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Property Plant and Equipment (Narrative) (Detail) $ in Millions | 1 Months Ended | 3 Months Ended | 12 Months Ended |
--- | --- | --- | --- | ---
Apr. 30, 2019 USD ($) MW | Jan. 31, 2019 MW | Aug. 31, 2018 project | Mar. 31, 2018 USD ($) a field | Feb. 28, 2018 USD ($) | Jan. 31, 2018 a | Mar. 31, 2019 USD ($) | Mar. 31, 2018 USD ($) a field | Dec. 31, 2020 USD ($) MW | Dec. 31, 2019 USD ($) | Nov. 30, 2014 a field
Property Plant And Equipment [Line Items] |  |  |  |  |  |  |  |  |  |  |
Cost of project |  |  |  |  |  |  | $ 29 | $ 7 |  |  |
Virginia Electric and Power Company |  |  |  |  |  |  |  |  |  |  |
Property Plant And Equipment [Line Items] |  |  |  |  |  |  |  |  |  |  |
Cost of project |  |  |  |  |  |  | $ 27 |  |  |  |
MW Capacity | MW |  | 1,292 |  |  |  |  |  |  |  |  |
Virginia Electric and Power Company | Solar Development Project in Virginia |  |  |  |  |  |  |  |  |  |  |
Property Plant And Equipment [Line Items] |  |  |  |  |  |  |  |  |  |  |
Cost of project | $ 37 |  |  |  |  |  |  |  |  |  |
MW Capacity | MW | 20 |  |  |  |  |  |  |  |  |  |
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 | Two Solar Development Projects | Scenario Forecast |  |  |  |  |  |  |  |  |  |  |
Property Plant And Equipment [Line Items] |  |  |  |  |  |  |  |  |  |  |
MW Capacity | MW |  |  |  |  |  |  |  |  | 155 |  |
Virginia Electric and Power Company | First Solar Development Project | Subsequent Event |  |  |  |  |  |  |  |  |  |  |
Property Plant And Equipment [Line Items] |  |  |  |  |  |  |  |  |  |  |
Cost of project |  |  |  |  |  |  |  |  |  | $ 120 |
Virginia Electric and Power Company | Second Solar Development Project | Scenario Forecast |  |  |  |  |  |  |  |  |  |  |
Property Plant And Equipment [Line Items] |  |  |  |  |  |  |  |  |  |  |
Cost of project |  |  |  |  |  |  |  |  | $ 130 |  |
Dominion Energy Gas Holdings, LLC | Marcellus Shale | Oil and Gas Properties |  |  |  |  |  |  |  |  |  |  |
Property Plant And Equipment [Line Items] |  |  |  |  |  |  |  |  |  |  |
Development rights (number of acres) | a |  |  |  |  |  | 18,000 |  |  |  |  | 24,000
Number of natural gas storage fields | field |  |  |  |  |  |  |  |  |  |  | 1
Gas and oil area developed net remaining interest conveyed percentage |  |  |  |  |  | 50.00% |  |  |  |  |
Amount of consideration |  |  |  |  | $ 28 |  |  |  |  |  |
Dominion Energy Gas Holdings, LLC | Utica and Point Pleasant Shale | Oil and Gas Properties |  |  |  |  |  |  |  |  |  |  |
Property Plant And Equipment [Line Items] |  |  |  |  |  |  |  |  |  |  |
Development rights (number of acres) | a |  |  |  | 11,000 |  |  |  | 11,000 |  |  |
Number of natural gas storage fields | field |  |  |  | 1 |  |  |  | 1 |  |  |
Amount of consideration |  |  |  | $ 16 |  |  |  | $ 16 |  |  |
Proceeds from assignment of Shale Development Rights |  |  |  | 16 |  |  |  |  |  |  |
Dominion Energy Gas Holdings, LLC | Other operations and maintenance | Marcellus Shale | Oil and Gas Properties |  |  |  |  |  |  |  |  |  |  |
Property Plant And Equipment [Line Items] |  |  |  |  |  |  |  |  |  |  |
Gain on sale |  |  |  |  | 28 |  |  |  |  |  |
After tax gain on sale |  |  |  |  | $ 20 |  |  |  |  |  |
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 |  |  |  |  |  |  |

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