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Financial and capital risk management - Financial counterparties' ratings (Details 12) - USD ($)
$ in Millions
Jun. 30, 2023
Dec. 31, 2022
Cash And Cash Equivalents Current [Member]    
IfrsStatementLineItems [Line Items]    
Credit exposure $ 5,029 $ 4,797
Cash And Cash Equivalents Current [Member] | Moody Aa 1 Rating [Member]    
IfrsStatementLineItems [Line Items]    
Credit exposure 36 32
Cash And Cash Equivalents Current [Member] | Moody Aa 2 Rating [Member]    
IfrsStatementLineItems [Line Items]    
Credit exposure 726 342
Cash And Cash Equivalents Current [Member] | Moody Aa 3 Rating [Member]    
IfrsStatementLineItems [Line Items]    
Credit exposure 190 239
Cash And Cash Equivalents Current [Member] | Moody A 1 Rating [Member]    
IfrsStatementLineItems [Line Items]    
Credit exposure 1,602 1,746
Cash And Cash Equivalents Current [Member] | Moody A 2 Rating [Member]    
IfrsStatementLineItems [Line Items]    
Credit exposure 736 938
Cash And Cash Equivalents Current [Member] | Moody A 3 Rating [Member]    
IfrsStatementLineItems [Line Items]    
Credit exposure 713 918
Cash And Cash Equivalents Current [Member] | Moody Baa 2 Rating [Member]    
IfrsStatementLineItems [Line Items]    
Credit exposure 51 7
Cash And Cash Equivalents Current [Member] | Moody Ba 2 Rating [Member]    
IfrsStatementLineItems [Line Items]    
Credit exposure [1] 798 411
Cash And Cash Equivalents Current [Member] | Moody Ba 3 Rating [Member]    
IfrsStatementLineItems [Line Items]    
Credit exposure [1] 177 164
Derivatives [member]    
IfrsStatementLineItems [Line Items]    
Credit exposure 1,081 538
Derivatives [member] | Moody Aa 2 Rating [Member]    
IfrsStatementLineItems [Line Items]    
Credit exposure   5
Derivatives [member] | Moody A 1 Rating [Member]    
IfrsStatementLineItems [Line Items]    
Credit exposure 139 97
Derivatives [member] | Moody A 2 Rating [Member]    
IfrsStatementLineItems [Line Items]    
Credit exposure 296 145
Derivatives [member] | Moody A 3 Rating [Member]    
IfrsStatementLineItems [Line Items]    
Credit exposure 52 62
Derivatives [member] | Moody Ba 2 Rating [Member]    
IfrsStatementLineItems [Line Items]    
Credit exposure [1] 426 174
Derivatives [member] | Moody Ba 3 Rating [Member]    
IfrsStatementLineItems [Line Items]    
Credit exposure [1] $ 168 $ 54
[1] A substantial part of the balances is held with financial institutions in Brazil and, in local currency, they are deemed investment grade.