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Property, Plant and Equipment (Narrative) (Detail) $ in Millions | 1 Months Ended | 3 Months Ended | 12 Months Ended |
--- | --- | --- | --- | ---
Jan. 31, 2018 USD ($) a | Dec. 31, 2017 USD ($) | Sep. 30, 2017 Project | Aug. 31, 2017 USD ($) a | Jul. 31, 2017 USD ($) a | Mar. 31, 2017 USD ($) | Apr. 30, 2016 USD ($) a | Sep. 30, 2015 USD ($) a Fields | Mar. 31, 2015 USD ($) a | Dec. 31, 2014 USD ($) | Nov. 30, 2014 USD ($) a Fields | Sep. 30, 2018 USD ($) | Dec. 31, 2017 USD ($) | Sep. 30, 2017 USD ($) | Dec. 31, 2019 USD ($) MW | Dec. 31, 2018 USD ($) | Dec. 31, 2017 USD ($) | Dec. 31, 2016 USD ($) a | Dec. 31, 2015 USD ($) | Dec. 31, 2013 USD ($) a | Oct. 31, 2017 USD ($)
Property, Plant and Equipment [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Project Cost |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 405 | $ 40 | $ 418 |  |
Retail Energy Marketing Assets | Disposal Group, Disposed of by Sale, Not Discontinued Operations |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Amount of consideration |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 143
Gain from sale |  | $ 78 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
After tax gain on sale |  | $ 48 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Contractual term of agreement to use brand |  | 10 years |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Retail Energy Marketing Assets | Disposal Group, Disposed of by Sale, Not Discontinued Operations | Scenario, Forecast |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Expected benefit to be recognized |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 65 |  |  |  |  |
Expected benefit to be recognized, net of tax |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 48 |  |  |  |  |
Retail Energy Marketing Assets | Disposal Group, Disposed of by Sale, Not Discontinued Operations | First Phase of Agreements to Sell Certain Assets |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Amount of consideration |  | $ 79 |  |  |  |  |  |  |  |  |  |  | $ 79 |  |  |  | 79 |  |  |  |
Dominion Energy Gas Holdings, LLC | Marcellus Shale [Member] | Oil and Gas Properties [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Amount of consideration |  |  |  |  | $ 5 |  |  |  |  |  | $ 120 |  |  |  |  |  |  | $ 10 |  | $ 200 |
Number of natural gas producers |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 2 |
Development rights (number of acres) | a |  |  |  |  | 2,000 |  |  |  | 11,000 |  | 24,000 |  |  |  |  |  |  | 4,000 |  | 100,000 |
Period for payments related to conveyance of natural gas storage fields |  |  |  |  |  |  |  |  |  |  | 4 years |  |  |  |  |  |  |  |  | 9 years |
Proceeds from assignment of Shale Development Rights |  |  |  |  |  |  |  |  | $ 27 | $ 16 | $ 60 |  |  |  |  |  |  |  |  | $ 100 |
Gas and oil area developed net remaining interest conveyed percentage |  |  |  |  | 50.00% |  |  |  |  |  | 50.00% |  |  |  |  |  |  | 50.00% |  |  |
Number of natural gas storage fields | Fields |  |  |  |  |  |  |  |  |  |  | 1 |  |  |  |  |  |  |  |  |  |
Number of acres included in initial conveyance | a |  |  |  |  |  |  |  |  |  |  | 12,000 |  |  |  |  |  |  |  |  |  |
Dominion Energy Gas Holdings, LLC | Marcellus Shale [Member] | Oil and Gas Properties [Member] | Other operations and maintenance |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Gain from sale |  |  |  |  | $ 5 |  |  |  | 27 |  |  |  |  |  |  |  |  | $ 10 |  |  |
After tax gain on sale |  |  |  |  | $ 3 |  |  |  | $ 16 |  |  |  |  |  |  |  |  | 6 |  |  |
Dominion Energy Gas Holdings, LLC | Marcellus Shale [Member] | Oil and Gas Properties [Member] | Amended Agreement to Extend Conveyance of Development Rights [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Development rights (number of acres) | a |  |  |  | 70,000 |  |  | 70,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Period for payments related to conveyance of natural gas storage fields |  |  |  |  |  |  |  |  | 2 years |  |  |  |  |  |  |  |  |  |  |  |
Development rights conveyed (number of acres) | a |  |  |  |  |  |  |  |  | 9,000 |  |  |  |  |  |  |  |  |  |  |  |
Partial interest percentage conveyed |  |  |  |  |  |  | 32.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |
Gas and oil area developed net remaining interest conveyed percentage |  |  |  | 68.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total consideration |  |  |  | $ 130 |  |  |  |  |  |  |  |  | 65 |  |  |  |  |  |  |  |
Gain from sale |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 56 |  |  |  |  |  |  |
After tax gain on sale |  |  |  |  |  |  |  |  |  |  |  |  |  | 33 |  |  |  |  |  |  |
Dominion Energy Gas Holdings, LLC | Marcellus Shale [Member] | Oil and Gas Properties [Member] | Amended Agreement to Extend Conveyance of Development Rights [Member] | Royalty Interest |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Gain from sale |  |  |  |  |  |  |  |  |  |  |  |  |  | 9 |  |  |  |  |  |  |
