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Acquisitions and Dispositions (Schedule of Acquisitions of Solar Projects) (Detail)
$ in Millions
 1 Months Ended 12 Months Ended
Oct. 31, 2017
USD ($)
Project
MW
Sep. 30, 2017
USD ($)
Project
MW
Jun. 30, 2017
USD ($)
Project
MW
May 31, 2017
USD ($)
Project
MW
Mar. 31, 2017
USD ($)
Project
MW
Feb. 28, 2017
USD ($)
Project
MW
Dec. 31, 2018
USD ($)
Dec. 31, 2017
USD ($)
Dec. 31, 2016
USD ($)
Business Acquisition [Line Items]                  
Project Cost             $ 151 $ 405 $ 40
Community Energy Solar, Inc                  
Business Acquisition [Line Items]                  
Number of Projects | Project           1      
Total consideration [1],[2]           $ 29      
Project Cost [3]           $ 205      
MW capacity | MW           100      
Solar Frontier Americas Holding, LLC                  
Business Acquisition [Line Items]                  
Number of Projects | Project [4]         1        
Total consideration [1],[2]         $ 77        
Project Cost [3]         $ 78        
MW capacity | MW         30        
Solar Projects from Cypress Creek Renewables, LLC                  
Business Acquisition [Line Items]                  
Number of Projects | Project       1          
Total consideration [1],[2]       $ 154          
Project Cost [3]       $ 160          
MW capacity | MW       79          
Hecate Energy Virginia C&C LLC                  
Business Acquisition [Line Items]                  
Number of Projects | Project   1 1            
Total consideration [1],[2]   $ 40 $ 16            
Project Cost [3]   $ 41 $ 16            
MW capacity | MW   20 10            
Strata Solar Development, LLC/Moorings Farm 2 Holdco, LLC                  
Business Acquisition [Line Items]                  
Number of Projects | Project     2            
Total consideration [1],[2]     $ 20            
Project Cost [3]     $ 20            
MW capacity | MW     10            
Strata Solar Development, LLC                  
Business Acquisition [Line Items]                  
Number of Projects | Project 2                
Total consideration [1],[2] $ 20                
Project Cost [3] $ 21                
MW capacity | MW 10                
[1] Includes $40 million for an equity method investment in White River Hub. The fair value adjustment on the equity method investment in White River Hub is considered to be equity method goodwill and is not amortized.
[2] The purchase price was primarily allocated to Property, Plant and Equipment.
[3] Includes acquisition cost.
[4] In April 2017, Dominion Energy discontinued efforts on the acquisition of the additional 20 MW solar project from Solar Frontier Americas Holding LLC.