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Accounting policies and determination criteria (Details) - Derivatives [member] - BRL (R$) R$ in Thousands | Dec. 31, 2025 | Dec. 31, 2024
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IfrsStatementLineItems [Line Items] |  |
Gross financial assets subject to offsetting, enforceable master netting arrangements or similar agreements | R$ 70,667,950 | R$ 42,380,547
Financial assets offset in the balance sheet | (4,860,252) | (2,174,248)
Net financial assets subject to offsetting, enforceable master netting arrangements or similar agreements in statement of financial position | 65,807,698 | 40,206,299
Gross financial liabilities subject to offsetting, enforceable master netting arrangements or similar agreements | 64,872,243 | 41,584,522
Financial liabilities offset in the balance sheet | (4,860,252) | (2,174,248)
Net financial liabilities subject to offsetting, enforceable master netting arrangements or similar agreements in statement of financial position | R$ 60,011,991 | R$ 39,410,274

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