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Acquisitions and Dispositions (Schedule of Unaudited Pro Forma Information) (Detail) - Dominion Energy Questar Corporation - USD ($) $ / shares in Units, $ in Millions | 12 Months Ended
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Dec. 31, 2018 | [1] | Dec. 31, 2016 | [2]
Business Acquisition [Line Items] |  |
Operating Revenue | $ 17,505 | $ 12,497
Net income attributable to Dominion Energy | $ 2,081 | $ 2,300
Earnings Per Common Share - Basic | $ 2.78 | $ 3.73
Earnings Per Common Share - Diluted | $ 2.77 | $ 3.73
[1] | Amounts include adjustments for non-recurring costs directly related to the SCANA Combination.
[2] | Amounts include adjustments for non-recurring costs directly related to the Dominion Energy Questar Combination.

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