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Risk management (Details 5) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
IfrsStatementLineItems [Line Items]      
Foreign exchange variation [1] $ 1,022 $ (2,737) $ (1,363)
Non Derivative Financial Instruments [Member]      
IfrsStatementLineItems [Line Items]      
Ending balance 62,119 72,640  
Additional hedging relationships designated, designations revoked and hedging instruments re-designated 14,589    
Exports affecting the statement of income (12,037)    
Principal repayments / amortization (13,073)    
Nominal value of hedging instrument (finance debt and lease liability) at December 31, 2020 72,393    
Non Derivative Financial Instruments [Member] | Brazil, Brazil Real      
IfrsStatementLineItems [Line Items]      
Ending balance 324,121 $ 405,370  
Additional hedging relationships designated, designations revoked and hedging instruments re-designated 76,263    
Exports affecting the statement of income (62,172)    
Principal repayments / amortization (67,270)    
Foreign exchange variation (28,070)    
Nominal value of hedging instrument (finance debt and lease liability) at December 31, 2020 $ 377,723    
[1] For more information, see notes 34.3a and 34.3c.