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Employee benefits (Details) - USD ($)
$ in Millions
Jun. 30, 2024
Dec. 31, 2023
IfrsStatementLineItems [Line Items]    
Current liabilities $ 724 $ 964
Non-current liabilities 1,221 1,381
Payroll Related Charges And Other Remunerations [Member]    
IfrsStatementLineItems [Line Items]    
Current liabilities 636 867
Share Based Payment [Member]    
IfrsStatementLineItems [Line Items]    
Current liabilities 18 27
Employee Postretirement Obligation Provision [Member]    
IfrsStatementLineItems [Line Items]    
Current liabilities 70 70
Non-current liabilities $ 1,221 $ 1,381