Operating Segments (Schedule of Segment Reporting Information, by Segment, Virginia Power) (Detail) - USD ($) $ in Millions		3 Months Ended		6 Months Ended
		Jun. 30, 2022	Jun. 30, 2021	Jun. 30, 2022	Jun. 30, 2021
Segment Reporting Information [Line Items]
Operating Revenue		$ 3,596	$ 3,038	$ 7,875	$ 6,908
Net income (loss) attributable to Dominion Energy		(453)	285	258	1,293
Virginia Electric and Power Company
Segment Reporting Information [Line Items]
Operating Revenue	[1]	2,175	1,741	4,342	3,571
Net income (loss) attributable to Dominion Energy		47	414	404	788
Dominion Energy Virginia
Segment Reporting Information [Line Items]
Operating Revenue		2,172	1,747	4,341	3,732
Dominion Energy Virginia | Virginia Electric and Power Company
Segment Reporting Information [Line Items]
Operating Revenue		2,170	1,741	4,335	3,722
Net income (loss) attributable to Dominion Energy		442	429	958	861
Corporate and Other
Segment Reporting Information [Line Items]
Operating Revenue		108	120	180	220
Corporate and Other | Virginia Electric and Power Company
Segment Reporting Information [Line Items]
Operating Revenue		5	0	7	(151)
Net income (loss) attributable to Dominion Energy		$ (395)	$ (15)	$ (554)	$ (73)

[1] See Note 19 for amounts attributable to affiliates.