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v3.19.3.a.u2

Derivatives and Hedge Accounting Activities (Volume of Derivative Activity) (Detail) | 12 Months Ended
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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.

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