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Administrative expenses (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
IfrsStatementLineItems [Line Items]      
Total administrative expenses $ 99 $ 93 $ 105
Salaries And Social Security Charges [Member]      
IfrsStatementLineItems [Line Items]      
Total administrative expenses 34 34 38
Benefits To The Personnel [Member]      
IfrsStatementLineItems [Line Items]      
Total administrative expenses 5 4 8
Accrual Of Defined Benefit Plans [Member]      
IfrsStatementLineItems [Line Items]      
Total administrative expenses 7 7 7
Fees And Compensation For Services [Member]      
IfrsStatementLineItems [Line Items]      
Total administrative expenses 32 26 29
Compensation Agreements [Member]      
IfrsStatementLineItems [Line Items]      
Total administrative expenses 2
Directors And Syndicates Fees [Member]      
IfrsStatementLineItems [Line Items]      
Total administrative expenses 6 7 9
Property Plant And Equipment Depreciations [Member]      
IfrsStatementLineItems [Line Items]      
Total administrative expenses 5 5 7
Consumption Of Materials [Member]      
IfrsStatementLineItems [Line Items]      
Total administrative expenses 1
Maintenance One [Member]      
IfrsStatementLineItems [Line Items]      
Total administrative expenses 2 1 1
Transport And Per Diem [Member]      
IfrsStatementLineItems [Line Items]      
Total administrative expenses 1 1 1
Rental And Insurance [Member]      
IfrsStatementLineItems [Line Items]      
Total administrative expenses 1 1 1
Surveillance And Security [Member]      
IfrsStatementLineItems [Line Items]      
Total administrative expenses 1
Taxes Rates And Contributions [Member]      
IfrsStatementLineItems [Line Items]      
Total administrative expenses 2 2 1
Communications [Member]      
IfrsStatementLineItems [Line Items]      
Total administrative expenses 1 1 2
Other [Member]      
IfrsStatementLineItems [Line Items]      
Total administrative expenses $ 1 $ 3