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Net debt - Summary of Movement in Net Debt (Detail) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2025
Dec. 31, 2024
Dec. 31, 2023
Movement in net debt      
Net increase/(decrease) in cash and cash equivalents, net of overdrafts $ 94 $ (269) $ 339
Add back financing cash flows in respect of other components of net debt:      
Principal element of lease payments 30 46  
Issue of long-term bonds (990) (834)  
Repayment of long-term bonds 403 547  
Settlement of currency swaps 0 45  
Drawdown of Revolving Credit Facility (75) 0  
Repayment of Revolving Credit Facility 75 0  
Total financing cash flows in respect of other components of net debt (557) (196)  
Increase in net debt arising from cash flows (463) (465)  
Other movements:      
Lease liabilities (19) (36)  
Increase in accrued interest (2) (6)  
Exchange and other adjustments (67) (3)  
Total other movements (88) (45)  
Increase in net debt (551) (510)  
Net debt at beginning of the year (2,782) (2,272)  
Net debt at end of the year $ (3,333) $ (2,782) $ (2,272)