Acquisitions and Dispositions (Schedule of Unaudited Pro Forma Information) (Detail) - SCANA $ / shares in Units, $ in Millions	12 Months Ended
	Dec. 31, 2019 USD ($) $ / shares	[1]
Business Acquisition [Line Items]
Operating revenue | $	$ 15,408
Net income attributable to Dominion Energy | $	$ 3,266
Earnings Per Common Share – Basic | $ / shares	$ 4.04
Earnings Per Common Share – Diluted | $ / shares	$ 4.00

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