Operating Segments (Tables)

3 Months Ended

Mar. 31, 2020

Segment Reporting [Abstract]

Schedule of Segment Reporting Information, by Segment

(millions)	External Revenue			Comprehensive Income (Loss) Available (Attributable) to Common Shareholder
Three Months Ended March 31, 2020
Dominion Energy South Carolina	$	672		$	89
Corporate and Other		—			(1	)
Consolidated Total	$	672		$	88
Three Months Ended March 31, 2019
Dominion Energy South Carolina	$	674		$	64
Corporate and Other		(1,009	)		(1,173	)
Consolidated Total	$	(335	)	$	(1,109	)