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Risk management (Details 7) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
IfrsStatementLineItems [Line Items]      
Foreign exchange variation $ 2,268 $ 1,022 $ (2,737)
Non Derivative Financial Instruments [Member]      
IfrsStatementLineItems [Line Items]      
Amounts designated 65,138 62,119  
Additional hedging relationships designated, designations revoked and hedging instruments re-designated 28,945    
Exports affecting the statement of income (9,380)    
Principal repayments / amortization (16,546)    
Nominal value of hedging instrument (finance debt and lease liability) 84,028    
Non Derivative Financial Instruments [Member] | Brazil, Brazil Real      
IfrsStatementLineItems [Line Items]      
Amounts designated 315,350 $ 324,121  
Additional hedging relationships designated, designations revoked and hedging instruments re-designated 144,095    
Exports affecting the statement of income (46,894)    
Principal repayments / amortization (82,733)    
Foreign exchange variation (23,239)    
Nominal value of hedging instrument (finance debt and lease liability) $ 406,807