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Acquisitions, Investments and Dispositions - Texas Solar 7 (Details) - Texas Solar 7
$ in Millions
1 Months Ended 12 Months Ended
Jan. 31, 2016
USD ($)
MW
Dec. 31, 2016
USD ($)
Dec. 31, 2017
USD ($)
Business Acquisition [Line Items]      
Generating capacity (MW AC) | MW 106    
Con Edison Development      
Business Acquisition [Line Items]      
Percentage of voting interest acquired 100.00%    
Payments to acquire business $ 227    
Non-utility construction work in progress 218    
Receivable from parent company $ 9    
Net assets   $ 127 $ 137
Intangible assets   $ 41