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v3.23.1

Stockholders' equity (Details 1) - $ / shares | 12 Months Ended
--- | ---
Dec. 31, 2022 | Dec. 31, 2021
Preference shares [member] |  |
IfrsStatementLineItems [Line Items] |  |
Average cost | $ 21.76 | $ 21.76
Market price per share | 25.00 | 20.95
Ordinary shares [member] |  |
IfrsStatementLineItems [Line Items] |  |
Market price per share | $ 21.89 | $ 19.09

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- Definition Average share price. + References No definition available. + Details
Name: | itub_AverageSharePrice
Namespace Prefix: | itub_
Data Type: | dtr-types:perShareItemType
Balance Type: | na
Period Type: | duration

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

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- Definition Market value price per share. + References No definition available. + Details
Name: | itub_MarketValuePricePerShare
Namespace Prefix: | itub_
Data Type: | dtr-types:perShareItemType
Balance Type: | na
Period Type: | instant

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- Details
Name: | ifrs-full_ClassesOfShareCapitalAxis=ifrs-full_PreferenceSharesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_ClassesOfShareCapitalAxis=ifrs-full_OrdinarySharesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |