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Quarterly Financial and Common Stock Data (Unaudited) (Narrative) (Detail) - USD ($) $ in Millions | 3 Months Ended | 12 Months Ended
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Dec. 31, 2018 | Jun. 30, 2018 | Mar. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Parent Company Only Financial Information [Line Items] |  |  |  |  |  |  |
After-tax gains from the sale of certain merchant generation facilities | $ 536 |  |  |  |  |  |
After-tax impairment charge for certain gathering and processing assets | 164 |  |  |  |  |  |
After-taxcharge for disallowance of FERC-regulated plant |  | $ 89 |  |  |  |  |
After-taxcharge associated with Virginia legislation |  |  | $ 160 |  |  |  |
Tax benefit resulting from remeasurement of deferred income taxes as a result of the 2017 Tax Reform Act |  |  |  | $ (851) | $ 46 | $ (851) | $ 0
Charges associated with equity method investments in wind-powered generation facilities, after tax |  |  |  |  |  | 96 |
Virginia Electric and Power Company |  |  |  |  |  |  |
Parent Company Only Financial Information [Line Items] |  |  |  |  |  |  |
After-taxcharge associated with Virginia legislation |  |  | $ 160 |  |  |  |
Tax benefit resulting from remeasurement of deferred income taxes as a result of the 2017 Tax Reform Act |  |  |  | (93) | 21 | (93) | 0
Dominion Energy Gas Holdings, LLC |  |  |  |  |  |  |
Parent Company Only Financial Information [Line Items] |  |  |  |  |  |  |
After-tax gains from the sale of certain merchant generation facilities | $ 165 |  |  |  |  |  |
After-taxcharge for disallowance of FERC-regulated plant |  | $ 89 |  |  |  |  |
Tax benefit resulting from remeasurement of deferred income taxes as a result of the 2017 Tax Reform Act |  |  |  | $ (197) | $ (11) | $ (197) | $ 0

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