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Derivatives and Hedge Accounting Activities (Volume of Derivative Activity) (Details) - 3 months ended Mar. 31, 2017 MMcf in Thousands, € in Millions | USD ($) MWh MMcf gal | EUR (€)
--- | --- | ---
Fixed Price - Natural Gas - Current Derivative Contract |  |  |
Derivative [Line Items] |  |  |
Volume of derivative activity (bcf, Gal) | [1] | 92 |
Fixed Price - Natural Gas - Non-current Derivative Contract |  |  |
Derivative [Line Items] |  |  |
Volume of derivative activity (bcf, Gal) | [1] | 11 |
Basis - Natural Gas - Current Derivative Contract |  |  |
Derivative [Line Items] |  |  |
Volume of derivative activity (bcf, Gal) |  | 194 |
Basis - Natural Gas - Non-current Derivative Contract |  |  |
Derivative [Line Items] |  |  |
Volume of derivative activity (bcf, Gal) |  | 607 |
Fixed Price - Electricity - Current Derivative Contract |  |  |
Derivative [Line Items] |  |  |
Volume of electricity (MWh) | MWh |  | 13,457,158 |
Fixed Price - Electricity - Non-current Derivative Contract |  |  |
Derivative [Line Items] |  |  |
Volume of electricity (MWh) | MWh |  | 1,537,046 |
Financial Transmission Rights - Electricity- Current Derivative Contract |  |  |
Derivative [Line Items] |  |  |
Volume of electricity (MWh) | MWh |  | 19,361,385 |
Financial Transmission Rights - Electricity- Non-current Derivative Contract |  |  |
Derivative [Line Items] |  |  |
Volume of electricity (MWh) | MWh |  | 0 |
Liquids - Current Derivative Contract |  |  |
Derivative [Line Items] |  |  |
Volume of derivative activity (bcf, Gal) | gal | [2] | 60,968,672 |
Liquids - Non-current Derivative Contract |  |  |
Derivative [Line Items] |  |  |
Volume of derivative activity (bcf, Gal) | gal | [2] | 0 |
Foreign currency |  |  |
Derivative [Line Items] |  |  |
Interest rate (US Dollars, Euros) | € |  |  | € 250
Foreign Exchange - Current Derivative Contract |  |  |
Derivative [Line Items] |  |  |
Interest rate (US Dollars, Euros) | $ | [3],[4] | $ 0 |
Foreign Exchange - Non- Current Derivative Contract |  |  |
Derivative [Line Items] |  |  |
Interest rate (US Dollars, Euros) | $ | [3],[4] | 280,000,000 |
Interest Rate - Current Derivative Contract |  |  |
Derivative [Line Items] |  |  |
Interest rate (US Dollars, Euros) | $ | [4] | 2,050,000,000 |
Interest Rate - Non-current Derivative Contract |  |  |
Derivative [Line Items] |  |  |
Interest rate (US Dollars, Euros) | $ | [4] | $ 4,953,640,679 |
Virginia Electric and Power Company | Fixed Price - Natural Gas - Current Derivative Contract |  |  |
Derivative [Line Items] |  |  |
Volume of derivative activity (bcf, Gal) | [5] | 37 |
Virginia Electric and Power Company | Fixed Price - Natural Gas - Non-current Derivative Contract |  |  |
Derivative [Line Items] |  |  |
Volume of derivative activity (bcf, Gal) | [5] | 8 |
Virginia Electric and Power Company | Basis - Natural Gas - Current Derivative Contract |  |  |
Derivative [Line Items] |  |  |
Volume of derivative activity (bcf, Gal) |  | 74 |
Virginia Electric and Power Company | Basis - Natural Gas - Non-current Derivative Contract |  |  |
Derivative [Line Items] |  |  |
Volume of derivative activity (bcf, Gal) |  | 565 |
Virginia Electric and Power Company | Fixed Price - Electricity - Current Derivative Contract |  |  |
Derivative [Line Items] |  |  |
Volume of electricity (MWh) | MWh | [5] | 1,580,034 |
Virginia Electric and Power Company | Fixed Price - Electricity - Non-current Derivative Contract |  |  |
Derivative [Line Items] |  |  |
Volume of electricity (MWh) | MWh | [5] | 1,537,046 |
Virginia Electric and Power Company | Financial Transmission Rights - Electricity- Current Derivative Contract |  |  |
Derivative [Line Items] |  |  |
Volume of electricity (MWh) | MWh |  | 17,668,870 |
Virginia Electric and Power Company | Financial Transmission Rights - Electricity- Non-current Derivative Contract |  |  |
Derivative [Line Items] |  |  |
Volume of electricity (MWh) | MWh |  | 0 |
Virginia Electric and Power Company | Interest Rate - Current Derivative Contract |  |  |
Derivative [Line Items] |  |  |
Interest rate (US Dollars, Euros) | $ | [6] | $ 1,050,000,000 |
Virginia Electric and Power Company | Interest Rate - Non-current Derivative Contract |  |  |
Derivative [Line Items] |  |  |
Interest rate (US Dollars, Euros) | $ | [6] | $ 1,150,000,000 |
Dominion Gas Holdings, LLC | Fixed Price - Natural Gas - Current Derivative Contract |  |  |
Derivative [Line Items] |  |  |
Volume of derivative activity (bcf, Gal) |  | 3 |
Dominion Gas Holdings, LLC | Fixed Price - Natural Gas - Non-current Derivative Contract |  |  |
Derivative [Line Items] |  |  |
Volume of derivative activity (bcf, Gal) |  | 0 |
Dominion Gas Holdings, LLC | Basis - Natural Gas - Current Derivative Contract |  |  |
Derivative [Line Items] |  |  |
Volume of derivative activity (bcf, Gal) |  | 6 |
Dominion Gas Holdings, LLC | Basis - Natural Gas - Non-current Derivative Contract |  |  |
Derivative [Line Items] |  |  |
Volume of derivative activity (bcf, Gal) |  | 0 |
Dominion Gas Holdings, LLC | Liquids - Current Derivative Contract |  |  |
Derivative [Line Items] |  |  |
Volume of derivative activity (bcf, Gal) | gal |  | 51,224,672 |
Dominion Gas Holdings, LLC | Liquids - Non-current Derivative Contract |  |  |
Derivative [Line Items] |  |  |
Volume of derivative activity (bcf, Gal) | gal |  | 0 |
Dominion Gas Holdings, LLC | Foreign currency |  |  |
Derivative [Line Items] |  |  |
Interest rate (US Dollars, Euros) | € |  |  | € 250
Dominion Gas Holdings, LLC | Foreign Exchange - Current Derivative Contract |  |  |
Derivative [Line Items] |  |  |
Interest rate (US Dollars, Euros) | $ | [7] | $ 0 |
Dominion Gas Holdings, LLC | Foreign Exchange - Non- Current Derivative Contract |  |  |
Derivative [Line Items] |  |  |
Interest rate (US Dollars, Euros) | $ | [7] | $ 280,000,000 |
[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] | Includes options.
[6] | Maturity is determined based on final settlement period.
[7] | Maturity is determined based on final settlement period. Euro equivalent volumes are €250,000,000.

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