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employee future benefits - Other defined benefit plans (Details) - Other defined benefit plans - CAD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
employee future benefits    
Other defined benefits $ 3 $ 2
Financing cost 0 0
Other re-measurements recorded in other comprehensive income 0 $ 4
First year    
employee future benefits    
Estimated future benefit payments 1  
2 years hence    
employee future benefits    
Estimated future benefit payments 1  
3 years hence    
employee future benefits    
Estimated future benefit payments 1  
4 years hence    
employee future benefits    
Estimated future benefit payments 1  
5 years hence    
employee future benefits    
Estimated future benefit payments 1  
5 years hence to 10 years    
employee future benefits    
Estimated future benefit payments $ 5