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Derivative financial instruments (Details) - BRL (R$)
R$ in Thousands
Dec. 31, 2025
Dec. 31, 2024
Derivative Financial Instruments    
Swap Differentials Receivable R$ 11,595,591 R$ 16,710,659
Option Premiums to Exercise 6,312,487 4,960,933
Forward Contracts and Others 47,899,620 18,534,707
Trading Derivative And Used As Hedge Assets Total 65,807,698 40,206,299
Swap Differentials Payable 11,893,221 16,746,167
Option Premiums Launched 5,970,844 4,455,074
Forward Contracts and Others 42,147,926 18,209,033
Trading Derivative And Used As Hedge Liabilities Total R$ 60,011,991 R$ 39,410,274