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Share-based Payment - Summary of Employee Share Options (Detail)
 12 Months Ended
Dec. 31, 2021
shares
$ / shares
Dec. 31, 2020
shares
$ / shares
Dec. 31, 2019
shares
$ / shares
Disclosure of terms and conditions of share-based payment arrangement [line items]      
Outstanding, beginning of year | $ / shares $ 74.22 $ 74.99 $ 74.86
Forfeited | $ / shares 91.64 79.23 73.92
Exercised during the year | $ / shares 41.43    
Outstanding, end of year | $ / shares $ 76.12 $ 74.22 $ 74.99
Outstanding, beginning of year 21,460,000 25,344,000 28,819,000
Granted 0 0  
Forfeited (1,702,000) (3,884,000) (3,475,000)
Exercised during the year (1,937,000)    
Outstanding, end of year 17,821,000 21,460,000 25,344,000
Performance Share Units      
Disclosure of terms and conditions of share-based payment arrangement [line items]      
Outstanding, beginning of year | $ / shares $ 140.87 $ 0  
Granted | $ / shares 82.60 140.88  
Forfeited | $ / shares 152.70 141.31  
Exercised during the year | $ / shares 141.69    
Outstanding, end of year | $ / shares $ 109.47 $ 140.87 $ 0
Outstanding, beginning of year 1,958,000 0  
Granted 1,590,000 1,990,000  
Forfeited (223,000) (32,000)  
Exercised during the year (283,000)    
Outstanding, end of year 3,042,000 1,958,000 0