After tax gain on sale |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 5 |  |  |  |  |  |  |
Dominion Energy Gas Holdings, LLC | Marcellus Shale [Member] | Oil and Gas Properties [Member] | Amended Agreement to Extend Conveyance of Development Rights [Member] | Final Conveyance |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Gain from sale |  |  |  |  |  |  |  |  |  |  |  |  | 65 |  |  |  |  |  |  |  |
After tax gain on sale |  |  |  |  |  |  |  |  |  |  |  |  | $ 47 |  |  |  |  |  |  |  |
Dominion Energy Gas Holdings, LLC | Marcellus Shale [Member] | Oil and Gas Properties [Member] | Amended Agreement to Extend Conveyance of Development Rights [Member] | Scenario, Forecast |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total consideration |  |  |  |  |  |  |  |  |  |  |  | $ 65 |  |  |  |  |  |  |  |  |
Dominion Energy Gas Holdings, LLC | Marcellus Shale [Member] | Oil and Gas Properties [Member] | Amended Agreement to Extend Conveyance of Development Rights [Member] | Other operations and maintenance |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revenue recognized |  |  |  |  |  |  | $ 35 |  | $ 43 |  |  |  |  |  |  |  |  |  |  |  |
Revenue recognized net of tax |  |  |  |  |  |  | $ 21 |  | $ 27 |  |  |  |  |  |  |  |  |  |  |  |
Dominion Energy Gas Holdings, LLC | Marcellus Shale [Member] | Subsequent Event | Oil and Gas Properties [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Amount of consideration | $ 28 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Development rights (number of acres) | a | 18,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Gas and oil area developed net remaining interest conveyed percentage | 50.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Dominion Energy Gas Holdings, LLC | Marcellus Shale [Member] | Subsequent Event | Oil and Gas Properties [Member] | Other operations and maintenance |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Gain from sale | $ 28 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
After tax gain on sale | $ 20 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Dominion Energy Gas Holdings, LLC | Uticaand Point Pleasant Shale [Member] | Oil and Gas Properties [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Amount of consideration |  |  |  |  |  |  |  | $ 52 |  |  |  |  |  |  |  |  |  |  |  |  |
Development rights (number of acres) | a |  |  |  |  |  |  |  | 16,000 |  |  |  |  |  |  |  |  |  |  |  |  |
Proceeds from assignment of Shale Development Rights |  |  |  |  |  |  |  | $ 52 |  |  |  |  |  |  |  |  |  |  |  |  |
Number of natural gas storage fields | Fields |  |  |  |  |  |  |  | 1 |  |  |  |  |  |  |  |  |  |  |  |  |
Dominion Energy Gas Holdings, LLC | Uticaand Point Pleasant Shale [Member] | Oil and Gas Properties [Member] | Other operations and maintenance |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Gain from sale |  |  |  |  |  |  |  | $ 52 |  |  |  |  |  |  |  |  |  |  |  |  |
After tax gain on sale |  |  |  |  |  |  |  | $ 29 |  |  |  |  |  |  |  |  |  |  |  |  |
Virginia Electric and Power Company |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Project Cost |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 41 | $ 7 | $ 43 |  |
Virginia Electric and Power Company | Two Solar Development Projects |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of Projects | Project |  |  | 2 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Virginia Electric and Power Company | Scenario, Forecast | Two Solar Development Projects |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
MW Capacity | MW |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 155 |  |  |  |  |  |
Virginia Electric and Power Company | Scenario, Forecast | First Solar Development Project |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Project Cost |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 140 |  |  |  |  |
Virginia Electric and Power Company | Scenario, Forecast | Second Solar Development Project |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Project Cost |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 140 |  |  |  |  |  |
Virginia Electric and Power Company | Rental Portfolio of Electric Transmission Towers [Member] | Disposal Group, Disposed of by Sale, Not Discontinued Operations |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Amount of consideration |  |  |  |  |  | $ 91 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Amount recognized in other income from sale |  |  |  |  |  | 11 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Amount to be recognized in other income ratably through 2023 |  |  |  |  |  | $ 35 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |

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