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Schedule of sensitivity analyses on actuarial assumptions variations (Details)
$ in Millions
 12 Months Ended
Dec. 31, 2021
USD ($)
Discount Rate Four Percent [Member]  
IfrsStatementLineItems [Line Items]  
Obligation $ 36
Variation $ 3
Percentage of variation 10.00%
Discount Rate Six Percent [Member]  
IfrsStatementLineItems [Line Items]  
Obligation $ 31
Variation $ (2)
Percentage of variation 8.00%
Salaries Increase Zero Percent [Member]  
IfrsStatementLineItems [Line Items]  
Obligation $ 32
Variation $ (1)
Percentage of variation 3.00%
Salaries Increase Two Percent [Member]  
IfrsStatementLineItems [Line Items]  
Variation $ 1
Obligation $ 34
Percentage of variation 4.00%