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Share-based payments - Stock Options Exercise Prices and Weighted Average Remaining Life (Details)
Dec. 31, 2022
year
shares
$ / shares
Dec. 31, 2021
year
shares
$ / shares
Dec. 31, 2020
shares
$ / shares
Disclosure of number and weighted average remaining contractual life of outstanding share options [line items]      
NUMBER (in shares) | shares 7,802,108 10,778,724 15,650,234
WEIGHTED AVERAGE REMAINING LIFE (YEARS) | year 5 6  
Weighted average exercise price of share options outstanding (in cad per share) $ 61 $ 60 $ 59
$50-$59      
Disclosure of number and weighted average remaining contractual life of outstanding share options [line items]      
NUMBER (in shares) | shares 4,510,298 7,442,442  
WEIGHTED AVERAGE REMAINING LIFE (YEARS) | year 4 4  
Weighted average exercise price of share options outstanding (in cad per share) $ 58 $ 58  
$50-$59 | Bottom of range      
Disclosure of range of exercise prices of outstanding share options [line items]      
Exercise price of outstanding share options (in cad per share) 50    
$50-$59 | Top of range      
Disclosure of range of exercise prices of outstanding share options [line items]      
Exercise price of outstanding share options (in cad per share) $ 59    
$60 & above      
Disclosure of number and weighted average remaining contractual life of outstanding share options [line items]      
NUMBER (in shares) | shares 3,291,810 3,336,282  
WEIGHTED AVERAGE REMAINING LIFE (YEARS) | year 7 8  
Weighted average exercise price of share options outstanding (in cad per share) $ 65 $ 65  
$60 & above | Bottom of range      
Disclosure of range of exercise prices of outstanding share options [line items]      
Exercise price of outstanding share options (in cad per share) $ 60