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Share-based payment - Summary of Options at Different Exercise Price (Detail) - shares
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Disclosure Of Terms And Conditions Of Share Based Payment Arrangement Options At Different Exercise Price [Line Items]        
Number of options 17,821,000 21,460,000 25,344,000 28,819,000
Exercise price 8.00 per share option [Member]        
Disclosure Of Terms And Conditions Of Share Based Payment Arrangement Options At Different Exercise Price [Line Items]        
Number of options 2,532,000      
Exercise price 50.00 per share option [Member]        
Disclosure Of Terms And Conditions Of Share Based Payment Arrangement Options At Different Exercise Price [Line Items]        
Number of options 4,562,000      
Exercise price 98.06 per share option [Member]        
Disclosure Of Terms And Conditions Of Share Based Payment Arrangement Options At Different Exercise Price [Line Items]        
Number of options 7,905,000      
Exercise price 118.00 per share option [Member]        
Disclosure Of Terms And Conditions Of Share Based Payment Arrangement Options At Different Exercise Price [Line Items]        
Number of options 2,822,000