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Property, Plant and Equipment (Narrative) (Detail)
$ in Millions
1 Months Ended 6 Months Ended
Jun. 30, 2022
USD ($)
Jun. 30, 2023
USD ($)
MW
Jun. 30, 2022
USD ($)
Property Plant And Equipment [Line Items]      
Project Cost   $ 12 $ 121
Acquisition of Solar Project Foxhound Virginia      
Property Plant And Equipment [Line Items]      
Date Agreement Entered   2023-03  
Date Agreement Closed   Excepted 2024  
Project Cost   $ 205  
Date of Commercial Operations   Excepted 2024  
MW Capacity | MW   83  
Utility Property      
Property Plant And Equipment [Line Items]      
Sale of utility property $ 16    
Gain on sale of asset 16    
Gain on sale of asset after tax $ 12