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Financial and capital risk management - Financial counterparties' ratings (Details) - USD ($)
$ in Millions
Dec. 31, 2022
Dec. 31, 2021
Cash And Cash Equivalents Current [Member]    
IfrsStatementLineItems [Line Items]    
Credit exposure $ 4,797 $ 11,905
Cash And Cash Equivalents Current [Member] | Moody's, Aa1 Rating [Member]    
IfrsStatementLineItems [Line Items]    
Credit exposure 32 128
Cash And Cash Equivalents Current [Member] | Moody's, Aa2 Rating [Member]    
IfrsStatementLineItems [Line Items]    
Credit exposure 342 285
Cash And Cash Equivalents Current [Member] | Moody's, Aa3 Rating [Member]    
IfrsStatementLineItems [Line Items]    
Credit exposure 239 495
Cash And Cash Equivalents Current [Member] | Moody's, A1 Rating [Member]    
IfrsStatementLineItems [Line Items]    
Credit exposure 1,746 1,145
Cash And Cash Equivalents Current [Member] | Moody's, A2 Rating [Member]    
IfrsStatementLineItems [Line Items]    
Credit exposure 938 3,478
Cash And Cash Equivalents Current [Member] | Moody's, A3 Rating [Member]    
IfrsStatementLineItems [Line Items]    
Credit exposure 918 1,518
Cash And Cash Equivalents Current [Member] | Moody's, Baa1 Rating [Member]    
IfrsStatementLineItems [Line Items]    
Credit exposure   90
Cash And Cash Equivalents Current [Member] | Moody's, Baa2 Rating [Member]    
IfrsStatementLineItems [Line Items]    
Credit exposure 7 10
Cash And Cash Equivalents Current [Member] | Moody's, Ba2 Rating [Member]    
IfrsStatementLineItems [Line Items]    
Credit exposure [1] 411 2,763
Cash And Cash Equivalents Current [Member] | Moody's, Ba3 Rating [Member]    
IfrsStatementLineItems [Line Items]    
Credit exposure [1] 164 1,988
Cash And Cash Equivalents Current [Member] | Moody S Other Rating [Member]    
IfrsStatementLineItems [Line Items]    
Credit exposure   5
Derivatives [member]    
IfrsStatementLineItems [Line Items]    
Credit exposure 538 131
Derivatives [member] | Moody's, Aa2 Rating [Member]    
IfrsStatementLineItems [Line Items]    
Credit exposure 5 15
Derivatives [member] | Moody's, Aa3 Rating [Member]    
IfrsStatementLineItems [Line Items]    
Credit exposure   34
Derivatives [member] | Moody's, A1 Rating [Member]    
IfrsStatementLineItems [Line Items]    
Credit exposure 98 3
Derivatives [member] | Moody's, A2 Rating [Member]    
IfrsStatementLineItems [Line Items]    
Credit exposure 146 39
Derivatives [member] | Moody's, A3 Rating [Member]    
IfrsStatementLineItems [Line Items]    
Credit exposure 63 20
Derivatives [member] | Moody's, Ba2 Rating [Member]    
IfrsStatementLineItems [Line Items]    
Credit exposure [1] 176 5
Derivatives [member] | Moody's, Ba3 Rating [Member]    
IfrsStatementLineItems [Line Items]    
Credit exposure [1] 55  
Derivatives [member] | Moody S Other Rating [Member]    
IfrsStatementLineItems [Line Items]    
Credit exposure $ (5) $ 15
[1] A substantial part of the balances is held with financial institutions in Brazil and, in local currency, they are deemed investment grade.