Property, Plant and Equipment (Schedule of Nonregulated Solar Projects) (Detail) $ in Millions		12 Months Ended
		Dec. 31, 2024 USD ($) MW	Dec. 31, 2023 USD ($)	Dec. 31, 2022 USD ($)
Property Plant And Equipment [Line Items]
Project Cost		$ 229	$ 24	$ 167
Acquisition of Solar Project Hardin I in Ohio
Property Plant And Equipment [Line Items]
Date Agreement Entered		2020-08
Date Agreement Closed	[1]	Terminated
Acquisition of Solar Project Madison in Virginia
Property Plant And Equipment [Line Items]
Date Agreement Entered	[2]	2020-07
Date Agreement Closed	[2]	2020-07
Project Cost	[2],[3]	$ 165
MW Capacity | MW	[2]	62
Acquisition Of Solar Project Atlanta Farms In Ohio
Property Plant And Equipment [Line Items]
Date Agreement Entered		2022-03
Date Agreement Closed		2022-05
Project Cost	[3]	$ 390
Date of Commercial Operations	[4]	January 2025
MW Capacity | MW		200
Acquisition of Solar Project Foxhound in Virginia
Property Plant And Equipment [Line Items]
Date Agreement Entered		2023-03
Date Agreement Closed		2024-02
Project Cost	[3]	$ 195
Date of Commercial Operations	[4]	April 2024
MW Capacity | MW		83
Virginia Electric and Power Company
Property Plant And Equipment [Line Items]
Project Cost		$ 40	$ 24	$ 77
Virginia Electric and Power Company | Acquisition of Solar Project Ft. Powhatan in Virginia
Property Plant And Equipment [Line Items]
Date Agreement Entered		2019-06
Date Agreement Closed		2019-06
Project Cost	[5]	$ 267
Date of Commercial Operations		January 2022
MW Capacity | MW		150
Virginia Electric and Power Company | Acquisition of Solar Project Maplewood in Virginia
Property Plant And Equipment [Line Items]
Date Agreement Entered		2019-10
Date Agreement Closed		2019-10
Project Cost	[5]	$ 210
Date of Commercial Operations		December 2022
MW Capacity | MW		120
Virginia Electric and Power Company | Acquisition of Solar Project Pumpkinseed in Virginia
Property Plant And Equipment [Line Items]
Date Agreement Entered		2020-05
Date Agreement Closed		2020-05
Project Cost	[5]	$ 138
Date of Commercial Operations		September 2022
MW Capacity | MW		60

[1] In January 2023, Dominion Energy terminated its agreement, without penalty, to acquire Hardin II.

[2] Madison was reflected in the Corporate and Other segment before its sale 2024. See Note 3 for discussion.

[3] Includes acquisition costs.

[4] Dominion Energy expects to claim production tax credits on the energy generated and sold by these projects.

[5] Includes acquisition costs.