Acquisitions and Dispositions (Schedule of Unaudited Pro Forma Information) (Detail) - SCANA $ / shares in Units, $ in Millions	3 Months Ended
	Mar. 31, 2019 USD ($) $ / shares	[1]
Business Acquisition [Line Items]
Operating Revenue | $	$ 4,887
Net income attributable to Dominion Energy | $	$ 605
Earnings Per Common Share – Basic | $ / shares	$ 0.76
Earnings Per Common Share – Diluted | $ / shares	$ 0.76

[1] Amounts include adjustments for non-recurring costs directly related to the SCANA Combination.