Property, Plant and Equipment (Share of Jointly-Owned Power Stations) (Detail) $ in Millions	Dec. 31, 2024 USD ($)
Bath Country Pumped Storage Station
Jointly Owned Utility Plant Interests [Line Items]
Ownership interest	60.00%	[1]
Plant in service	$ 1,069	[1]
Accumulated depreciation	(774)	[1]
Plant under construction	$ 12	[1]
North Anna
Jointly Owned Utility Plant Interests [Line Items]
Ownership interest	88.40%	[1]
Plant in service	$ 2,906	[1]
Accumulated depreciation	(1,403)	[1]
Nuclear fuel	767	[1]
Accumulated amortization of nuclear fuel	(620)	[1]
Plant under construction	$ 408	[1]
Clover Power Station
Jointly Owned Utility Plant Interests [Line Items]
Ownership interest	50.00%	[1]
Plant in service	$ 616	[1]
Accumulated depreciation	(312)	[1]
Plant under construction	$ 9	[1]
Millstone Unit
Jointly Owned Utility Plant Interests [Line Items]
Ownership interest	93.50%	[2]
Plant in service	$ 1,528	[2]
Accumulated depreciation	(628)	[2]
Nuclear fuel	619	[2]
Accumulated amortization of nuclear fuel	(475)	[2]
Plant under construction	$ 93	[2]
Summer Unit
Jointly Owned Utility Plant Interests [Line Items]
Ownership interest	66.70%	[2]
Plant in service	$ 1,598	[2]
Accumulated depreciation	(755)	[2]
Nuclear fuel	570	[2]
Accumulated amortization of nuclear fuel	(345)	[2]
Plant under construction	$ 58	[2]

[1] Units jointly owned by Virginia Power.

[2] Units jointly owned by Dominion Energy.