Operating Segments (Tables)

3 Months Ended

Mar. 31, 2022

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, 2022
Dominion Energy South Carolina	$	849	$	104
Corporate and Other		—		(1	)
Consolidated total	$	849	$	103
Three Months Ended March 31, 2021
Dominion Energy South Carolina	$	744	$	97
Corporate and Other		—		(46	)
Consolidated total	$	744	$	51