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Risk management (Details) - Derivatives Not Designated For Hedge Accounting [Member] - USD ($)
$ in Millions
 6 Months Ended
Jun. 30, 2023
Dec. 31, 2022
IfrsStatementLineItems [Line Items]    
Fair Value Of Derivative Financial Assets (Liability) $ 27 $ (120)
Long Position Or Crude Oil And Oil Products One [Member]    
IfrsStatementLineItems [Line Items]    
Notional value [1] $ 10,380 9,058
Maturity 2023  
Short Position Or Crude Oil And Oil Products One [Member]    
IfrsStatementLineItems [Line Items]    
Notional value [1] $ (8,571) (8,375)
Maturity 2023  
Futures contract [member]    
IfrsStatementLineItems [Line Items]    
Notional value [1] $ 1,809 683
Fair Value Of Derivative Financial Assets (Liability) [1] (12) (40)
Swap contract [member] | Short Put Soybean Oil [Member]    
IfrsStatementLineItems [Line Items]    
Fair Value Of Derivative Financial Assets (Liability) [2] $ (2)  
Maturity 2023  
Notional value [2] $ (10) (3)
Swap contract [member] | I P C A [Member]    
IfrsStatementLineItems [Line Items]    
Fair Value Of Derivative Financial Assets (Liability) [3] $ 61 (16)
Maturity 2029/2034  
Swap contract [member] | Foreign Currency Or Cross Currency Swap Two [Member]    
IfrsStatementLineItems [Line Items]    
Fair Value Of Derivative Financial Assets (Liability) [3] $ (20) (64)
Maturity 2024/2029  
Forward contract [member] | Short Position Foreign Currency [Member]    
IfrsStatementLineItems [Line Items]    
Maturity 2023  
Notional value [3] $ (9)  
I P C A [Member] | Foreign Currency Or Cross Currency Swap One [Member]    
IfrsStatementLineItems [Line Items]    
Notional value [3] 3,008 3,008
Foreign Currency Or Cross Currency Swap Two [Member] | Foreign Currency Or Cross Currency Swap One [Member]    
IfrsStatementLineItems [Line Items]    
Notional value [3] $ 729 $ 729
[1] Notional value in thousands of bbl.
[2] Notional value in thousands of tons.
[3] Amounts in US$ and R$ are presented in million.