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Schedule of estimated expected benefits payments (Details)
$ in Millions
 12 Months Ended
Dec. 31, 2021
USD ($)
Not later than one year [member]  
IfrsStatementLineItems [Line Items]  
Estimated expected benefits payment $ 5
Later than one year and not later than two years [member]  
IfrsStatementLineItems [Line Items]  
Estimated expected benefits payment 3
Later than two years and not later than three years [member]  
IfrsStatementLineItems [Line Items]  
Estimated expected benefits payment 3
Later than three years and not later than four years [member]  
IfrsStatementLineItems [Line Items]  
Estimated expected benefits payment 3
Later than four years and not later than five years [member]  
IfrsStatementLineItems [Line Items]  
Estimated expected benefits payment 3
Later Than Six Years And Not Later Than Ten Years [Member]  
IfrsStatementLineItems [Line Items]  
Estimated expected benefits payment $ 12