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Derivatives and Hedge Accounting Activities (Volume of Derivative Activity) (Detail) | 12 Months Ended
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Dec. 31, 2018 USD ($) MWh Bcf gal
Fixed Price - Natural Gas - Current Derivative Contract |  |
Derivative [Line Items] |  |
Volume of derivative activity | Bcf | 56 | [1]
Fixed Price - Natural Gas - Current Derivative Contract | Virginia Electric and Power Company |  |
Derivative [Line Items] |  |
Volume of derivative activity | Bcf | 29 | [1]
Basis - Natural Gas - Current Derivative Contract |  |
Derivative [Line Items] |  |
Volume of derivative activity | Bcf | 214 |
Basis - Natural Gas - Current Derivative Contract | Virginia Electric and Power Company |  |
Derivative [Line Items] |  |
Volume of derivative activity | Bcf | 136 |
Fixed Price - Electricity - Current Derivative Contract |  |
Derivative [Line Items] |  |
Volume of electricity | MWh | 11,101,869 | [1]
Fixed Price - Electricity - Current Derivative Contract | Virginia Electric and Power Company |  |
Derivative [Line Items] |  |
Volume of electricity | MWh | 367,019 | [1]
Financial Transmission Rights - Electricity- Current Derivative Contract |  |
Derivative [Line Items] |  |
Volume of electricity | MWh | 45,351,415 |
Financial Transmission Rights - Electricity- Current Derivative Contract | Virginia Electric and Power Company |  |
Derivative [Line Items] |  |
Volume of electricity | MWh | 45,351,415 |
Liquids - Current Derivative Contract |  |
Derivative [Line Items] |  |
Volume of derivative activity | gal | 14,413,200 | [2]
Interest Rate - Current Derivative Contract |  |
Derivative [Line Items] |  |
Interest rate / Foreign currency (US Dollars, Euros) | $ | $ 2,700,000,000 | [3]
Interest Rate - Current Derivative Contract | Virginia Electric and Power Company |  |
Derivative [Line Items] |  |
Interest rate / Foreign currency (US Dollars, Euros) | $ | 700,000,000 | [3]
Interest Rate - Current Derivative Contract | Dominion Energy Gas Holdings, LLC |  |
Derivative [Line Items] |  |
Interest rate / Foreign currency (US Dollars, Euros) | $ | $ 600,000,000 | [3]
Fixed Price - Natural Gas - Non-current Derivative Contract |  |
Derivative [Line Items] |  |
Volume of derivative activity | Bcf | 27 | [1]
Fixed Price - Natural Gas - Non-current Derivative Contract | Virginia Electric and Power Company |  |
Derivative [Line Items] |  |
Volume of derivative activity | Bcf | 8 | [1]
Basis - Natural Gas - Non-current Derivative Contract |  |
Derivative [Line Items] |  |
Volume of derivative activity | Bcf | 557 |
Basis - Natural Gas - Non-current Derivative Contract | Virginia Electric and Power Company |  |
Derivative [Line Items] |  |
Volume of derivative activity | Bcf | 488 |
Fixed Price - Electricity - Non-current Derivative Contract |  |
Derivative [Line Items] |  |
Volume of electricity | MWh | 1,537,200 | [1]
Interest Rate - Non-current Derivative Contract |  |
Derivative [Line Items] |  |
Interest rate / Foreign currency (US Dollars, Euros) | $ | $ 3,915,839,913 | [3]
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 | [3]
Interest Rate - Non-current Derivative Contract | Dominion Energy Gas Holdings, LLC |  |
Derivative [Line Items] |  |
Interest rate / Foreign currency (US Dollars, Euros) | $ | 750,000,000 | [3]
Foreign Exchange - Non- Current Derivative Contract |  |
Derivative [Line Items] |  |
Interest rate / Foreign currency (US Dollars, Euros) | $ | 280,000,000 | [3],[4]
Foreign Exchange - Non- Current Derivative Contract | Dominion Energy Gas Holdings, LLC |  |
Derivative [Line Items] |  |
Interest rate / Foreign currency (US Dollars, Euros) | $ | $ 280,000,000 | [3],[4]
NGLs - Current Derivative Contract | Dominion Energy Gas Holdings, LLC |  |
Derivative [Line Items] |  |
Volume of derivative activity | gal | 14,413,200 |
[1] | Includes options.
[2] | Includes NGLs and oil.
[3] | Maturity is determined based on final settlement period.
[4] | Euro equivalent volumes are € 250,000,000.

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