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Derivatives and Hedge Accounting Activities (Volume of Derivative Activity) (Detail) - 3 months ended Mar. 31, 2018 | USD ($) MWh Bcf gal | EUR (€)
--- | --- | ---
Fixed Price - Natural Gas - Current Derivative Contract |  |  |
Derivative [Line Items] |  |  |
Volume of derivative activity | Bcf | [1] | 70 |
Fixed Price - Natural Gas - Current Derivative Contract | Virginia Electric and Power Company |  |  |
Derivative [Line Items] |  |  |
Volume of derivative activity | Bcf | [1] | 21 |
Fixed Price - Natural Gas - Non-current Derivative Contract |  |  |
Derivative [Line Items] |  |  |
Volume of derivative activity | Bcf | [1] | 24 |
Fixed Price - Natural Gas - Non-current Derivative Contract | Virginia Electric and Power Company |  |  |
Derivative [Line Items] |  |  |
Volume of derivative activity | Bcf | [1] | 4 |
Basis - Natural Gas - Current Derivative Contract |  |  |
Derivative [Line Items] |  |  |
Volume of derivative activity | Bcf |  | 233 |
Basis - Natural Gas - Current Derivative Contract | Virginia Electric and Power Company |  |  |
Derivative [Line Items] |  |  |
Volume of derivative activity | Bcf |  | 132 |
Basis - Natural Gas - Non-current Derivative Contract |  |  |
Derivative [Line Items] |  |  |
Volume of derivative activity | Bcf |  | 600 |
Basis - Natural Gas - Non-current Derivative Contract | Virginia Electric and Power Company |  |  |
Derivative [Line Items] |  |  |
Volume of derivative activity | Bcf |  | 532 |
Fixed Price - Electricity - Current Derivative Contract |  |  |
Derivative [Line Items] |  |  |
Volume of electricity | MWh | [1] | 9,637,759 |
Fixed Price - Electricity - Current Derivative Contract | Virginia Electric and Power Company |  |  |
Derivative [Line Items] |  |  |
Volume of electricity | MWh | [1] | 1,445,264 |
Fixed Price - Electricity - Non-current Derivative Contract |  |  |
Derivative [Line Items] |  |  |
Volume of electricity | MWh | [1] | 919,920 |
Financial Transmission Rights - Electricity- Current Derivative Contract |  |  |
Derivative [Line Items] |  |  |
Volume of electricity | MWh |  | 19,630,088 |
Financial Transmission Rights - Electricity- Current Derivative Contract | Virginia Electric and Power Company |  |  |
Derivative [Line Items] |  |  |
Volume of electricity | MWh |  | 17,179,279 |
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 - Current Derivative Contract |  |  |
Derivative [Line Items] |  |  |
Volume of derivative activity | gal | [2] | 60,630,000 |
Liquids - Current Derivative Contract | Dominion Energy Gas Holdings, LLC |  |  |
Derivative [Line Items] |  |  |
Volume of derivative activity | gal |  | 55,254,000 |
Liquids - Non-current Derivative Contract |  |  |
Derivative [Line Items] |  |  |
Volume of derivative activity | gal | [2] | 0 |
Liquids - Non-current Derivative Contract | Dominion Energy Gas Holdings, LLC |  |  |
Derivative [Line Items] |  |  |
Volume of derivative activity | gal |  | 0 |
Foreign currency | Dominion Energy Gas Holdings, LLC |  |  |
Derivative [Line Items] |  |  |
Interest rate / Foreign currency (US Dollars, Euros) | € |  |  | € 250,000,000
Foreign Exchange - Current Derivative Contract |  |  |
Derivative [Line Items] |  |  |
Interest rate / Foreign currency (US Dollars, Euros) | $ | [3],[4] | $ 0 |
Foreign Exchange - Current Derivative Contract | Dominion Energy Gas Holdings, LLC |  |  |
Derivative [Line Items] |  |  |
Interest rate / Foreign currency (US Dollars, Euros) | $ | [5] | 0 |
Foreign Exchange - Non- Current Derivative Contract |  |  |
Derivative [Line Items] |  |  |
Interest rate / Foreign currency (US Dollars, Euros) | $ | [3],[4] | 280,000,000 |
Foreign Exchange - Non- Current Derivative Contract | Dominion Energy Gas Holdings, LLC |  |  |
Derivative [Line Items] |  |  |
Interest rate / Foreign currency (US Dollars, Euros) | $ | [5] | 280,000,000 |
Interest Rate - Current Derivative Contract |  |  |
Derivative [Line Items] |  |  |
Interest rate / Foreign currency (US Dollars, Euros) | $ | [4] | 1,400,000,000 |
Interest Rate - Current Derivative Contract | Virginia Electric and Power Company |  |  |
Derivative [Line Items] |  |  |
Interest rate / Foreign currency (US Dollars, Euros) | $ | [6] | 600,000,000 |
Interest Rate - Non-current Derivative Contract |  |  |
Derivative [Line Items] |  |  |
Interest rate / Foreign currency (US Dollars, Euros) | $ | [4] | 4,790,445,562 |
Interest Rate - Non-current Derivative Contract | Virginia Electric and Power Company |  |  |
Derivative [Line Items] |  |  |
Interest rate / Foreign currency (US Dollars, Euros) | $ | [6] | $ 900,000,000 |
[1] | Includes options.
[2] | Includes NGLs and oil.
[3] | Euro equivalent volumes are €250,000,000.
[4] | Maturity is determined based on final settlement period.
[5] | Maturity is determined based on final settlement period. Euro equivalent volumes are €250,000,000
[6] | Maturity is determined based on final settlement period.

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