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Property Plant and Equipment (Narrative) (Detail) $ in Millions | 1 Months Ended | 3 Months Ended |
--- | --- | --- | ---
Mar. 31, 2018 USD ($) a field | Feb. 28, 2018 USD ($) | Jan. 31, 2018 a | Mar. 31, 2018 USD ($) a field | Mar. 31, 2017 USD ($) | Nov. 30, 2014 a field
Virginia Electric and Power Company | Assignment of Tower Rental Portfolio | Disposal Group, Disposed of by Sale, Not Discontinued Operations |  |  |  |  |  |
Property Plant And Equipment [Line Items] |  |  |  |  |  |
Amount of consideration |  |  |  |  | $ 91 |
Amount recognized in operating revenue and other income from sale |  |  |  | $ 2 | $ 7 |
Amount to be recognized in other income ratably through 2023 | $ 33 |  |  | 33 |  |
Dominion Energy Gas Holdings, LLC | Marcellus Shale | Oil and Gas Properties |  |  |  |  |  |
Property Plant And Equipment [Line Items] |  |  |  |  |  |
Amount of consideration |  | $ 28 |  |  |  |
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% |  |  |
Dominion Energy Gas Holdings, LLC | Marcellus Shale | Oil and Gas Properties | 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 | Oil and Gas Properties |  |  |  |  |  |
Property Plant And Equipment [Line Items] |  |  |  |  |  |
Amount of consideration | $ 16 |  |  | $ 16 |  |
Development rights (number of acres) | a | 11,000 |  |  | 11,000 |  |
Number of natural gas storage fields | field | 1 |  |  | 1 |  |
Proceeds from assignment of Shale Development Rights | $ 16 |  |  |  |  |
Dominion Energy Gas Holdings, LLC | Uticaand Point Pleasant Shale | Oil and Gas Properties | Other operations and maintenance |  |  |  |  |  |
Property Plant And Equipment [Line Items] |  |  |  |  |  |
Gain from sale | 16 |  |  |  |  |
After tax gain on sale | $ 12 |  |  |  |  |

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- Definition The excess amount received or due over net assets in a transaction accounted for as a divestiture where a subsidiary, business or operating assets are "sold" by the entity to a newly formed, thinly capitalized, highly leveraged buyer. This gain is not yet recognized and is disclosed on the balance sheet as an offset against the carrying amount of the securities received. + References No definition available. + Details
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