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Property Plant and Equipment (Narrative) (Detail) - Dominion Energy Gas Holdings, LLC - Oil and Gas Properties $ in Millions | 1 Months Ended | 3 Months Ended |
--- | --- | --- | ---
Sep. 30, 2018 USD ($) | Jun. 30, 2018 USD ($) a field | Mar. 31, 2018 USD ($) a field | Feb. 28, 2018 USD ($) | Jan. 31, 2018 a | Aug. 31, 2017 USD ($) a | Dec. 31, 2013 USD ($) a | Dec. 31, 2017 USD ($) | Nov. 30, 2014 a field
Marcellus Shale |  |  |  |  |  |  |  |  |
Property Plant And Equipment [Line Items] |  |  |  |  |  |  |  |  |
Development rights (number of acres) | a |  | 9,000 |  |  | 18,000 |  | 100,000 |  | 24,000
Amount of consideration |  | $ 6 |  | $ 28 |  |  |  |  |
Period for payments related to conveyance of natural gas storage fields |  |  |  |  |  |  | 9 years |  |
Gas and oil area developed net remaining interest conveyed percentage |  |  |  |  | 50.00% |  |  |  |
Gain on sale |  | 6 |  |  |  |  |  |  |
After tax gain on sale |  | $ 4 |  |  |  |  |  |  |
Number of natural gas storage fields | field |  | 1 |  |  |  |  |  |  | 1
Marcellus Shale | Other operations and maintenance |  |  |  |  |  |  |  |  |
Property Plant And Equipment [Line Items] |  |  |  |  |  |  |  |  |
Gain on sale |  |  |  | 28 |  |  |  |  |
After tax gain on sale |  |  |  | $ 20 |  |  |  |  |
Marcellus Shale | Maximum [Member] |  |  |  |  |  |  |  |  |
Property Plant And Equipment [Line Items] |  |  |  |  |  |  |  |  |
Amount of consideration |  |  |  |  |  |  | $ 200 |  |
Marcellus Shale | Amended Agreement to Extend Conveyance of Development Rights |  |  |  |  |  |  |  |  |
Property Plant And Equipment [Line Items] |  |  |  |  |  |  |  |  |
Development rights (number of acres) | a |  |  |  |  |  | 70,000 |  |  |
Gas and oil area developed net remaining interest conveyed percentage |  |  |  |  |  | 68.00% |  |  |
Total consideration | $ 65 |  |  |  |  | $ 130 |  | $ 65 |
Marcellus Shale | Final Conveyance | Amended Agreement to Extend Conveyance of Development Rights |  |  |  |  |  |  |  |  |
Property Plant And Equipment [Line Items] |  |  |  |  |  |  |  |  |
Gain on sale | 65 |  |  |  |  |  |  |  |
After tax gain on sale | $ 47 |  |  |  |  |  |  |  |
Utica and Point Pleasant Shale |  |  |  |  |  |  |  |  |
Property Plant And Equipment [Line Items] |  |  |  |  |  |  |  |  |
Development rights (number of acres) | a |  |  | 11,000 |  |  |  |  |  |
Amount of consideration |  |  | $ 16 |  |  |  |  |  |
Gain on sale |  |  | 16 |  |  |  |  |  |
After tax gain on sale |  |  | $ 12 |  |  |  |  |  |
Number of natural gas storage fields | field |  |  | 1 |  |  |  |  |  |
Proceeds from assignment of Shale Development Rights |  |  | $ 16 |  |  |  |  |  |

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