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Pension and similar obligations - Summary of Employee Benefit Expense Recognized in Income Statement (Detail) - USD ($)
$ in Millions
 12 Months Ended
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)