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Risk management (Details 11) - USD ($)
$ in Millions
Jun. 30, 2023
Dec. 31, 2022
IfrsStatementLineItems [Line Items]    
Foreign currency derivatives   $ 61
Recurring fair value measurement [member]    
IfrsStatementLineItems [Line Items]    
Foreign currency derivatives $ (34) (121)
Recurring fair value measurement [member] | Interest Rate Derivatives [Member]    
IfrsStatementLineItems [Line Items]    
Foreign currency derivatives 61  
Recurring fair value measurement [member] | Foreign Currency Contracts Derivative [Member]    
IfrsStatementLineItems [Line Items]    
Foreign currency derivatives (20)  
Recurring fair value measurement [member] | Commodity Derivatives Liabilities [Member]    
IfrsStatementLineItems [Line Items]    
Foreign currency derivatives (14)  
Level 2 of fair value hierarchy [member] | Recurring fair value measurement [member]    
IfrsStatementLineItems [Line Items]    
Foreign currency derivatives 61  
Foreign currency derivatives (22) (81)
Level 2 of fair value hierarchy [member] | Recurring fair value measurement [member] | Interest Rate Derivatives [Member]    
IfrsStatementLineItems [Line Items]    
Foreign currency derivatives 61  
Level 2 of fair value hierarchy [member] | Recurring fair value measurement [member] | Foreign Currency Contracts Derivative [Member]    
IfrsStatementLineItems [Line Items]    
Foreign currency derivatives (20)  
Level 2 of fair value hierarchy [member] | Recurring fair value measurement [member] | Commodity Derivatives Liabilities [Member]    
IfrsStatementLineItems [Line Items]    
Foreign currency derivatives (2)  
Level 1 of fair value hierarchy [member] | Recurring fair value measurement [member] | Commodity Derivatives Liabilities [Member]    
IfrsStatementLineItems [Line Items]    
Foreign currency derivatives $ (12) $ (40)