Operating Segments (Schedule of Segment Reporting Information, by Segment, Virginia Power) (Detail) - USD ($) $ in Millions		3 Months Ended
		Mar. 31, 2024	Mar. 31, 2023
Segment Reporting Information [Line Items]
Operating Revenue		$ 3,632	$ 3,883
Net Income (Loss)		674	981
Virginia Electric and Power Company
Segment Reporting Information [Line Items]
Operating Revenue	[1]	2,489	2,384
Net Income (Loss)		465	355
Dominion Energy Virginia | Virginia Electric and Power Company
Segment Reporting Information [Line Items]
Operating Revenue		2,489	2,384
Net Income (Loss)		424	386
Corporate and Other | Virginia Electric and Power Company
Segment Reporting Information [Line Items]
Operating Revenue		0	0
Net Income (Loss)		$ 41	$ (31)

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