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Selling expenses (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
IfrsStatementLineItems [Line Items]      
Total selling expenses $ 33 $ 26 $ 28
Salaries And Social Security Charges [Member]      
IfrsStatementLineItems [Line Items]      
Total selling expenses 3 3 5
Benefits To Employees [Member]      
IfrsStatementLineItems [Line Items]      
Total selling expenses 1
Fees And Compensation For Services [Member]      
IfrsStatementLineItems [Line Items]      
Total selling expenses 3 3 2
Compensation Agreements [Member]      
IfrsStatementLineItems [Line Items]      
Total selling expenses 1 (1)
Taxes Rates And Contributions [Member]      
IfrsStatementLineItems [Line Items]      
Total selling expenses 11 8 10
Transport [Member]      
IfrsStatementLineItems [Line Items]      
Total selling expenses 14 9 9
Other [Member]      
IfrsStatementLineItems [Line Items]      
Total selling expenses $ 2 $ 2 $ 2