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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, 2019
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) $ (15) $ (34)  
Income (loss) before tax (12) (26)  
Con Edison Development | Texas Solar 4      
Variable Interest Entity [Line Items]      
Percentage of variable interests (less than)     80.00%
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) 28 49  
Income (loss) before tax $ 21 $ 37