from sale, after tax             8      
Dominion Energy Virginia                    
Schedule of Equity Method Investments [Line Items]                    
Cash consideration from sale of noncontrolling interest     $ 120              
Amount of gain from sale             23      
Amount of gain from sale, after tax             16      
Limited partnership interest sale transaction, proceeds received     $ 60       $ 60      
Percentage ownership in total units     50.00% 50.00%     50.00% 50.00%    
Initial fair value     $ 60       $ 60      
Atlantic Coast Pipeline                    
Schedule of Equity Method Investments [Line Items]                    
Net earnings (losses) from discontinued operations including noncontrolling interest               $ (17) 4  
Contributions to equity method affiliates               41 0  
Atlantic Coast Pipeline | Other Current Liabilities                    
Schedule of Equity Method Investments [Line Items]                    
Liabilities from abandonment of project       $ 52       52   114
Cove Point                    
Schedule of Equity Method Investments [Line Items]                    
Distributions received from investment       $ 95   $ 85   $ 178 $ 161  
Transportation and storage services agreement period               20 years    
Cove Point | Cove Point | GT&S Transaction                    
Schedule of Equity Method Investments [Line Items]                    
Percentage of noncontrolling limited partnership interest retained       50.00%       50.00%    
Cove Point | BHE | Subsequent Event                    
Schedule of Equity Method Investments [Line Items]                    
364-day term loan facility borrowings $ 600                  
Cove Point | BHE | GT&S Transaction                    
Schedule of Equity Method Investments [Line Items]                    
Credit facility, outstanding amount       $ 2,300       $ 2,300    
Proceeds from settlement of related interest rate derivatives, fair value               218    
Cove Point | BHE | GT&S Transaction | Subsequent Event                    
Schedule of Equity Method Investments [Line Items]                    
Percentage of noncontrolling limited partnership interest retained 50.00%                  
Termination fee due receivable $ 150                  
Gain on sale of noncontrolling interest 650                  
Gain on sale of noncontrolling interest after tax 415                  
Cash consideration from sale of noncontrolling interest $ 3,300                  
Finite Lived Equity Method Investment Basis Difference                    
Schedule of Equity Method Investments [Line Items]                    
Carrying amount of investment that exceeded share of underlying equity       221       221   223
Equity method investment goodwill                   (1)
Finite Lived Equity Method Investment Basis Difference | Cove Point                    
Schedule of Equity Method Investments [Line Items]                    
Equity method investment goodwill       212       212   215
Trading Securities                    
Schedule of Equity Method Investments [Line Items]                    
Rabbi trust securities       $ 113       $ 113   $ 111
Minimum | 2019 Series A Corporate Units                    
Schedule of Equity Method Investments [Line Items]                    
Short-term deposit   1,600                
Maximum | 2019 Series A Corporate Units                    
Schedule of Equity Method Investments [Line Items]                    
Short-term deposit   2,000                
Series A Preferred Stock | 2019 Series A Corporate Units                    
Schedule of Equity Method Investments [Line Items]                    
Redemption obligation   $ 1,600                
Preferred stock dividend rate percentage   1.75%     1.75%          
[1] Includes income tax expense (benefit) of $4 million and $(2) million for the three months ended June 30, 2023 and 2022, respectively, and $3 million and $4 million for the six months ended June 30, 2023 and 2022, respectively.
[2] Dominion Energy’s Consolidated Balance Sheet at December 31, 2022 has been derived from the audited Consolidated Balance Sheet at that date.