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Derivatives and Hedge Accounting Activities (Volume of Derivative Activity) (Detail) - 3 months ended Mar. 31, 2020 | USD ($) MWh Bcf gal | EUR (€)
--- | --- | ---
Fixed Price - Natural Gas - Current Derivative Contract |  |  |
Derivative [Line Items] |  |  |
Volume of derivative activity | [1] | 81 |
Fixed Price - Natural Gas - Current Derivative Contract | Virginia Electric and Power Company |  |  |
Derivative [Line Items] |  |  |
Volume of derivative activity | [1] | 37 |
Basis - Natural Gas - Current Derivative Contract |  |  |
Derivative [Line Items] |  |  |
Volume of derivative activity |  | 268 |
Basis - Natural Gas - Current Derivative Contract | Virginia Electric and Power Company |  |  |
Derivative [Line Items] |  |  |
Volume of derivative activity |  | 160 |
Fixed Price - Electricity - Current Derivative Contract |  |  |
Derivative [Line Items] |  |  |
Volume of electricity | MWh |  | 3,088,875 |
Fixed Price - Electricity - Current Derivative Contract | Virginia Electric and Power Company |  |  |
Derivative [Line Items] |  |  |
Volume of electricity | MWh |  | 18,836,472 |
Financial Transmission Rights - Electricity- Current Derivative Contract |  |  |
Derivative [Line Items] |  |  |
Volume of electricity | MWh |  | 18,836,472 |
Liquids - Current Derivative Contract |  |  |
Derivative [Line Items] |  |  |
Volume of derivative activity | gal | [2] | 39,690,000 |
Interest Rate - Current Derivative Contract |  |  |
Derivative [Line Items] |  |  |
Interest rate / Foreign currency (US Dollars, Euros) | $ | [3] | $ 2,450,000,000 |
Interest Rate - Current Derivative Contract | Virginia Electric and Power Company |  |  |
Derivative [Line Items] |  |  |
Interest rate / Foreign currency (US Dollars, Euros) | $ | [3] | 900,000,000 |
Interest Rate - Current Derivative Contract | Dominion Energy Gas Holdings, LLC |  |  |
Derivative [Line Items] |  |  |
Interest rate / Foreign currency (US Dollars, Euros) | $ | [3] | $ 250,000,000 |
Foreign Exchange - Current Derivative Contract |  |  |
Derivative [Line Items] |  |  |
Interest rate / Foreign currency (US Dollars, Euros) | € | [3] |  | € 0
Foreign Exchange - Current Derivative Contract | Dominion Energy Gas Holdings, LLC |  |  |
Derivative [Line Items] |  |  |
Interest rate / Foreign currency (US Dollars, Euros) | € | [3] |  | 0
Fixed Price - Natural Gas - Non-current Derivative Contract |  |  |
Derivative [Line Items] |  |  |
Volume of derivative activity | [1] | 36 |
Fixed Price - Natural Gas - Non-current Derivative Contract | Virginia Electric and Power Company |  |  |
Derivative [Line Items] |  |  |
Volume of derivative activity | [1] | 14 |
Basis - Natural Gas - Non-current Derivative Contract |  |  |
Derivative [Line Items] |  |  |
Volume of derivative activity |  | 574 |
Basis - Natural Gas - Non-current Derivative Contract | Virginia Electric and Power Company |  |  |
Derivative [Line Items] |  |  |
Volume of derivative activity |  | 536 |
Fixed Price - Electricity - Non-current Derivative Contract |  |  |
Derivative [Line Items] |  |  |
Volume of electricity | MWh |  | 0 |
Financial Transmission Rights - Electricity- Non-current Derivative Contract |  |  |
Derivative [Line Items] |  |  |
Volume of electricity | MWh |  | 0 |
Financial Transmission Rights - Electricity- Non-current Derivative Contract | Virginia Electric and Power Company |  |  |
Derivative [Line Items] |  |  |
Volume of electricity | MWh |  | 0 |
Liquids - Non-current Derivative Contract |  |  |
Derivative [Line Items] |  |  |
Volume of derivative activity | gal | [2] | 0 |
Interest Rate - Non-current Derivative Contract |  |  |
Derivative [Line Items] |  |  |
Interest rate / Foreign currency (US Dollars, Euros) | $ | [3] | $ 5,582,850,761 |
Interest Rate - Non-current Derivative Contract | Virginia Electric and Power Company |  |  |
Derivative [Line Items] |  |  |
Interest rate / Foreign currency (US Dollars, Euros) | $ |  | 1,150,000,000 |
Interest Rate - Non-current Derivative Contract | Dominion Energy Gas Holdings, LLC |  |  |
Derivative [Line Items] |  |  |
Interest rate / Foreign currency (US Dollars, Euros) | $ | [3] | $ 1,050,000,000 |
Foreign Exchange - Non- Current Derivative Contract |  |  |
Derivative [Line Items] |  |  |
Interest rate / Foreign currency (US Dollars, Euros) | € | [3] |  | 250,000,000
Foreign Exchange - Non- Current Derivative Contract | Dominion Energy Gas Holdings, LLC |  |  |
Derivative [Line Items] |  |  |
Interest rate / Foreign currency (US Dollars, Euros) | € | [3] |  | € 250,000,000
[1] | Includes options.
[2] | Includes NGLs.
[3] | Maturity is determined based on final settlement period.

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