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Risk management (Details 5) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2023
Jun. 30, 2022
Jun. 30, 2023
Jun. 30, 2022
Dec. 31, 2020
IfrsStatementLineItems [Line Items]          
Foreign exchange gain (loss) [1] $ 1,523 $ (1,640) $ 2,320 $ 781  
B R L [Member]          
IfrsStatementLineItems [Line Items]          
Nominal value of hedging instrument (finance debt and lease liability) at June 30, 2022 382,618   382,618    
Hedging instruments [member]          
IfrsStatementLineItems [Line Items]          
Ending balance         $ 65,472
Non Derivative Financial Instruments [Member]          
IfrsStatementLineItems [Line Items]          
Beginning balance     62,119    
Additional hedging relationships designated, designations revoked and hedging instruments re-designated     15,874    
Exports affecting the statement of income     (3,547)    
Principal repayments / amortization     (8,974)    
Ending balance 65,472   65,472    
Nominal value of hedging instrument (finance debt and lease liability) at June 30, 2022 79,394   79,394    
Non Derivative Financial Instruments [Member] | B R L [Member]          
IfrsStatementLineItems [Line Items]          
Ending balance   $ 315,523   $ 315,523  
Beginning balance     324,121    
Additional hedging relationships designated, designations revoked and hedging instruments re-designated     80,388    
Exports affecting the statement of income     (18,145)    
Principal repayments / amortization     (45,515)    
Foreign exchange gain (loss)     (25,326)    
Ending balance $ 315,523   $ 315,523    
[1] For more information, see notes 27.3a and 27.3c.