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Pensions and similar obligations - Summary of Employee Benefit Expense Recognized in Income Statement (Detail) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2025
Dec. 31, 2024
Dec. 31, 2023
Disclosure Of Employee Benefit Expenses [line items]      
Total employee benefit expense $ (139) $ (151) $ (150)
Cost of sales [member]      
Disclosure Of Employee Benefit Expenses [line items]      
Total employee benefit expense (20) (20) (18)
Distribution expenses [member]      
Disclosure Of Employee Benefit Expenses [line items]      
Total employee benefit expense (8) (10) (9)
Sales and marketing expenses [member]      
Disclosure Of Employee Benefit Expenses [line items]      
Total employee benefit expense (14) (14) (14)
Administrative expenses [member]      
Disclosure Of Employee Benefit Expenses [line items]      
Total employee benefit expense (23) (18) (21)
Net finance cost [member]      
Disclosure Of Employee Benefit Expenses [line items]      
Total employee benefit expense (74) (88) (88)
Defined Benefit Plan [Member]      
Disclosure Of Employee Benefit Expenses [line items]      
Current service costs (46) (51) (50)
Administration costs (16) (18) (17)
Past service cost due to plan amendments, curtailments or settlements (2) 6 6
(Losses)/gains due to experience and demographic assumption changes (1) (1) (1)
Profit from operations (65) (63) (61)
Net finance cost (74) (88) (88)
Total employee benefit expense $ (139) $ (151) $ (150)