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Investments Accounted for by the Equity Method and Variable Interest Entities - Unconsolidated Entities (Details)
$ in Millions
6 Months Ended
Jun. 30, 2019
USD ($)
MW
Dec. 31, 2018
USD ($)
Schedule of Equity Method Investments [Line Items]    
Equity investments in affiliates $ 1,165 $ 1,172
Four Brothers Solar [Member]    
Schedule of Equity Method Investments [Line Items]    
Equity investments in affiliates 187  
Gen Conn Energy LLC [Member]    
Schedule of Equity Method Investments [Line Items]    
Equity investments in affiliates 96  
DGPV Holdco 3 [Member]    
Schedule of Equity Method Investments [Line Items]    
Equity investments in affiliates 140  
Payments to acquire equity method investments $ 8  
Power generation capacity, megawatts | MW 59  
Remaining lease term 21 years  
Due to affiliate $ 19  
DGPV Holdco 1 [Member]    
Schedule of Equity Method Investments [Line Items]    
Equity investments in affiliates 83  
Payments to acquire equity method investments $ 2  
Power generation capacity, megawatts | MW 52  
Remaining lease term 17 years  
Granite Mountain Holdings [Member]    
Schedule of Equity Method Investments [Line Items]    
Equity investments in affiliates $ 67  
DGPV Holdco 2 [Member]    
Schedule of Equity Method Investments [Line Items]    
Equity investments in affiliates 62  
Iron Springs Holdings [Member]    
Schedule of Equity Method Investments [Line Items]    
Equity investments in affiliates 49  
RPV Holdco [Member]    
Schedule of Equity Method Investments [Line Items]    
Equity investments in affiliates $ 22