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v3.19.3

Derivatives and Hedge Accounting Activities (Volume of Derivative Activity) (Detail) | 6 Months Ended
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Jun. 30, 2019 USD ($) MWh Bcf gal
Fixed Price - Natural Gas - Current Derivative Contract |  |
Derivative [Line Items] |  |
Volume of derivative activity | Bcf | 111 | [1]
Fixed Price - Natural Gas - Current Derivative Contract | Virginia Electric and Power Company |  |
Derivative [Line Items] |  |
Volume of derivative activity | Bcf | 39 | [1]
Basis - Natural Gas - Current Derivative Contract |  |
Derivative [Line Items] |  |
Volume of derivative activity | Bcf | 248 |
Basis - Natural Gas - Current Derivative Contract | Virginia Electric and Power Company |  |
Derivative [Line Items] |  |
Volume of derivative activity | Bcf | 141 |
Basis - Natural Gas - Current Derivative Contract | Dominion Energy Gas Holdings, LLC |  |
Derivative [Line Items] |  |
Volume of derivative activity | Bcf | 1 |
Fixed Price - Electricity - Current Derivative Contract |  |
Derivative [Line Items] |  |
Volume of electricity | MWh | 5,881,750 |
Financial Transmission Rights - Electricity- Current Derivative Contract |  |
Derivative [Line Items] |  |
Volume of electricity | MWh | 104,772,623 |
Financial Transmission Rights - Electricity- Current Derivative Contract | Virginia Electric and Power Company |  |
Derivative [Line Items] |  |
Volume of electricity | MWh | 104,772,623 |
NGLs - Current Derivative Contract |  |
Derivative [Line Items] |  |
Volume of derivative activity | gal | 18,648,000 |
NGLs - Current Derivative Contract | Dominion Energy Gas Holdings, LLC |  |
Derivative [Line Items] |  |
Volume of derivative activity | gal | 18,648,000 |
Interest Rate - Current Derivative Contract |  |
Derivative [Line Items] |  |
Interest rate / Foreign currency (US Dollars, Euros) | $ | $ 1,150,000,000 | [2]
Interest Rate - Current Derivative Contract | Virginia Electric and Power Company |  |
Derivative [Line Items] |  |
Interest rate / Foreign currency (US Dollars, Euros) | $ | 850,000,000 | [2]
Interest Rate - Current Derivative Contract | Dominion Energy Gas Holdings, LLC |  |
Derivative [Line Items] |  |
Interest rate / Foreign currency (US Dollars, Euros) | $ | 300,000,000 | [2]
Foreign Exchange - Current Derivative Contract |  |
Derivative [Line Items] |  |
Interest rate / Foreign currency (US Dollars, Euros) | $ | 0 | [2],[3]
Foreign Exchange - Current Derivative Contract | Dominion Energy Gas Holdings, LLC |  |
Derivative [Line Items] |  |
Interest rate / Foreign currency (US Dollars, Euros) | $ | $ 0 | [2],[3]
Fixed Price - Natural Gas - Non-current Derivative Contract |  |
Derivative [Line Items] |  |
Volume of derivative activity | Bcf | 67 | [1]
Fixed Price - Natural Gas - Non-current Derivative Contract | Virginia Electric and Power Company |  |
Derivative [Line Items] |  |
Volume of derivative activity | Bcf | 22 | [1]
Basis - Natural Gas - Non-current Derivative Contract |  |
Derivative [Line Items] |  |
Volume of derivative activity | Bcf | 525 |
Basis - Natural Gas - Non-current Derivative Contract | Virginia Electric and Power Company |  |
Derivative [Line Items] |  |
Volume of derivative activity | Bcf | 455 |
Basis - Natural Gas - Non-current Derivative Contract | Dominion Energy Gas Holdings, LLC |  |
Derivative [Line Items] |  |
Volume of derivative activity | Bcf | 0 |
Fixed Price - Electricity - Non-current Derivative Contract |  |
Derivative [Line Items] |  |
Volume of electricity | MWh | 771,800 |
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) | $ | $ 5,394,066,073 | [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 | [2]
Foreign Exchange - Non- Current Derivative Contract |  |
Derivative [Line Items] |  |
Interest rate / Foreign currency (US Dollars, Euros) | $ | 280,000,000 | [2],[3]
Foreign Exchange - Non- Current Derivative Contract | Dominion Energy Gas Holdings, LLC |  |
Derivative [Line Items] |  |
Interest rate / Foreign currency (US Dollars, Euros) | $ | $ 280,000,000 | [2],[3]
[1] | Includes options.
[2] | Maturity is determined based on final settlement period.
[3] | Euro equivalent volumes are €250,000,000.

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