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Intangible assets - Goodwill (Details 2) - 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$ 27,892,878 | R$ 27,852,568
Acquisitions (write-offs): |  |
Banco ABN Amro Real S.A. (Banco Real) |  | 1
Mobills Labs Soluções em Tecnologia LTDA | (4,106) |
APE11 Tecnologia e Negocios Imobiliarios S.A. (Note 3.h) | (9,777) |
Return Capital Gestão de Ativos e Participações S.A. |  | (5,271)
FIT Economia de Energia S.A. |  | 3,992
América Gestão Serviços em Energia S.A. | (34,321) | 61,608
Return Capital Serviços de Recuperação de Créditos S.A. (current name of Ipanema Empreendimentos e Participações S.A.) |  | (20,020)
Balance at the end of the fiscal year | R$ 27,844,674 | R$ 27,892,878

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