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Employee benefit obligations - Movement in the defined benefit obligations (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]      
Beginning of year $ (105)    
Re-measurements (14) $ 10 $ (145)
End of year (104) (105)  
Obligations      
Disclosure of net defined benefit liability (asset) [line items]      
Beginning of year (324) (287)  
Acquired   (1)  
Current service cost (6) (7)  
Exceptional past service charge   (3)  
Interest cost (13) (13)  
Re-measurements 14 (10)  
Employee contributions (1) (1)  
Benefits paid 16 10  
Exchange 9 (12)  
End of year (305) (324) (287)
Assets      
Disclosure of net defined benefit liability (asset) [line items]      
Beginning of year 219 202  
Transfers   1  
Interest Income 10 10  
Administration expenses paid   (1)  
Re-measurements (21) (5)  
Employer contributions 11 10  
Employee contributions 1 1  
Benefits paid (16) (10)  
Exchange (3) 11  
End of year $ 201 $ 219 $ 202