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Income tax (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Current tax:      
Current tax for the year $ 17 $ 31 $ 32
Adjustment in respect of prior years (5) (28) 2
Total current tax 12 3 34
Deferred tax:      
Deferred tax for the year (2) (27) (14)
Adjustments in respect of prior years 3 3 (1)
Total deferred tax 1 (24) (15)
Income tax charge/(credit) $ 13 $ (21) $ 19