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Share-based Payment Expense - Summary of Share-based Payment Expense, Continuing Operations (Detail) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Disclosure Of Share Based Compensation Expense [line items]      
Share-based payment expense [1] $ 110 $ 96 $ 83
Performance Share Plans and Restricted Share Plan expense [member]      
Disclosure Of Share Based Compensation Expense [line items]      
Share-based payment expense 108 93 79
Share option expense [member]      
Disclosure Of Share Based Compensation Expense [line items]      
Share-based payment expense $ 2 $ 3 $ 4
[1] The total share-based payment expense in 2019, including discontinued operations, amounted to $86 million.