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Employee benefit obligations - Defined benefit pension schemes (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Disclosure of net defined benefit liability (asset) [line items]      
Service and administration costs $ (11) $ (10) $ (13)
Finance expense (5) (5) (3)
Total defined benefit pension costs including exceptional past service charges. (16) (19) (16)
Cost of sales      
Disclosure of net defined benefit liability (asset) [line items]      
Current service cost (8) (8) (11)
Exceptional past service charge   (4)  
SGA      
Disclosure of net defined benefit liability (asset) [line items]      
Current service cost $ (3) $ (2) $ (2)