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Employee costs (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Employee costs      
Wages and salaries $ 470 $ 425 $ 334
Social security costs 115 106 91
Defined benefit plan pension costs (note 21) 11 10 13
Defined contribution plan pension costs (note 21) 21 19 17
Group employee costs $ 617 $ 560 $ 455