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Employee Benefits - Summary of Employee Benefit Expense Recognized in Income Statement (Detail) - USD ($) $ in Millions | 12 Months Ended
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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)

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