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Financial risk management (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
IfrsStatementLineItems [Line Items]      
Gains/ (losses) recognized in the statement of income $ (8,340) $ 5,487 $ 6,662
Fair value hedges [member]      
IfrsStatementLineItems [Line Items]      
Gains/ (losses) recognized in the statement of income (3,124) (3,646) (5,258)
Recognized In Net Finance Income Expense [Member]      
IfrsStatementLineItems [Line Items]      
Gains/ (losses) recognized in the statement of income (3,166) (3,657) (5,002)
Cross-currency Swap CDI x Dollar [Member] | Exchange Rate Risk [Member] | Fair value hedges [member]      
IfrsStatementLineItems [Line Items]      
Gains/ (losses) recognized in the statement of income (96) 81 211
Cash Flow Hedge On Exports [Member] | Exchange Rate Risk [Member] | Fair value hedges [member]      
IfrsStatementLineItems [Line Items]      
Gains/ (losses) recognized in the statement of income (2,992) (3,763) (4,871)
Swap Pounds Sterlings X Dollar [Member] | Interest rate risk [member] | Fair value hedges [member]      
IfrsStatementLineItems [Line Items]      
Gains/ (losses) recognized in the statement of income     (297)
Swap IPCA X CDI [Member] | Interest rate risk [member] | Fair value hedges [member]      
IfrsStatementLineItems [Line Items]      
Gains/ (losses) recognized in the statement of income (78) 25 (50)
Others [Member] | Interest rate risk [member] | Fair value hedges [member]      
IfrsStatementLineItems [Line Items]      
Gains/ (losses) recognized in the statement of income     5
Commodity Derivatives [Member] | Other Commodity Derivative Transactions [Member] | Fair value hedges [member]      
IfrsStatementLineItems [Line Items]      
Gains/ (losses) recognized in the statement of income $ 42 $ 11 $ (256)