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Gains (losses) on financial assets and liabilities (net) (Details) - BRL (R$)
R$ in Thousands
12 Months Ended
Dec. 31, 2025
Dec. 31, 2024
Dec. 31, 2023
Gains Losses On Financial Assets And Liabilities      
     Financial Assets Measured At Fair Value Through Profit Or Loss (1) R$ 7,889,797 R$ (641,147) R$ 3,440,830
     Financial Assets Not Measured At Fair Value Through Profit Or Loss (416,389) (180,427) (463,844)
     Debt instruments (401,079) (105,789) (42,405)
     Equity instruments (15,310) (74,638) (421,439)
 Of which:  Financial Assets Measured At Fair Value Through Other Comprehensive Income      
    Gains or losses from hedge accounting, net  3,471,911 (537,100) (247,467)
Total R$ 10,945,319 R$ (1,358,674) R$ 2,729,519