XML 208 R171.htm IDEA: XBRL DOCUMENT
v3.22.1

Taxes - Additional Information (Detail) - BRL (R$) | Dec. 31, 2021 | Dec. 31, 2020
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Disclosure of Taxes [Line Items] |  |
Unrecorded deferred tax assets | R$ 1,909,000,000 | R$ 780,000,000

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- Definition Disclosure of Taxes. + References No definition available. + Details
Name: | itub_DisclosureOfTaxesLineItems
Namespace Prefix: | itub_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition Unrecognized deferred tax assets. + References No definition available. + Details
Name: | itub_UnrecognizedDeferredTaxAssets
Namespace Prefix: | itub_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant