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Tax assets and liabilities (Details 3) - BRL (R$)
R$ in Thousands
 12 Months Ended
Dec. 31, 2025
Dec. 31, 2024
Dec. 31, 2023
Notes and other explanatory information [abstract]      
Tax credits recognized in equity R$ 315,477,464 R$ 339,389,357 R$ 139,356,609
Measurement of securities at fair value through other comprehensive income 308,792,800 333,401,042 136,550,936
Measurement of cash flow hedge 3,032,990 2,607,676 223,487
Measurement of investment hedge 1,421,361 562,353 562,353
Measurement of defined benefit plan 2,230,313 2,818,286 2,019,833
Tax expenses recognized in equity (320,585,520) (346,808,871) (140,799,732)
Measurement of securities at fair value through other comprehensive income (309,559,753) (335,837,710) (133,417,362)
Measurement of cash flow hedge (3,361,605) (2,628,353) (430,444)
Measurement of investment hedge (1,421,361) (1,421,361) (1,421,361)
Measurement of defined benefit plan (6,242,801) (6,921,447) (5,530,565)
Total R$ (5,108,056) R$ (7,419,514) R$ (1,443,123)