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Right of Use Assets - Narrative (Details) - CAD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2019
Jan. 01, 2019
Dec. 31, 2018
Disclosure of quantitative information about right-of-use assets [line items]      
Right-of-use assets $ 146   $ 0
Lease liabilities   $ 52  
Payments of lease liabilities, classified as financing activities 25    
Interest expense on lease liabilities 4    
Lease commitments for short-term leases for which recognition exemption has been used 2    
Expense relating to variable lease payments not included in measurement of lease liabilities 6    
IFRS 16      
Disclosure of quantitative information about right-of-use assets [line items]      
Right-of-use assets 146 $ 85 $ 52
IFRS 16 | Wind Farms      
Disclosure of quantitative information about right-of-use assets [line items]      
Right-of-use assets 31    
Lease liabilities $ 31