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Employee benefits (Details) - USD ($)
$ in Millions
Dec. 31, 2023
Dec. 31, 2022
IfrsStatementLineItems [Line Items]    
Current liabilities $ 964 $ 930
Non-current liabilities 1,381 1,260
Payroll Related Charges And Other Remunerations [Member]    
IfrsStatementLineItems [Line Items]    
Current liabilities 867 831
Share Based Payment [Member]    
IfrsStatementLineItems [Line Items]    
Current liabilities 27 33
Employee Postretirement Obligation Provision [Member]    
IfrsStatementLineItems [Line Items]    
Current liabilities 70 66
Non-current liabilities $ 1,381 $ 1,260