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Investments (Narrative) (Detail) - USD ($)
 1 Months Ended 3 Months Ended 9 Months Ended
Jul. 31, 2023
May 31, 2022
Mar. 31, 2022
Sep. 30, 2023
Sep. 30, 2022
Aug. 31, 2022
Mar. 31, 2022
Sep. 30, 2023
Sep. 30, 2022
Dec. 31, 2022
Schedule of Equity Method Investments [Line Items]                    
Earnings from equity method investees               $ 7,000,000 $ 16,000,000  
Net earnings (losses) from discontinued operations including noncontrolling interest [1]       $ 554,000,000 $ (152,000,000)     105,000,000 (775,000,000)  
Distributions received from investment               241,000,000 268,000,000  
Equity method affiliates includes cash and accrued amounts of contributions               79,000,000 93,000,000  
Equity method investment goodwill       9,000,000       9,000,000   $ 9,000,000
Liabilities from abandonment of project       8,331,000,000       8,331,000,000   1,398,000,000 [2]
Contributions to equity method affiliates               79,000,000 34,000,000  
Income tax expense (benefit) from discontinued operations       1,200,000,000 53,000,000     1,300,000,000 185,000,000  
Facility Limit $ 600,000,000     6,000,000,000 [3]       6,000,000,000 [3]    
Noncurrent assets held for sale       $ 0       $ 0   18,802,000,000 [2]
364 Term loan facility                    
Schedule of Equity Method Investments [Line Items]                    
Credit facility, outstanding amount 2,200,000,000                  
364 Term Loan Facility One                    
Schedule of Equity Method Investments [Line Items]                    
Credit facility, outstanding amount $ 750,000,000                  
2019 Series A Corporate Units                    
Schedule of Equity Method Investments [Line Items]                    
Short-term deposit   $ 2,000,000,000                
Cove Point                    
Schedule of Equity Method Investments [Line Items]                    
Noncurrent assets held for sale                   2,700,000,000
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             $ 85,000,000      
Amount of gain from sale             11,000,000      
Amount of gain from sale, after tax             8,000,000      
Dominion Energy Virginia                    
Schedule of Equity Method Investments [Line Items]                    
Cash consideration from sale of noncontrolling interest     $ 120,000,000              
Amount of gain from sale             23,000,000      
Amount of gain from sale, after tax             16,000,000      
Limited partnership interest sale transaction, proceeds received     $ 60,000,000       $ 60,000,000      
Percentage ownership in total units     50.00% 50.00%     50.00% 50.00%    
Initial fair value     $ 60,000,000       $ 60,000,000      
Atlantic Coast Pipeline                    
Schedule of Equity Method Investments [Line Items]                    
Earnings from equity method investees               $ 16,000,000 (6,000,000)  
Net earnings (losses) from discontinued operations including noncontrolling interest               (235,000,000) (233,000,000)  
Contributions to equity method affiliates               70,000,000 0  
Atlantic Coast Pipeline | Other Current Liabilities                    
Schedule of Equity Method Investments [Line Items]                    
Liabilities from abandonment of project       $ 25,000,000       25,000,000   $ 114,000,000
Cove Point                    
Schedule of Equity Method Investments [Line Items]                    
Distributions received from investment       49,000,000 98,000,000     $ 227,000,000 259,000,000  
Transportation and storage services agreement period               20 years    
Discontinued operations, interest expense       69,000,000       $ 120,000,000    
Discontinued operations, interest income         (65,000,000)       (205,000,000)  
Income tax expense (benefit) from discontinued operations       7,000,000 32,000,000     31,000,000 93,000,000  
Cove Point | Discontinued operations                    
Schedule of Equity Method Investments [Line Items]                    
Earnings from equity method investees       $ 52,000,000 $ 91,000,000     $ 218,000,000 $ 238,000,000  
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%   50.00%
Cove Point | East Ohio, PSNC and Questar Gas | GT&S Transaction                    
Schedule of Equity Method Investments [Line Items]                    
Percentage of noncontrolling limited partnership interest retained       50.00%       50.00%    
Cove Point | BHE | GT&S Transaction                    
Schedule of Equity Method Investments [Line Items]                    
Percentage of noncontrolling limited partnership interest retained 50.00%                  
Cash consideration from sale of noncontrolling interest $ 3,300,000,000                  
Amount of gain from sale 626,000,000                  
Amount of gain from sale, after tax 348,000,000                  
Proceeds from settlement of related interest rate derivatives, fair value $ 199,000,000                  
Finite Lived Equity Method Investment Basis Difference                    
Schedule of Equity Method Investments [Line Items]                    
Carrying amount of investment that exceeded share of underlying equity       $ 12,000,000       $ 12,000,000   $ 223,000,000
Equity method investment goodwill       3,000,000       3,000,000   (1,000,000)
Finite Lived Equity Method Investment Basis Difference | Cove Point                    
Schedule of Equity Method Investments [Line Items]                    
Equity method investment goodwill                   215,000,000
Trading Securities                    
Schedule of Equity Method Investments [Line Items]                    
Rabbi trust securities       $ 119,000,000       $ 119,000,000   $ 111,000,000
Minimum | 2019 Series A Corporate Units                    
Schedule of Equity Method Investments [Line Items]                    
Short-term deposit   1,600,000,000                
Maximum | 2019 Series A Corporate Units                    
Schedule of Equity Method Investments [Line Items]                    
Short-term deposit   2,000,000,000                
Series A Preferred Stock | 2019 Series A Corporate Units                    
Schedule of Equity Method Investments [Line Items]                    
Redemption obligation   $ 1,600,000,000                
Preferred stock dividend rate percentage   1.75%       1.75%        
[1] Includes income tax expense of $1.2 billion and $53 million for the three months ended September 30, 2023 and 2022, respectively, and $1.3 billion and $185 million for the nine months ended September 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 and recast for certain events as discussed in Note 1.
[3] This credit facility matures in June 2026, with the potential to be extended by the borrowers to June 2028, and can be used by the borrowers under the credit facility to support bank borrowings and the issuance of commercial paper, as well as to support up to a combined $2.0 billion of letters of credit.