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Derivatives - Summary of Derivative Contracts Maturity (Parenthetical) (Detail) - BRL (R$) R$ in Millions | Dec. 31, 2021 | Dec. 31, 2020
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London Interbank Offered Rate LIBOR [Member] |  |
Disclosure of maturity analysis for derivative financial liabilities [line items] |  |
Financial Asset | R$ 289,252 | R$ 353,672

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- Definition Line items represent concepts included in a table. These concepts are used to disclose reportable information associated with members defined in one or many axes of the table. + References No definition available. + Details
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Namespace Prefix: | ifrs-full_
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Balance Type: | na
Period Type: | duration

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- Definition Financial Asset. + References No definition available. + Details
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Namespace Prefix: | itub_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |