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Significant Events - U.S. Solar and Wind Acquisition (Details)
CAD in Millions
 12 Months Ended
Oct. 01, 2015
CAD
MW
Sep. 01, 2015
CAD
MW
Dec. 31, 2016
Dec. 31, 2015
CAD
U.S. Solar and Wind        
Assets        
Property, plant, and equipment CAD 217      
Inventory (SREC-I) 10      
Net working capital 6      
Total assets acquired 233      
Liabilities        
Non-recourse debt 55      
Tax equity liability 50      
Deferred tax liabilities 18      
Decomissioning and restoration provision 4      
Total liabilities assumed 127      
Total consideration transferred CAD 106      
Increase (decrease) in revenues       CAD 14
Increase (decrease) in earnings, before tax       CAD (6)
Odin Power        
Disclosure of detailed information about business combination [line items]        
Ownership interest (as a percent) 10000.00%      
Capacity of facility (in megawatts) | MW 50      
Liabilities        
Total consideration transferred CAD 49      
RC Solar        
Disclosure of detailed information about business combination [line items]        
Ownership interest (as a percent)   10000.00%    
Capacity of facility (in megawatts) | MW   21    
Liabilities        
Total consideration transferred   CAD 55    
RC Solar | Minimum        
Disclosure of detailed information about business combination [line items]        
Term of power purchase arrangement     20 years  
RC Solar | Maximum        
Disclosure of detailed information about business combination [line items]        
Term of power purchase arrangement     30 years