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Derivatives and Hedge Accounting Activities (Volume of Derivative Activity) (Detail)
 12 Months Ended
Dec. 31, 2019
USD ($)
MWh
gal
Bcf
Fixed Price - Natural Gas - Non-current Derivative Contract  
Derivative [Line Items]  
Volume of derivative activity | Bcf 34 [1]
Fixed Price - Natural Gas - Non-current Derivative Contract | Virginia Electric and Power Company  
Derivative [Line Items]  
Volume of derivative activity | Bcf 9 [1]
Basis - Natural Gas - Non-current Derivative Contract  
Derivative [Line Items]  
Volume of derivative activity | Bcf 495 [1]
Basis - Natural Gas - Non-current Derivative Contract | Virginia Electric and Power Company  
Derivative [Line Items]  
Volume of derivative activity | Bcf 448
Fixed Price - Electricity - Non-current Derivative Contract  
Derivative [Line Items]  
Volume of electricity | MWh 0 [1]
Financial Transmission Rights - Electricity- Non-current Derivative Contract  
Derivative [Line Items]  
Volume of electricity | MWh 0 [1]
Liquids - Non-current Derivative Contract  
Derivative [Line Items]  
Volume of derivative activity | gal 0 [2]
Interest Rate - Non-current Derivative Contract  
Derivative [Line Items]  
Interest rate / Foreign currency (US Dollars, Euros) $ 3,976,014,497 [3]
Interest Rate - Non-current Derivative Contract | Virginia Electric and Power Company  
Derivative [Line Items]  
Interest rate / Foreign currency (US Dollars, Euros) 950,000,000 [3]
Interest Rate - Non-current Derivative Contract | Dominion Energy Gas Holdings, LLC  
Derivative [Line Items]  
Interest rate / Foreign currency (US Dollars, Euros) 1,050,000,000 [3]
Foreign Exchange - Non- Current Derivative Contract  
Derivative [Line Items]  
Interest rate / Foreign currency (US Dollars, Euros) 250,000,000 [3],[4]
Foreign Exchange - Non- Current Derivative Contract | Dominion Energy Gas Holdings, LLC  
Derivative [Line Items]  
Interest rate / Foreign currency (US Dollars, Euros) $ 250,000,000 [3],[5]
Fixed Price - Natural Gas - Current Derivative Contract  
Derivative [Line Items]  
Volume of derivative activity | Bcf 79 [1]
Fixed Price - Natural Gas - Current Derivative Contract | Virginia Electric and Power Company  
Derivative [Line Items]  
Volume of derivative activity | Bcf 41 [1]
Basis - Natural Gas - Current Derivative Contract  
Derivative [Line Items]  
Volume of derivative activity | Bcf 227 [1]
Basis - Natural Gas - Current Derivative Contract | Virginia Electric and Power Company  
Derivative [Line Items]  
Volume of derivative activity | Bcf 132
Fixed Price - Electricity - Current Derivative Contract  
Derivative [Line Items]  
Volume of electricity | MWh 3,810,015 [1]
Financial Transmission Rights - Electricity- Current Derivative Contract  
Derivative [Line Items]  
Volume of electricity | MWh 46,585,304 [1]
Financial Transmission Rights - Electricity- Current Derivative Contract | Virginia Electric and Power Company  
Derivative [Line Items]  
Volume of electricity | MWh 46,585,304
Liquids - Current Derivative Contract  
Derivative [Line Items]  
Volume of derivative activity | gal 52,374,000 [2]
Interest Rate - Current Derivative Contract  
Derivative [Line Items]  
Interest rate / Foreign currency (US Dollars, Euros) $ 2,450,000,000 [3]
Interest Rate - Current Derivative Contract | Virginia Electric and Power Company  
Derivative [Line Items]  
Interest rate / Foreign currency (US Dollars, Euros) 900,000,000 [3]
Interest Rate - Current Derivative Contract | Dominion Energy Gas Holdings, LLC  
Derivative [Line Items]  
Interest rate / Foreign currency (US Dollars, Euros) 250,000,000 [3]
Foreign Exchange - Current Derivative Contract  
Derivative [Line Items]  
Interest rate / Foreign currency (US Dollars, Euros) 0 [3],[4]
Foreign Exchange - Current Derivative Contract | Dominion Energy Gas Holdings, LLC  
Derivative [Line Items]  
Interest rate / Foreign currency (US Dollars, Euros) $ 0 [3],[5]
[1] Includes options.
[2] Includes NGLs.
[3] Maturity is determined based on final settlement period.
[4] Euro equivalent volumes are € 250,000,000.
[5] Euro equivalent volumes are €250,000,000.