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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

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