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Property, Plant and Equipment (Narrative) (Detail) $ in Millions | 1 Months Ended | 3 Months Ended | 12 Months Ended |  |  |
--- | --- | --- | --- | --- | --- | ---
Sep. 30, 2018 USD ($) | Aug. 31, 2018 Project | Jun. 30, 2018 USD ($) a field | Mar. 31, 2018 USD ($) a field | Jan. 31, 2018 USD ($) a | Dec. 31, 2017 USD ($) | Sep. 30, 2017 Project | Aug. 31, 2017 USD ($) a | Jul. 31, 2017 USD ($) a | Apr. 30, 2016 a | Mar. 31, 2015 USD ($) a | Nov. 30, 2014 USD ($) a field | Mar. 31, 2019 USD ($) MW | Dec. 31, 2018 USD ($) | Dec. 31, 2017 USD ($) | Sep. 30, 2017 USD ($) | Dec. 31, 2020 USD ($) MW | Dec. 31, 2019 USD ($) MW | Dec. 31, 2018 USD ($) | Dec. 31, 2017 USD ($) | Dec. 31, 2016 USD ($) a | Dec. 31, 2014 USD ($) | Dec. 31, 2013 USD ($) a | Oct. 31, 2018 USD ($) | Oct. 31, 2017 USD ($) | Mar. 31, 2017 USD ($)
Property, Plant and Equipment [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cost of project |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 151 | $ 405 | $ 40 |  |  |  |  |
Revenue recognized |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 94 |  |  |  |  |  |  |
Virginia Electric and Power Company |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cost of project |  |  |  |  |  |  |  |  |  |  |  |  | $ 37 |  |  |  |  |  | 141 | 41 | 7 |  |  |  |  |
MW capacity | MW |  |  |  |  |  |  |  |  |  |  |  |  | 20 |  |  |  |  |  |  |  |  |  |  |  |  |
Revenue recognized |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 25 |  |  |  |  |  |  |
Virginia Electric and Power Company | Two Solar Development Projects |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of Projects | Project |  | 2 |  |  |  |  | 2 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Virginia Electric and Power Company | First Solar Development Project |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cost of project |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 140 |  |  |  |  |  |  |  |  |  |  |  |
Dominion Energy Gas Holdings, LLC |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revenue recognized |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 3 |  |  |  |  |  |  |
Dominion Energy Gas Holdings, LLC | Marcellus Shale | Oil and Gas Properties |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Amount of consideration |  |  | $ 6 |  | $ 28 |  |  |  | $ 5 |  |  | $ 120 |  |  |  |  |  |  |  |  | $ 10 |  | $ 200 |  |  |
Number of natural gas producers |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 2 |  |  |
Development rights (number of acres) | a |  |  | 9,000 |  | 18,000 |  |  |  | 2,000 |  |  | 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 |  |  |  |  |  |  |  |  |  |  |  | $ 60 |  |  |  |  |  |  |  |  |  | $ 16 | $ 100 |  |  |
Gas and oil area developed net remaining interest conveyed percentage |  |  |  |  | 50.00% |  |  |  | 50.00% |  |  |  |  |  |  |  |  |  |  |  | 50.00% |  |  |  |  |
Number of natural gas storage fields | field |  |  | 1 |  |  |  |  |  |  |  |  | 1 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of acres included in initial conveyance | a |  |  |  |  |  |  |  |  |  |  |  | 12,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Dominion Energy Gas Holdings, LLC | Marcellus Shale | Amended Agreement to Extend Conveyance of Development Rights | Oil and Gas Properties |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Gain on sale |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 9 | $ 56 |  |  |  |  |  |  |  |  |  |
After tax gain on sale |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 5 | $ 33 |  |  |  |  |  |  |  |  |  |
Development rights (number of acres) | a |  |  |  |  |  |  |  | 70,000 |  | 70,000 | 9,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Period for payments related to conveyance of natural gas storage fields |  |  |  |  |  |  |  |  |  |  | 2 years |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Gas and oil area developed net remaining interest conveyed percentage |  |  |  |  |  |  |  | 68.00% |  | 32.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total consideration | $ 65 |  |  |  |  |  |  | $ 130 |  |  |  |  |  |  | 65 |  |  |  |  |  |  |  |  |  |  |
Dominion Energy Gas Holdings, LLC | Marcellus Shale | Final Conveyance | Amended Agreement to Extend Conveyance of Development Rights | Oil and Gas Properties |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Gain on sale | 65 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
