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Variable Interest Entities - Additional Information (Details) - Variable Interest Entity, Primary Beneficiary
$ in Millions
3 Months Ended 12 Months Ended
Mar. 31, 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) $ (19)  
Income (loss) before tax (14)  
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) 21  
Income (loss) before tax $ 16