Operating Segments (Schedule of Segment Reporting Information, by Segment, Virginia Power) (Detail) - USD ($) $ in Millions		3 Months Ended		6 Months Ended
		Jun. 30, 2024	Jun. 30, 2023	Jun. 30, 2024	Jun. 30, 2023
Segment Reporting Information [Line Items]
Operating Revenue		$ 3,486	$ 3,166	$ 7,118	$ 7,049
Net Income (Loss)		572	583	1,246	1,564
Virginia Electric and Power Company
Segment Reporting Information [Line Items]
Operating Revenue	[1]	2,537	2,252	5,026	4,636
Net Income (Loss)		479	334	944	689
Dominion Energy Virginia | Virginia Electric and Power Company
Segment Reporting Information [Line Items]
Operating Revenue		2,537	2,252	5,026	4,636
Net Income (Loss)		485	394	909	780
Corporate and Other | Virginia Electric and Power Company
Segment Reporting Information [Line Items]
Operating Revenue		0	0	0	0
Net Income (Loss)		$ (6)	$ (60)	$ 35	$ (91)

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