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Business development (Details Narrative) R$ in Millions, $ in Millions |  |  |  | 1 Months Ended | 3 Months Ended | 12 Months Ended |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Nov. 03, 2023 USD ($) | Nov. 03, 2023 BRL (R$) | Jul. 08, 2022 BRL (R$) | Apr. 12, 2022 BRL (R$) | Aug. 31, 2024 | Sep. 30, 2023 BRL (R$) | Dec. 31, 2024 BRL (R$) shares | Dec. 31, 2023 BRL (R$) shares | Dec. 31, 2022 shares | Jul. 31, 2022 | Jan. 13, 2022 BRL (R$)
IfrsStatementLineItems [Line Items] |  |  |  |  |  |  |  |  |  |  |
Share issued | shares |  |  |  |  |  |  | 9,804,135,348 | 9,804,135,348 | 9,804,135,348 |  |
ITA? CHILE [Member] |  |  |  |  |  |  |  |  |  |  |
IfrsStatementLineItems [Line Items] |  |  |  |  |  |  |  |  |  |  |
Percentage of voting equity interests acquired |  |  |  |  |  |  |  |  |  | 65.62% |
Share issued | shares |  |  |  |  |  |  |  | 3,707,104 |  |  |
Acquisitions value | R$ |  |  |  |  |  |  |  | R$ 193 |  |  |
Ownership interest |  |  |  |  |  |  |  | 67.42% |  |  |
American Depositary Shares [Member] |  |  |  |  |  |  |  |  |  |  |
IfrsStatementLineItems [Line Items] |  |  |  |  |  |  |  |  |  |  |
Share issued | shares |  |  |  |  |  |  |  | 554,650 |  |  |
Equivalent [Member] |  |  |  |  |  |  |  |  |  |  |
IfrsStatementLineItems [Line Items] |  |  |  |  |  |  |  |  |  |  |
Share issued | shares |  |  |  |  |  |  |  | 184,883 |  |  |
Ideal Holding Financeira Sa Stage One [Member] |  |  |  |  |  |  |  |  |  |  |
IfrsStatementLineItems [Line Items] |  |  |  |  |  |  |  |  |  |  |
Percentage of voting equity interests acquired |  |  |  |  |  |  |  |  |  |  | 50.10%
Equity interests of acquirer | R$ |  |  |  |  |  |  |  |  |  |  | R$ 700
Zup I T Servicosem Tecnologiae Inovacao S. A. [Member] |  |  |  |  |  |  |  |  |  |  |
IfrsStatementLineItems [Line Items] |  |  |  |  |  |  |  |  |  |  |
Percentage of voting equity interests acquired |  |  |  |  |  |  |  | 20.57% |  |  |
Share issued | shares |  |  |  |  |  |  |  | 2,228,342 |  |  |
Capital amount | R$ |  |  |  |  |  |  |  | R$ 199 |  |  |
Percentage of voting equity interests acquired |  |  |  |  |  |  |  | 72.51% |  |  |
Itau Unibanco Holding [Member] |  |  |  |  |  |  |  |  |  |  |
IfrsStatementLineItems [Line Items] |  |  |  |  |  |  |  |  |  |  |
Share issued | shares |  |  |  |  |  |  | 200,628 |  |  |  |
Percentage of voting equity interests acquired |  |  |  |  |  |  | 1.32% |  |  |  |
Ownership interest, percentage |  |  |  |  | 33.60% |  |  |  |  |  |
Itau Unibanco Holding [Member] | Zup I T Servicosem Tecnologiae Inovacao S. A. [Member] |  |  |  |  |  |  |  |  |  |  |
IfrsStatementLineItems [Line Items] |  |  |  |  |  |  |  |  |  |  |
Percentage of voting equity interests acquired |  |  |  |  |  |  | 28.81% |  |  |  |
Share issued | shares |  |  |  |  |  |  | 3,178,623 |  |  |  |
Capital amount | R$ |  |  |  |  |  |  | R$ 312 |  |  |  |
Totvs Techfin S.A. [Member] |  |  |  |  |  |  |  |  |  |  |
IfrsStatementLineItems [Line Items] |  |  |  |  |  |  |  |  |  |  |
Percentage of voting equity interests acquired |  |  |  | 50.00% |  |  |  |  |  |  |
Acquisition date fair value of total consideration transferred | R$ |  |  |  | R$ 610 |  |  |  |  |  |  |
Payment of earnout compensation | R$ |  |  |  | R$ 450 |  |  |  |  |  |  |
Banco Itau Argentina S. A. [Member] |  |  |  |  |  |  |  |  |  |  |
IfrsStatementLineItems [Line Items] |  |  |  |  |  |  |  |  |  |  |
Transaction amount | $ 50 | R$ 253 |  |  |  | R$ 1,211 |  |  |  |  |
Avenue Holding Cayman Ltd [Member] |  |  |  |  |  |  |  |  |  |  |
IfrsStatementLineItems [Line Items] |  |  |  |  |  |  |  |  |  |  |
Percentage of voting equity interests acquired |  |  | 35.00% |  |  |  |  |  |  |  |
Ownership interest | R$ |  |  | R$ 563 |  |  |  |  |  |  |  |

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