Property, Plant and Equipment (Share of Jointly-Owned Power Stations) (Detail) $ in Millions	Dec. 31, 2023 USD ($)
Bath Country Pumped Storage Station
Jointly Owned Utility Plant Interests [Line Items]
Ownership interest	60.00%	[1]
Plant in service	$ 1,066	[1]
Accumulated depreciation	(766)	[1]
Plant under construction	$ 9	[1]
North Anna
Jointly Owned Utility Plant Interests [Line Items]
Ownership interest	88.40%	[1]
Plant in service	$ 2,632	[1]
Accumulated depreciation	(1,455)	[1]
Nuclear fuel	787	[1]
Accumulated amortization of nuclear fuel	(619)	[1]
Plant under construction	$ 337	[1]
Clover Power Station
Jointly Owned Utility Plant Interests [Line Items]
Ownership interest	50.00%	[1]
Plant in service	$ 612	[1]
Accumulated depreciation	(302)	[1]
Plant under construction	$ 2	[1]
Millstone Unit
Jointly Owned Utility Plant Interests [Line Items]
Ownership interest	93.50%	[2]
Plant in service	$ 1,513	[2]
Accumulated depreciation	(604)	[2]
Nuclear fuel	540	[2]
Accumulated amortization of nuclear fuel	(412)	[2]
Plant under construction	$ 81	[2]
Summer Unit
Jointly Owned Utility Plant Interests [Line Items]
Ownership interest	66.70%	[2]
Plant in service	$ 1,557	[2]
Accumulated depreciation	(744)	[2]
Nuclear fuel	609	[2]
Accumulated amortization of nuclear fuel	(380)	[2]
Plant under construction	$ 87	[2]

[1] Units jointly owned by Virginia Power.

[2] Units jointly owned by Dominion Energy.