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Variable Interest Entities - Additional Information (Details) - Variable Interest Entity, Primary Beneficiary
$ in Millions
3 Months Ended 6 Months Ended 12 Months Ended
Jun. 30, 2020
USD ($)
Jun. 30, 2019
USD ($)
Jun. 30, 2020
USD ($)
Jun. 30, 2019
USD ($)
Dec. 31, 2018
MW
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) $ 4   $ (10)    
Income (loss) before tax $ 3   $ (8)    
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)   $ (15)   $ (34)  
Income (loss) before tax   (12)   (26)  
Tax Equity Investors | Tax Equity Projects          
Variable Interest Entity [Line Items]          
Net income (loss) $ 12 28 $ 29 49  
Income (loss) before tax $ 9 $ 21 $ 22 $ 37