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Employee Benefits - Summary of Employee Benefit Expense Recognized in Income Statement (Detail) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Disclosure Of Employee Benefit Expenses [line items]      
Total employee benefit expense $ (176) $ (156) $ (137)
Cost of sales [member]      
Disclosure Of Employee Benefit Expenses [line items]      
Total employee benefit expense (30) (28) (17)
Distribution expenses [member]      
Disclosure Of Employee Benefit Expenses [line items]      
Total employee benefit expense (11) (9) (5)
Sales and marketing expenses [member]      
Disclosure Of Employee Benefit Expenses [line items]      
Total employee benefit expense (24) (18) (4)
Administrative expenses [member]      
Disclosure Of Employee Benefit Expenses [line items]      
Total employee benefit expense (34) (20) (3)
Other Operating (Expense)/Income [Member]      
Disclosure Of Employee Benefit Expenses [line items]      
Total employee benefit expense (1) (1) 0
Exceptional items [member]      
Disclosure Of Employee Benefit Expenses [line items]      
Total employee benefit expense   (7)  
Net Finance Cost [Member]      
Disclosure Of Employee Benefit Expenses [line items]      
Total employee benefit expense (76) (87) (114)
Defined Benefit Plan [Member]      
Disclosure Of Employee Benefit Expenses [line items]      
Current service costs (80) (72) (67)
Administration costs (19) (19) (23)
Past service cost due to plan amendments, curtailments or settlements (2) 16 66
(Losses)/gains due to experience and demographic assumption changes 1 6 1
Profit from operations (100) (69) (23)
Net finance cost (76) (87) (114)
Total employee benefit expense $ (176) $ (156) $ (137)