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Share-based payments - Stock Options Exercise Prices and Weighted Average Remaining Life (Details)
Dec. 31, 2020
year
shares
$ / shares
Dec. 31, 2019
shares
year
$ / shares
Dec. 31, 2018
shares
$ / shares
Disclosure of number and weighted average remaining contractual life of outstanding share options [line items]      
NUMBER (in shares) | shares 15,650,234 12,825,541 14,072,332
WEIGHTED AVERAGE REMAINING LIFE (YEARS) | year 7 5  
WEIGHTED AVERAGE EXERCISE PRICE ($) $ 59 $ 57 $ 56
$40-$49      
Disclosure of number and weighted average remaining contractual life of outstanding share options [line items]      
NUMBER (in shares) | shares 187,744 449,216  
WEIGHTED AVERAGE REMAINING LIFE (YEARS) | year 0 1  
WEIGHTED AVERAGE EXERCISE PRICE ($) $ 48 $ 47  
$40-$49 | Bottom of range      
Disclosure of range of exercise prices of outstanding share options [line items]      
Exercise price of outstanding share options 40    
$40-$49 | Top of range      
Disclosure of range of exercise prices of outstanding share options [line items]      
Exercise price of outstanding share options $ 49    
$50-$59      
Disclosure of number and weighted average remaining contractual life of outstanding share options [line items]      
NUMBER (in shares) | shares 11,998,200 12,271,003  
WEIGHTED AVERAGE REMAINING LIFE (YEARS) | year 5 6  
WEIGHTED AVERAGE EXERCISE PRICE ($) $ 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 50    
$50-$59 | Top of range      
Disclosure of range of exercise prices of outstanding share options [line items]      
Exercise price of outstanding share options $ 59    
$60 & above      
Disclosure of number and weighted average remaining contractual life of outstanding share options [line items]      
NUMBER (in shares) | shares 3,464,290 105,322  
WEIGHTED AVERAGE REMAINING LIFE (YEARS) | year 9 4  
WEIGHTED AVERAGE EXERCISE PRICE ($) $ 65 $ 61  
$60 & above | Bottom of range      
Disclosure of range of exercise prices of outstanding share options [line items]      
Exercise price of outstanding share options $ 60