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Investments (Narrative) (Detail)
 1 Months Ended 3 Months Ended 12 Months Ended
Feb. 22, 2022
USD ($)
Nov. 30, 2020
USD ($)
Dec. 31, 2021
USD ($)
Nov. 30, 2020
Sep. 30, 2020
USD ($)
Dec. 31, 2019
USD ($)
Oct. 31, 2019
Oct. 31, 2017
USD ($)
Sep. 30, 2014
mi
Mar. 31, 2019
USD ($)
Dec. 31, 2021
USD ($)
Dec. 31, 2020
USD ($)
Dec. 31, 2019
USD ($)
Dec. 31, 2018
USD ($)
Jun. 30, 2021
USD ($)
Jul. 31, 2020
USD ($)
Mar. 31, 2020
USD ($)
Schedule of Equity Method Investments [Line Items]                                  
Earnings from equity method investees                     $ 276,000,000 $ 40,000,000 $ 8,000,000        
Net income (loss) from discontinued operations including noncontrolling interest [1],[2]                     641,000,000 (1,878,000,000) 716,000,000        
Distributions received from investment                     328,000,000 102,000,000 38,000,000        
Equity method investment goodwill     $ 27,000,000               27,000,000 27,000,000          
Income loss from continuing operations before income taxes extraordinary items noncontrolling interest                     3,098,000,000 1,411,000,000 869,000,000        
Contributions to equity method affiliates                     1,021,000,000 148,000,000 209,000,000        
Current liabilities                       625,000,000          
Debt maximum borrowing capacity [3]     6,000,000,000               6,000,000,000 6,000,000,000          
Guarantee liability [4]     3,923,000,000               3,923,000,000            
Retained earnings     5,373,000,000               5,373,000,000 4,189,000,000          
Operating revenue from contracts with customers                     14,170,000,000 13,752,000,000 13,745,000,000        
Income tax expense   $ 336,000,000 173,000,000               425,000,000 83,000,000 209,000,000        
Sale of interest in Cove Point                         1,862,000,000        
Assets     7,269,000,000               7,269,000,000 6,886,000,000          
Liabilities     8,673,000,000               8,673,000,000 10,843,000,000          
Retail Energy Marketing Operations                                  
Schedule of Equity Method Investments [Line Items]                                  
Assets                       63,000,000          
Liabilities                       15,000,000          
Revolving Credit Facility                                  
Schedule of Equity Method Investments [Line Items]                                  
Debt maximum borrowing capacity                             $ 6,000,000,000.0    
Finite Lived Equity Method Investment Basis Difference                                  
Schedule of Equity Method Investments [Line Items]                                  
Carrying amount of investment that exceeded share of underlying equity     244,000,000               244,000,000 213,000,000          
Unfunded commitments     (4,000,000)               (4,000,000) (41,000,000)          
Atlantic Coast Pipeline                                  
Schedule of Equity Method Investments [Line Items]                                  
Earnings from equity method investees                     (20,000,000) (2,300,000,000) 117,000,000        
Net income (loss) from discontinued operations including noncontrolling interest                     (20,000,000) (2,300,000,000) 117,000,000        
Contributions to equity method affiliates                     965,000,000 107,000,000 186,000,000        
Cost to acquire equity method investments                                 $ 184,000,000
Equity in earnings (losses) on investments after tax                     (14,000,000) (1,800,000,000) 118,000,000        
Atlantic Coast Pipeline | Financial Guarantee                                  
Schedule of Equity Method Investments [Line Items]                                  
Guarantee liability                       6,000,000          
Atlantic Coast Pipeline | Revolving Credit Facility                                  
Schedule of Equity Method Investments [Line Items]                                  
Debt maximum borrowing capacity               $ 3,400,000,000               $ 1,900,000,000  
Credit facility, maturity date               Oct. 31, 2021                  
Credit facility, amount borrowed                       1,800,000,000          
Atlantic Coast Pipeline | Revolving Credit Facility | Financial Guarantee | Cumulative Effect, Period of Adoption, Adjustment                                  
Schedule of Equity Method Investments [Line Items]                                  
Retained earnings                       48,000,000          
Atlantic Coast Pipeline | Other Current Liabilities                                  
Schedule of Equity Method Investments [Line Items]                                  
Current liabilities     $ 113,000,000               $ 113,000,000 1,100,000,000          
Atlantic Coast Pipeline | Dominion Energy Gas Holdings, LLC                                  
Schedule of Equity Method Investments [Line Items]                                  
Ownership percentage acquired                                 5.00%
Percentage ownership in total units                                 53.00%
Atlantic Coast Pipeline | DETI                                  
Schedule of Equity Method Investments [Line Items]                                  
Operating revenue from contracts with customers                       49,000,000 $ 103,000,000        
Atlantic Coast Pipeline | Pipelines | Jointly Owned Natural Gas Pipeline | Distribution                                  
Schedule of Equity Method Investments [Line Items]                                  
Length of natural gas pipeline (in miles) | mi                 600                
Duration of contract                 20 years                
Cove Point                                  
Schedule of Equity Method Investments [Line Items]                                  
