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Property, Plant and Equipment (Schedule of Nonregulated Solar Projects) (Detail)
$ in Millions
12 Months Ended
Dec. 31, 2022
USD ($)
MW
Dec. 31, 2021
USD ($)
Dec. 31, 2020
USD ($)
Property Plant And Equipment [Line Items]      
Project Cost $ 167 $ 101 $ 311
Acquisition of Solar Project Greensville in Virginia      
Property Plant And Equipment [Line Items]      
Date Agreement Entered 2019-08    
Date Agreement Closed 2019-08    
Project Cost [1] $ 127    
Date of Commercial Operations December 2020    
MW Capacity | MW 80    
Acquisition of Solar Project Myrtle in Virginia      
Property Plant And Equipment [Line Items]      
Date Agreement Entered 2019-08    
Date Agreement Closed 2019-08    
Project Cost [1] $ 32    
Date of Commercial Operations June 2020    
MW Capacity | MW 15    
Acquisition of Solar Project Blackville in South Carolina      
Property Plant And Equipment [Line Items]      
Date Agreement Entered 2020-05    
Date Agreement Closed 2020-05    
Project Cost [1] $ 12    
Date of Commercial Operations December 2020    
MW Capacity | MW 7    
Acquisition of Solar Project Denmark in South Carolina      
Property Plant And Equipment [Line Items]      
Date Agreement Entered 2020-05    
Date Agreement Closed 2020-05    
Project Cost [1] $ 14    
Date of Commercial Operations December 2020    
MW Capacity | MW 6    
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] 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 [4] 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],[5] Expected split    
MW Capacity | MW 200    
Virginia Electric and Power Company      
Property Plant And Equipment [Line Items]      
Project Cost $ 77 $ 75 $ 35
Virginia Electric and Power Company | Acquisition of Solar Project Grasshopper in Virginia      
Property Plant And Equipment [Line Items]      
Date Agreement Entered [6] 2018-08    
Date Agreement Closed [6] 2019-05    
Project Cost [6],[7] $ 128    
Date of Commercial Operations [6] October 2020    
MW Capacity | MW [6] 80    
Virginia Electric and Power Company | Acquisition of Solar Project Chestnut in North Carolina      
Property Plant And Equipment [Line Items]      
Date Agreement Entered 2018-08    
Date Agreement Closed 2019-05    
Project Cost [7] $ 127    
Date of Commercial Operations January 2020    
MW Capacity | MW 75    
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 [7] $ 267    
Date of Commercial Operations January 2022    
MW Capacity | MW 150    
Virginia Electric and Power Company | Acquisition of Solar Project Belcher in Virginia      
Property Plant And Equipment [Line Items]      
Date Agreement Entered [8] 2019-06    
Date Agreement Closed [8] 2019-08    
Project Cost [7],[8] $ 164    
Date of Commercial Operations [8] June 2021    
MW Capacity | MW [8] 88    
Virginia Electric and Power Company | Acquisition of Solar Project Bedford in Virginia      
Property Plant And Equipment [Line Items]      
Date Agreement Entered 2019-08    
Date Agreement Closed 2019-11    
Project Cost [7] $ 106    
Date of Commercial Operations November 2021    
MW Capacity | MW 70    
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 [7] $ 210    
Date of Commercial Operations December 2022    
MW Capacity | MW 120    
Virginia Electric and Power Company | Acquisition of Solar Project Rochambeau in Virginia      
Property Plant And Equipment [Line Items]      
Date Agreement Entered 2019-12    
Date Agreement Closed 2020-01    
Project Cost [7] $ 35    
Date of Commercial Operations December 2021    
MW Capacity | MW 20    
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 [7] $ 138    
Date of Commercial Operations September 2022    
MW Capacity | MW 60    
Virginia Electric and Power Company | Acquisition of Solar Project Bookers Mill in Virginia      
Property Plant And Equipment [Line Items]      
Date Agreement Entered 2021-02    
Date Agreement Closed 2021-06    
Project Cost [7] $ 225    
Date of Commercial Operations [9] Expected 2023    
MW Capacity | MW 127    
[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] In January 2023, Dominion Energy terminated its agreement, without penalty, to acquire Hardin II.
[5] Expected to be split between 2023 and 2024.
[6] Referred to as Butcher Creek once placed in service.
[7] Includes acquisition costs.
[8] Referred to as Desper once placed in service.
[9] Virginia Power expects to claim production tax credits on the energy generated and sold by project.