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Derivatives and Hedge Accounting Activities (Volume of Derivative Activity) (Detail) | 9 Months Ended
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Sep. 30, 2019 USD ($) MWh Bcf gal
Fixed Price - Natural Gas - Current Derivative Contract |  |
Derivative [Line Items] |  |
Volume of derivative activity | Bcf | 125 | [1]
Fixed Price - Natural Gas - Current Derivative Contract | Virginia Electric and Power Company |  |
Derivative [Line Items] |  |
Volume of derivative activity | Bcf | 44 | [1]
Basis - Natural Gas - Current Derivative Contract |  |
Derivative [Line Items] |  |
Volume of derivative activity | Bcf | 256 |
Basis - Natural Gas - Current Derivative Contract | Virginia Electric and Power Company |  |
Derivative [Line Items] |  |
Volume of derivative activity | Bcf | 151 |
Fixed Price - Electricity - Current Derivative Contract |  |
Derivative [Line Items] |  |
Volume of electricity | MWh | 3,262,550 |
Fixed Price - Electricity - Current Derivative Contract | Virginia Electric and Power Company |  |
Derivative [Line Items] |  |
Volume of electricity | MWh | 74,936,524 |
Financial Transmission Rights - Electricity- Current Derivative Contract |  |
Derivative [Line Items] |  |
Volume of electricity | MWh | 74,936,524 |
NGLs - Current Derivative Contract |  |
Derivative [Line Items] |  |
Volume of derivative activity | gal | 17,892,000 |
NGLs - Current Derivative Contract | Dominion Energy Gas Holdings, LLC |  |
Derivative [Line Items] |  |
Volume of derivative activity | gal | 17,892,000 |
Interest Rate - Current Derivative Contract |  |
Derivative [Line Items] |  |
Interest rate / Foreign currency (US Dollars, Euros) | $ 850,000,000 | [2]
Interest Rate - Current Derivative Contract | Virginia Electric and Power Company |  |
Derivative [Line Items] |  |
Interest rate / Foreign currency (US Dollars, Euros) | 550,000,000 | [2]
Interest Rate - Current Derivative Contract | Dominion Energy Gas Holdings, LLC |  |
Derivative [Line Items] |  |
Interest rate / Foreign currency (US Dollars, Euros) | 300,000,000 | [3]
Foreign Exchange - Current Derivative Contract |  |
Derivative [Line Items] |  |
Interest rate / Foreign currency (US Dollars, Euros) | 0 | [2],[4]
Foreign Exchange - Current Derivative Contract | Dominion Energy Gas Holdings, LLC |  |
Derivative [Line Items] |  |
Interest rate / Foreign currency (US Dollars, Euros) | $ 0 | [3],[4]
Fixed Price - Natural Gas - Non-current Derivative Contract |  |
Derivative [Line Items] |  |
Volume of derivative activity | Bcf | 63 | [1]
Fixed Price - Natural Gas - Non-current Derivative Contract | Virginia Electric and Power Company |  |
Derivative [Line Items] |  |
Volume of derivative activity | Bcf | 16 | [1]
Basis - Natural Gas - Non-current Derivative Contract |  |
Derivative [Line Items] |  |
Volume of derivative activity | Bcf | 541 |
Basis - Natural Gas - Non-current Derivative Contract | Virginia Electric and Power Company |  |
Derivative [Line Items] |  |
Volume of derivative activity | Bcf | 472 |
Fixed Price - Electricity - Non-current Derivative Contract |  |
Derivative [Line Items] |  |
Volume of electricity | MWh | 369,850 |
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 |
NGLs - Non-current Derivative Contract |  |
Derivative [Line Items] |  |
Volume of derivative activity | gal | 0 |
NGLs - Non-current Derivative Contract | Dominion Energy Gas Holdings, LLC |  |
Derivative [Line Items] |  |
Volume of derivative activity | gal | 0 |
Interest Rate - Non-current Derivative Contract |  |
Derivative [Line Items] |  |
Interest rate / Foreign currency (US Dollars, Euros) | $ 5,384,447,114 | [2]
Interest Rate - Non-current Derivative Contract | Virginia Electric and Power Company |  |
Derivative [Line Items] |  |
Interest rate / Foreign currency (US Dollars, Euros) | 1,200,000,000 | [2]
Interest Rate - Non-current Derivative Contract | Dominion Energy Gas Holdings, LLC |  |
Derivative [Line Items] |  |
Interest rate / Foreign currency (US Dollars, Euros) | 1,000,000,000 | [3]
Foreign Exchange - Non- Current Derivative Contract |  |
Derivative [Line Items] |  |
Interest rate / Foreign currency (US Dollars, Euros) | 280,000,000 | [2],[4]
Foreign Exchange - Non- Current Derivative Contract | Dominion Energy Gas Holdings, LLC |  |
Derivative [Line Items] |  |
Interest rate / Foreign currency (US Dollars, Euros) | $ 280,000,000 | [3],[4]
[1] | Includes options.
[2] | Maturity is determined based on final settlement period.
[3] | Maturity is determined based on final settlement period.
[4] | Euro equivalent volumes are €250,000,000.

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