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Schedule of employee benefits (Details) - USD ($)
$ in Millions
Jun. 30, 2022
Dec. 31, 2021
DisclosureEmployeeBenefitsLineItems [Line Items]    
Non-current $ 1,180 $ 1,289
Current net defined benefit liability 1,177 1,286
Non-current provisions for employee benefits 3 3
Employees variable compensation program [member]    
DisclosureEmployeeBenefitsLineItems [Line Items]    
Non-current 272 461
Accrued vacation pay [member]    
DisclosureEmployeeBenefitsLineItems [Line Items]    
Non-current 600 440
Salaries and related charges [member]    
DisclosureEmployeeBenefitsLineItems [Line Items]    
Non-current 244 270
Profit sharing [member]    
DisclosureEmployeeBenefitsLineItems [Line Items]    
Non-current $ 64 $ 118