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v3.23.1

Significant accounting policies (Details Narrative) | 12 Months Ended
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Dec. 31, 2022 Integer
IfrsStatementLineItems [Line Items] |
Percentage of variation in total assets due to transition to IFRS 16 | 10.00%
Number of reportable segments | 3
Bottom of range [member] |
IfrsStatementLineItems [Line Items] |
Consolidated companies percentage as total consolidated assets, as well as interests in their voting capital | 95.00%

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- Definition Aggregate percentage of consolidated companies to consolidated assets + References No definition available. + Details
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Namespace Prefix: | itub_
Data Type: | dtr-types:percentItemType
Balance Type: | na
Period Type: | duration

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- References No definition available. + Details
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Namespace Prefix: | itub_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition Number of Reportable Segments1 + References No definition available. + Details
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Namespace Prefix: | itub_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration

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- Definition Percentage of variation in total assets due to transition to IFRS 16. + References No definition available. + Details
Name: | itub_PercentageOfVariationInTotalAssetsDueToTransitionToIFRS16
Namespace Prefix: | itub_
Data Type: | dtr-types:percentItemType
Balance Type: | na
Period Type: | duration

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