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Acquisitions and Dispositions (Schedule of Unaudited Pro Forma Information) (Detail) - Dominion Energy Questar Corporation - USD ($) $ / shares in Units, $ in Millions | 3 Months Ended
--- | ---
Mar. 31, 2019 | Mar. 31, 2018
Business Acquisition [Line Items] |  |  |
Operating Revenue | [1] | $ 4,887 | $ 4,636
Net income attributable to Dominion Energy | [1] | $ 605 | $ 675
Earnings Per Common Share – Basic | [1] | $ 0.76 | $ 0.90
Earnings Per Common Share – Diluted | [1] | $ 0.76 | $ 0.90
[1] | Amounts include adjustments for non-recurring costs directly related to the SCANA Combination.

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