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Net Debt - Summary of Movement in Net Debt (Detail) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Movement in net debt      
Net increase/(decrease) in cash and cash equivalents, net of overdrafts $ (269) $ 339 $ (393)
Add back financing cash flows in respect of other components of net debt:      
Principal element of lease payments 46 28  
Issue of long-term bonds (834) (657)  
Repayment of long-term bonds 547 0 209
Settlement of currency swaps 45 0  
Total financing cash flows in respect of other components of net debt (196) (629)  
Increase in net debt arising from cash flows (465) (290)  
Other movements:      
Lease liabilities (36) (25)  
Increase in accrued interest (6) (2)  
Exchange and other adjustments (3) (104)  
Total other movements (45) (131)  
(Increase)/decrease in net debt (510) (421)  
Net debt at beginning of the year (2,272) (1,851)  
Net debt at end of the year $ (2,782) $ (2,272) $ (1,851)