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Tax assets and liabilities (Details 1) - BRL (R$) R$ in Thousands	12 Months Ended
	Dec. 31, 2025	Dec. 31, 2024	Dec. 31, 2023
Notes and other explanatory information [abstract]
Gains losses arising from exchange rate fluctuations on the banks investments	R$ (7,474,761)	R$ 13,627,778	R$ (3,281,452)
Income generated from the use of derivative contracts as foreign exchange hedge	7,838,473	(14,292,394)	3,444,617
Tax effect of derivative contracts used as hedge - PIS / COFINS	R$ (363,712)	R$ 664,616	R$ (163,165)

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