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Schedule of provisions (Details) - USD ($)
$ in Millions
Dec. 31, 2021
Dec. 31, 2020
IfrsStatementLineItems [Line Items]    
Provisions, non current $ 141 $ 111
Provisions, current 5 16
Provisions For Contingencies [Member]    
IfrsStatementLineItems [Line Items]    
Provisions, non current 106 91
Provisions, current 12
Asset Retirement Obligation [Member]    
IfrsStatementLineItems [Line Items]    
Provisions, non current 19 19
Provisions, current 2 2
Environmental Remediations [Member]    
IfrsStatementLineItems [Line Items]    
Provisions, non current 15 1
Provisions, current 3 2
Other provisions [member]    
IfrsStatementLineItems [Line Items]    
Provisions, non current $ 1