Acquisitions and Dispositions (Schedule of Unaudited Pro Forma Information) (Detail) - SCANA - USD ($) $ / shares in Units, $ in Millions		3 Months Ended	6 Months Ended
		Jun. 30, 2019	Jun. 30, 2019
Business Acquisition [Line Items]
Operating Revenue	[1]	$ 3,970	$ 8,835
Net income attributable to Dominion Energy	[1]	$ 392	$ 962
Earnings Per Common Share – Basic	[1]	$ 0.49	$ 1.21
Earnings Per Common Share – Diluted	[1]	$ 0.47	$ 1.19

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