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Schedule of salaries and social security payable (Details) - USD ($)
$ in Millions
Dec. 31, 2021
Dec. 31, 2020
IfrsStatementLineItems [Line Items]    
Current salaries and social security payable $ 28 $ 23
Salaries And Social Security Contributions [Member]    
IfrsStatementLineItems [Line Items]    
Current salaries and social security payable 4 3
Provision For Vacations [Member]    
IfrsStatementLineItems [Line Items]    
Current salaries and social security payable 7 7
Provision For Gratifications And Annual Bonus For Efficiency [Member]    
IfrsStatementLineItems [Line Items]    
Current salaries and social security payable $ 17 $ 13