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Financial and capital risk management (Details 1) - Not Designated As Hedging Instruments [Member] - USD ($)
$ in Millions
Jun. 30, 2024
Dec. 31, 2023
IfrsStatementLineItems [Line Items]    
Derivative Financial Assets Liabilities $ 37 $ 684
Foreign Exchange And Interest Rate Risk [Member]    
IfrsStatementLineItems [Line Items]    
Derivative Financial Assets Liabilities 26 664
Commodity price risk [member]    
IfrsStatementLineItems [Line Items]    
Derivative Financial Assets Liabilities 12 22
CDI & TJLP vs. US$ Fixed and Floating Rate Swap [Member] | Foreign Exchange And Interest Rate Risk [Member]    
IfrsStatementLineItems [Line Items]    
Derivative Financial Assets Liabilities (57) 79
Ipca Swap [Member] | Foreign Exchange And Interest Rate Risk [Member]    
IfrsStatementLineItems [Line Items]    
Derivative Financial Assets Liabilities (57) (41)
Dollar Swap [Member] | Foreign Exchange And Interest Rate Risk [Member]    
IfrsStatementLineItems [Line Items]    
Derivative Financial Assets Liabilities 130 650
SOFR Swap [Member] | Foreign Exchange And Interest Rate Risk [Member]    
IfrsStatementLineItems [Line Items]    
Derivative Financial Assets Liabilities 16 (24)
Treasury Forwards [Member] | Foreign Exchange And Interest Rate Risk [Member]    
IfrsStatementLineItems [Line Items]    
Derivative Financial Assets Liabilities (6)
Bunker Oil Gasoil And Brent [Member] | Commodity price risk [member]    
IfrsStatementLineItems [Line Items]    
Derivative Financial Assets Liabilities 16 30
Energy Transition Materials [Member] | Commodity price risk [member]    
IfrsStatementLineItems [Line Items]    
Derivative Financial Assets Liabilities (4) (8)
Other Options [Member] | Commodity price risk [member]    
IfrsStatementLineItems [Line Items]    
Derivative Financial Assets Liabilities $ (1) $ (2)