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Cash and cash equivalents (Tables)
 12 Months Ended
Dec. 31, 2025
Notes and other explanatory information [abstract]  
Schedule of cash and balances
     
Thousand of Reais 2025 2024 2023
Cash 3,059,750 3,639,280 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 73,272,606 67,200,905 89,417,760