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Schedule of Acquisitions of Solar Projects (Detail)
$ in Millions
 1 Months Ended 12 Months Ended
Mar. 31, 2019
MW
Dec. 31, 2021
USD ($)
MW
Dec. 31, 2020
USD ($)
Dec. 31, 2019
USD ($)
Property Plant And Equipment [Line Items]        
Project Cost   $ 101 $ 311 $ 341
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 Seabrook in South Carolina        
Property Plant And Equipment [Line Items]        
Date Agreement Entered   2019-09    
Date Agreement Closed   2019-09    
Project Cost [1]   $ 103    
Date of Commercial Operations   December 2019    
MW Capacity | MW   72    
Acquisition of Solar Project Wilkinson in North Carolina        
Property Plant And Equipment [Line Items]        
Date Agreement Entered   2019-11    
Date Agreement Closed   2019-11    
Project Cost [1]   $ 153    
Date of Commercial Operations   December 2019    
MW Capacity | MW   74    
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]   $ 125    
Date of Commercial Operations   Expected 2023    
MW Capacity | MW   62    
Acquisition of Solar Project Hardin II in Ohio        
Property Plant And Equipment [Line Items]        
Date Agreement Entered   2020-08    
Project Cost [1]   $ 295    
Date of Commercial Operations   Expected 2023    
MW Capacity | MW   150    
Virginia Electric and Power Company        
Property Plant And Equipment [Line Items]        
Project Cost   $ 75 $ 35 $ 182
MW Capacity | MW 1,292      
Virginia Electric and Power Company | Acquisition of Solar Project Gutenberg in North Carolina        
Property Plant And Equipment [Line Items]        
Date Agreement Entered   2017-09    
Date Agreement Closed   2019-06    
Project Cost [1]   $ 142    
Date of Commercial Operations   September 2019    
MW Capacity | MW   80    
Virginia Electric and Power Company | Acquisition of Solar Project Gloucester in Virginia        
Property Plant And Equipment [Line Items]        
Date Agreement Entered   2018-06    
Date Agreement Closed   2019-02    
Project Cost [1]   $ 37    
Date of Commercial Operations   April 2019    
MW Capacity | MW   20    
Virginia Electric and Power Company | Acquisition of Solar Project Grasshopper in Virginia        
Property Plant And Equipment [Line Items]        
Date Agreement Entered [3]   2018-08    
Date Agreement Closed [3]   2019-05    
Project Cost [1],[3]   $ 128    
Date of Commercial Operations [3]   October 2020    
MW Capacity | MW [3]   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 [1]   $ 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 [1]   $ 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 [4]   2019-06    
Date Agreement Closed [4]   2019-08    
Project Cost [1],[4]   $ 164    
Date of Commercial Operations [4]   June 2021    
MW Capacity | MW [4]   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 [1]   $ 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 [1]   $ 185    
Date of Commercial Operations   Expected 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 [1]   $ 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 [1]   $ 130    
Date of Commercial Operations   Expected 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 [1]   $ 200    
Date of Commercial Operations   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]

Referred to as Butcher Creek once placed in service.
[4]

Referred to as Desper once placed in service.