Property, Plant and Equipment (Schedule of Nonregulated Solar Projects) (Detail) $ in Millions		12 Months Ended
		Dec. 31, 2023 USD ($) MW	Dec. 31, 2022 USD ($)	Dec. 31, 2021 USD ($)
Property Plant And Equipment [Line Items]
Project Cost		$ 24	$ 167	$ 101
Acquisition of Solar Project Yemassee in South Carolina
Property Plant And Equipment [Line Items]
Date Agreement Entered		2020-05
Date Agreement Closed		2020-08
Project Cost	[1]	$ 17
Date of Commercial Operations		January 2021
MW Capacity | MW		10
Acquisition of Solar Project Trask in South Carolina
Property Plant And Equipment [Line Items]
Date Agreement Entered		2020-05
Date Agreement Closed		2020-10
Project Cost	[1]	$ 22
Date of Commercial Operations		March 2021
MW Capacity | MW		12
Acquisition of Solar Project Hardin I in Ohio
Property Plant And Equipment [Line Items]
Date Agreement Entered		2020-06
Date Agreement Closed		2020-06
Project Cost	[1]	$ 240
Date of Commercial Operations	[2]	Split
MW Capacity | MW		150
Acquisition of Solar Project Madison in Virginia
Property Plant And Equipment [Line Items]
Date Agreement Entered		2020-07
Date Agreement Closed		2020-07
Project Cost	[1]	$ 165
Date of Commercial Operations	[3],[4]	Expected 2024
MW Capacity | MW		62
Acquisition of Solar Project Hardin II in Ohio
Property Plant And Equipment [Line Items]
Date Agreement Entered		2020-08
Date Agreement Closed	[5]	Terminated
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	[1]	$ 390
Date of Commercial Operations	[3]	Expected 2024
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	[1]	$ 205
Date of Commercial Operations	[3]	Expected 2024(3
MW Capacity | MW		83
Virginia Electric and Power Company
Property Plant And Equipment [Line Items]
Project Cost		$ 24	$ 77	$ 75
Virginia Electric and Power Company | Acquisition of Solar Project Ft. Powhatan in Virginia
Property Plant And Equipment [Line Items]
Date Agreement Entered	[6]	2019-06
Date Agreement Closed	[6]	2019-06
Project Cost	[6],[7]	$ 267
Date of Commercial Operations	[6]	January 2022
MW Capacity | MW	[6]	150
Virginia Electric and Power Company | Acquisition of Solar Project Belcher in Virginia
Property Plant And Equipment [Line Items]
Date Agreement Entered	[6],[8]	2019-06
Date Agreement Closed	[6],[8]	2019-08
Project Cost	[6],[7],[8]	$ 164
Date of Commercial Operations	[6],[8]	June 2021
MW Capacity | MW	[6],[8]	88
Virginia Electric and Power Company | Acquisition of Solar Project Bedford in Virginia
Property Plant And Equipment [Line Items]
Date Agreement Entered	[6]	2019-08
Date Agreement Closed	[6]	2019-11
Project Cost	[6],[7]	$ 106
Date of Commercial Operations	[6]	November 2021
MW Capacity | MW	[6]	70
Virginia Electric and Power Company | Acquisition of Solar Project Maplewood in Virginia
Property Plant And Equipment [Line Items]
Date Agreement Entered	[6]	2019-10
Date Agreement Closed	[6]	2019-10
Project Cost	[6],[7]	$ 210
Date of Commercial Operations	[6]	December 2022
MW Capacity | MW	[6]	120
Virginia Electric and Power Company | Acquisition of Solar Project Rochambeau in Virginia
Property Plant And Equipment [Line Items]
Date Agreement Entered	[6]	2019-12
Date Agreement Closed	[6]	2020-01
Project Cost	[6],[7]	$ 35
Date of Commercial Operations	[6]	December 2021
MW Capacity | MW	[6]	20
Virginia Electric and Power Company | Acquisition of Solar Project Pumpkinseed in Virginia
Property Plant And Equipment [Line Items]
Date Agreement Entered	[6]	2020-05
Date Agreement Closed	[6]	2020-05
Project Cost	[6],[7]	$ 138
Date of Commercial Operations	[6]	September 2022
MW Capacity | MW	[6]	60

[1] Includes acquisition costs.

[2] In December 2020 and January 2021, 97 MW and 53 MW of the project commenced commercial operations, respectively.

[3] Dominion Energy expects to claim production tax credits on the energy generated and sold by project.

[4] Madison is reflected in the Corporate and Other segment effective December 2023.

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

[6] During 2023, Virginia Power determined the Bookers Mill solar project under development will be utilized to support its utility customers and included the project in its most recent Rider CE application. See Note 13 for additional information.

[7] Includes acquisition costs.

[8] Referred to as Desper once placed in service.