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Investments (Narrative) (Detail)
$ in Millions
1 Months Ended 3 Months Ended 9 Months Ended 12 Months Ended
Sep. 30, 2018
USD ($)
Sep. 30, 2014
member
mi
Dec. 31, 2019
USD ($)
Sep. 30, 2019
USD ($)
Mar. 31, 2019
USD ($)
Sep. 30, 2018
USD ($)
Sep. 30, 2019
USD ($)
Sep. 30, 2018
USD ($)
Dec. 31, 2021
USD ($)
Dec. 31, 2018
USD ($)
Schedule of Equity Method Investments [Line Items]                    
Contributions to equity method affiliates             $ 187 $ 282    
Investment in equity method affiliates       $ 1,528     1,528     $ 1,278 [1]
Other receivables [2]       363     363     $ 331 [1]
Blue Racer                    
Schedule of Equity Method Investments [Line Items]                    
Additional consideration including interest received in connection with sale         $ 151          
Ownership interest percentage of limited partner interests                   50.00%
Catalyst Old River Hydroelectric Limited Partnership                    
Schedule of Equity Method Investments [Line Items]                    
Ownership interest percentage of limited partner interests 25.00%                  
Limited partnership interest sale transaction, proceeds received $ 91                  
Catalyst Old River Hydroelectric Limited Partnership | Other Income                    
Schedule of Equity Method Investments [Line Items]                    
Amount of gain from sale 87                  
Amount of after tax gain from sale $ 63                  
Scenario Forecast | Wrangler Retail Gas Holdings, LLC                    
Schedule of Equity Method Investments [Line Items]                    
Ownership interest percentage of limited partner interests     20.00%              
Limited partnership interest sale transaction, proceeds received     $ 250              
Amount of gain from sale     135              
Amount of after tax gain from sale     75              
Write-off of goodwill     $ 70              
Dominion Energy Gas Holdings, LLC                    
Schedule of Equity Method Investments [Line Items]                    
Investment in equity method affiliates       313     313     $ 339 [3]
Other receivables       19 [4]     19 [4]     18 [3],[5]
Equity in earnings on investments       8   $ 10 30 41    
Dominion Energy Gas Holdings, LLC | Partnership Interest                    
Schedule of Equity Method Investments [Line Items]                    
Investment in equity method affiliates       313     313     339
Equity in earnings on investments             30 41    
Investment in equity method contributions made             4      
Distributions received from investment             60 47    
Carrying amount of investment that exceeded share of underlying equity       146     146      
Atlantic Coast Pipeline                    
Schedule of Equity Method Investments [Line Items]                    
Contributions to equity method affiliates       47   147 175 306    
Atlantic Coast Pipeline | Minimum | Scenario Forecast                    
Schedule of Equity Method Investments [Line Items]                    
Project cost estimates                 $ 7,300  
Atlantic Coast Pipeline | Maximum [Member] | Scenario Forecast                    
Schedule of Equity Method Investments [Line Items]                    
Project cost estimates                 $ 7,800  
Atlantic Coast Pipeline | DETI                    
Schedule of Equity Method Investments [Line Items]                    
Revenue       24   $ 50 81 $ 156    
Other receivables       9     9     13
Atlantic Coast Pipeline | Current Liabilities                    
Schedule of Equity Method Investments [Line Items]                    
Investment in equity method affiliates       $ 10     $ 10      
Atlantic Coast Pipeline | Pipelines | Jointly Owned Natural Gas Pipeline | Distribution                    
Schedule of Equity Method Investments [Line Items]                    
Ownership interest (percentage)       48.00%     48.00%      
Length of natural gas pipeline (in miles) | mi   600                
Number of members | member   3                
Duration of contract   20 years                
Atlantic Coast Pipeline | Pipelines | Jointly Owned Natural Gas Pipeline | Distribution | Duke Energy                    
Schedule of Equity Method Investments [Line Items]                    
Ownership interest (percentage)       47.00%     47.00%      
Atlantic Coast Pipeline | Pipelines | Jointly Owned Natural Gas Pipeline | Distribution | Southern Company Gas [Member]                    
Schedule of Equity Method Investments [Line Items]                    
Ownership interest (percentage)       5.00%     5.00%      
Trading Securities                    
Schedule of Equity Method Investments [Line Items]                    
Rabbi trust securities       $ 114     $ 114     $ 111
[1] Dominion Energy’s Consolidated Balance Sheet at December 31, 2018 has been derived from the audited Consolidated Balance Sheet at that date.
[2] See Note 10 for amounts attributable to related parties.
[3] Dominion Energy Gas’ Consolidated Balance Sheet at December 31, 2018 has been derived from the audited Consolidated Balance Sheet at that date.
[4] See Note 20 for amounts attributable to affiliates.
[5] See Note 20 for amounts attributable to related parties.