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Investments in associates and joint ventures (Details 4) - BRL (R$)
R$ in Thousands
Dec. 31, 2025
Dec. 31, 2024
Notes and other explanatory information [abstract]    
Balance at the beginning of the fiscal year R$ 975,731 R$ 878,944
Change in corporate participation
Addition/(disposal)  186
Capital decreases/reduction
Equity method results 135,501 91,947
Dividends (279,091) (81,467)
Adjustment to fair value 34,854 86,121
Balance at the end of the fiscal year 866,995 975,731
Significant Influence of Banco Santander    
Balance at beginning of year 2,664,444 730,836
Change in corporate participation 70,388
Equity method results 322,812 221,039
Dividends (347,427) (297,832)
Addition/(disposal) (1) 7,500 2,011,369
Capital decreases/reduction 28 (2,364)
(-) Amortization (94,543)
Adjustment to fair value (1,142) 1,396
Balance at the end of the fiscal year R$ 2,650,098 R$ 2,664,444