After tax gain on sale | 47 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Dominion Energy Gas Holdings, LLC | Utica and Point Pleasant Shale | Oil and Gas Properties |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Amount of consideration |  |  |  | $ 16 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Development rights (number of acres) | a |  |  |  | 11,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Proceeds from assignment of Shale Development Rights |  |  |  | $ 16 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of natural gas storage fields | field |  |  |  | 1 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Dominion Energy Gas Holdings, LLC | Other operations and maintenance | Marcellus Shale | Oil and Gas Properties |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Gain on sale |  |  | $ 6 |  | $ 28 |  |  |  | $ 5 |  |  |  |  |  |  |  |  |  |  |  | $ 10 |  |  |  |  |
After tax gain on sale |  |  | $ 4 |  | $ 20 |  |  |  | $ 3 |  |  |  |  |  |  |  |  |  |  |  | $ 6 |  |  |  |  |
Dominion Energy Gas Holdings, LLC | Other operations and maintenance | Marcellus Shale | Amended Agreement to Extend Conveyance of Development Rights | Oil and Gas Properties |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revenue recognized | 35 |  |  |  |  |  |  |  |  |  | $ 43 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revenue recognized net of tax | $ 21 |  |  |  |  |  |  |  |  |  | $ 27 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Dominion Energy Gas Holdings, LLC | Other operations and maintenance | Utica and Point Pleasant Shale | Oil and Gas Properties |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Gain on sale |  |  |  | $ 16 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
After tax gain on sale |  |  |  | $ 12 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Scenario, Forecast | Virginia Electric and Power Company | Two Solar Development Projects |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
MW capacity | MW |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 155 | 155 |  |  |  |  |  |  |  |
Scenario, Forecast | Virginia Electric and Power Company | First Solar Development Project |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cost of project |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 120 |  |  |  |  |  |  |  |
Scenario, Forecast | Virginia Electric and Power Company | Second Solar Development Project |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cost of project |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 130 | $ 140 |  |  |  |  |  |  |  |
Retail Energy Marketing Assets | Disposal Group, Disposed of by Sale, Not Discontinued Operations |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Amount of consideration |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 143 |
Contractual term of agreement to use brand |  |  |  |  |  | 10 years |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Gain on sale |  |  |  |  |  | $ 78 |  |  |  |  |  |  |  | 65 |  |  |  |  |  |  |  |  |  |  |  |
After tax gain on sale |  |  |  |  |  | 48 |  |  |  |  |  |  |  | 49 |  |  |  |  |  |  |  |  |  |  |  |
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 |  |  |  |  |  |
Retail Energy Marketing Assets | Disposal Group, Disposed of by Sale, Not Discontinued Operations | Second Phase of Agreements to Sell Certain Assets |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Amount of consideration |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 63 |  |
Fairless and Manchester |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Amount of consideration |  |  |  |  |  |  |  |  |  |  |  |  |  | 1,200 |  |  |  |  | 1,200 |  |  |  |  |  |  |
Gain on sale of equity method investment |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 210 |  |  |  |  |  |  |
Gain on sale of equity method investments, net of tax |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 198 |  |  |  |  |  |  |
Assignment of Tower Rental Portfolio | Disposal Group, Disposed of by Sale, Not Discontinued Operations | Virginia Electric and Power Company |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Amount of consideration |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 91
Amount recognized in operating revenue and other income from sale |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 6 | $ 11 |  |  |  |  |  |
Amount to be recognized in other income ratably through 2023 |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 29 |  |  |  |  | $ 29 |  |  |  |  |  |  |

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