Operating Segments (Tables)

9 Months Ended

Sep. 30, 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 September 30, 2020
Dominion Energy South Carolina	$	755		$	153
Corporate and Other		—			(52	)
Consolidated Total	$	755		$	101
Three Months Ended September 30, 2019
Dominion Energy South Carolina	$	795		$	168
Corporate and Other		—			(25	)
Consolidated Total	$	795		$	143
Nine Months Ended September 30, 2020
Dominion Energy South Carolina	$	2,051		$	319
Corporate and Other		—			(61	)
Consolidated Total	$	2,051		$	258
Nine Months Ended September 30, 2019
Dominion Energy South Carolina	$	2,167		$	320
Corporate and Other		(1,009	)		(1,364	)
Consolidated Total	$	1,158		$	(1,044	)