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Variable Interest Entities - Additional Information (Details) - Variable Interest Entity, Primary Beneficiary
$ in Millions
3 Months Ended 9 Months Ended 12 Months Ended
Sep. 30, 2019
USD ($)
Sep. 30, 2019
USD ($)
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) $ (13) $ (47)  
Income (loss) before tax $ (10) $ (36)  
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%
Tax Equity Investors | Tax Equity Projects      
Variable Interest Entity [Line Items]      
Net income (loss) $ 30 $ 79  
Income (loss) before tax $ 23 $ 60