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Employee benefits (Details 3) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Employee Benefits    
Opening Balance $ 192 $ 349
Effects in the statement of income (10) 16
Enrollments 6 18
Revision of provisions (16) (2)
Effects in cash and cash equivalents (53) (199)
Settlements in the period (53) (199)
Translation adjustment 14 26
Closing Balance 143 192
Current 81 75
Non-current $ 62 $ 117