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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, 2024
Dec. 31, 2023
Dec. 31, 2022
Disclosure Of Employee Benefit Expenses [line items]      
Total employee benefit expense $ (150) $ (150) $ (154)
Cost of sales [member]      
Disclosure Of Employee Benefit Expenses [line items]      
Total employee benefit expense (20) (18) (25)
Distribution expenses [member]      
Disclosure Of Employee Benefit Expenses [line items]      
Total employee benefit expense (10) (9) (11)
Sales and marketing expenses [member]      
Disclosure Of Employee Benefit Expenses [line items]      
Total employee benefit expense (14) (14) (17)
Administrative expenses [member]      
Disclosure Of Employee Benefit Expenses [line items]      
Total employee benefit expense (18) (21) (28)
Net finance cost [member]      
Disclosure Of Employee Benefit Expenses [line items]      
Total employee benefit expense (88) (88) (73)
Defined Benefit Plan [Member]      
Disclosure Of Employee Benefit Expenses [line items]      
Current service costs (51) (50) (66)
Administration costs (18) (17) (17)
Past service cost due to plan amendments, curtailments or settlements 6 6 2
(Losses)/gains due to experience and demographic assumption changes (1) (1) 0
Profit from operations (63) (61) (81)
Net finance cost (88) (88) (73)
Total employee benefit expense $ (150) $ (150) $ (154)