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Pension and similar obligations - Summary of Employee Benefit Expense Recognized in Income Statement (Detail) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
Disclosure Of Employee Benefit Expenses [line items] |  |  |
Total employee benefit expense | $ (150) | $ (154) | $ (176)
Cost of sales [member] |  |  |
Disclosure Of Employee Benefit Expenses [line items] |  |  |
Total employee benefit expense | (18) | (25) | (30)
Distribution expenses [member] |  |  |
Disclosure Of Employee Benefit Expenses [line items] |  |  |
Total employee benefit expense | (9) | (11) | (11)
Sales and marketing expenses [member] |  |  |
Disclosure Of Employee Benefit Expenses [line items] |  |  |
Total employee benefit expense | (14) | (17) | (24)
Administrative expenses [member] |  |  |
Disclosure Of Employee Benefit Expenses [line items] |  |  |
Total employee benefit expense | (21) | (28) | (34)
Other operating (expense)/income [member] |  |  |
Disclosure Of Employee Benefit Expenses [line items] |  |  |
Total employee benefit expense | 0 | 0 | (1)
Net finance cost [member] |  |  |
Disclosure Of Employee Benefit Expenses [line items] |  |  |
Total employee benefit expense | (88) | (73) | (76)
Defined Benefit Plan [Member] |  |  |
Disclosure Of Employee Benefit Expenses [line items] |  |  |
Current service costs | (50) | (66) | (80)
Administration costs | (17) | (17) | (19)
Past service cost due to plan amendments, curtailments or settlements | 6 | 2 | (2)
(Losses)/gains due to experience and demographic assumption changes | (1) | 0 | 1
Profit from operations | (61) | (81) | (100)
Net finance cost | (88) | (73) | (76)
Total employee benefit expense | $ (150) | $ (154) | $ (176)

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