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Classification and measurement of financial instruments - Summary of Reconciliation of Movements in the Fair Values of Financial Instruments Classified as Level 3 (Detail) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2025
Dec. 31, 2024
Other financial assets    
At 1 January $ 4,748  
At 31 December 5,345 $ 4,748
Contingent purchase consideration    
At 1 January (7,056)  
At 31 December (8,081) (7,056)
Other financial assets    
Other financial assets    
At 1 January 126 110
Additions   20
Unrealised changes in fair value (1) 0
Exchange and other adjustments   (4)
At 31 December 125 126
Contingent purchase consideration    
Contingent purchase consideration    
At 1 January (73) (69)
Additions   0
Unrealised changes in fair value (6) (4)
Exchange and other adjustments   0
At 31 December $ (79) $ (73)