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Group assets and liabilities - Provisions (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Group assets and liabilities    
Balance at the beginning of the year $ 224 $ 206
Additional provisions 136 198
Unused amounts released (4) (10)
Utilisation during the year (133) (172)
Exchange differences (5) 2
Balance at the end of the year 218 224
Provisions for staff benefits $ 199 $ 215