Cash and cash equivalents (Details) - BRL (R$) R$ in Thousands |
Dec. 31, 2025 |
Dec. 31, 2024 |
Dec. 31, 2023 |
|---|---|---|---|
| Notes and other explanatory information [abstract] | |||
| Cash | R$ 3,059,750 | R$ 3,639,280 | R$ 3,770,483 |
| Cash and Cash Equivalents and Investments in Foreign Currency Overseas | 17,172,979 | 33,444,974 | 19,352,067 |
| Repurchase Agreements | 52,822,160 | 28,103,405 | 65,766,340 |
| Investments in Interbank Deposit Certificates (CDI) | 217,717 | 2,013,246 | 528,870 |
| Total | R$ 73,272,606 | R$ 67,200,905 | R$ 89,417,760 |