Ownership interest percentage of general partners       100.00%   25.00% 25.00%                    
Cove Point | GT&S Transaction                                  
Schedule of Equity Method Investments [Line Items]                                  
Ownership percentage   50.00%   50.00%                          
JAX LNG LLC | Pivotal LNG                                  
Schedule of Equity Method Investments [Line Items]                                  
Percentage of equity interest sold to noncontrolling interest owners                                 50.00%
Blue Racer                                  
Schedule of Equity Method Investments [Line Items]                                  
Ownership interest percentage of general partners                           50.00%      
Additional consideration including interest received in connection with sale                   $ 151,000,000              
Up-front cash consideration                           $ 1,050,000,000.00      
Additional deferred consideration, subject to increase for interest cost effective payable upon purchaser's availability of cash                           150,000,000      
Fowler Ridge                                  
Schedule of Equity Method Investments [Line Items]                                  
Net payment of long-term power and capacity contract         $ 150,000,000                        
Contract termination loss                       221,000,000          
Contract termination loss net of tax                       $ 165,000,000          
Fowler Ridge | BP Wind Energy North America Inc                                  
Schedule of Equity Method Investments [Line Items]                                  
Percentage of equity interest sold to noncontrolling interest owners         50.00%                        
Wrangler Retail Gas Holdings LLC                                  
Schedule of Equity Method Investments [Line Items]                                  
Ownership interest percentage of general partners                     20.00% 20.00% 20.00%        
Percentage ownership in total units     15.00%               15.00%            
Limited partnership interest sale transaction, proceeds received                     $ 127,000,000 $ 74,000,000 $ 301,000,000        
Initial fair value     $ 23,000,000     $ 75,000,000         23,000,000 13,000,000 75,000,000        
Amount of gain from sale                     87,000,000 64,000,000 147,000,000        
Goodwill write-off                     14,000,000   73,000,000        
Income tax expense                     $ 32,000,000 19,000,000 82,000,000        
Wrangler Retail Gas Holdings LLC | Gas Supply, Inc.                                  
Schedule of Equity Method Investments [Line Items]                                  
Ownership interest percentage of general partners                     5.00%            
Amount of gain from sale                     $ 10,000,000            
Income tax expense                     3,000,000            
Sale of interest in Cove Point                     33,000,000            
Dominion Energy Virginia | Subsequent Event                                  
Schedule of Equity Method Investments [Line Items]                                  
Percentage ownership in total units 50.00%                                
Agreement entered date 2022-02                                
Total cash proceeds expected $ 168,000,000                                
Expects to recognize gains totaling 150,000,000                                
Expects to recognize gains totaling, after tax $ 110,000,000                                
Cove Point                                  
Schedule of Equity Method Investments [Line Items]                                  
Distributions received from investment                     $ 300,000,000 70,000,000          
Ownership percentage     50.00%               50.00%            
Contributions to equity method affiliates                     $ 0 0          
Cove Point | Finite Lived Equity Method Investment Basis Difference                                  
Schedule of Equity Method Investments [Line Items]                                  
Equity method investment goodwill     $ 221,000,000               221,000,000 227,000,000          
Cove Point | Cove Point                                  
Schedule of Equity Method Investments [Line Items]                                  
Earnings from equity method investees                       40,000,000          
Distributions received from investment                           $ 50,000,000      
Percentage of limited partner interest sold           25.00%                      
Income loss from continuing operations before income taxes extraordinary items noncontrolling interest                     528,000,000 511,000,000 $ 471,000,000        
Cove Point | Cove Point | GT&S Transaction                                  
Schedule of Equity Method Investments [Line Items]                                  
Percentage of limited partner interest sold       25.00%                          
Ownership percentage   50.00%   50.00%                          
Pivotal LNG | Dominion Energy Gas Holdings, LLC                                  
Schedule of Equity Method Investments [Line Items]                                  
Ownership percentage acquired                                 100.00%
Trading Securities                                  
Schedule of Equity Method Investments [Line Items]                                  
Rabbi trust securities     $ 122,000,000               $ 122,000,000 $ 134,000,000          
[1] Includes income tax expense (benefit) of $188 million, $(204) million and $142 million for the years ended December 31, 2021, 2020 and 2019, respectively
[2] See Note 9 for amounts attributable to related parties
[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.
[4] Excludes Dominion Energy’s guarantees for the new corporate office property and an offshore wind installation vessel discussed in Note 15.