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Variable Interest Entities - Additional Information (Details) - Variable Interest Entity, Primary Beneficiary
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2020
USD ($)
Sep. 30, 2019
USD ($)
Mar. 31, 2019
MW
Sep. 30, 2020
USD ($)
Sep. 30, 2019
USD ($)
Texas Solar 4          
Variable Interest Entity [Line Items]          
Generating capacity (MW AC) | MW     40    
Tax Equity Projects          
Variable Interest Entity [Line Items]          
Net income (loss) $ 7     $ (3)  
Income (loss) before tax $ 5     $ (2)  
Con Edison Development | Texas Solar 4          
Variable Interest Entity [Line Items]          
Percentage of variable interests (less than)     80.00%    
Ownership percentage acquired 20.00%     20.00%  
Con Edison Development | Tax Equity Projects          
Variable Interest Entity [Line Items]          
Percentage of variable interests (less than)       100.00%  
Net income (loss)   $ (13)     $ (47)
Income (loss) before tax   (10)     (36)
Tax Equity Investors | Tax Equity Projects          
Variable Interest Entity [Line Items]          
Net income (loss) $ 9 30   $ 38 79
Income (loss) before tax $ 7 $ 23   $ 29 $ 60