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v3.25.1

Stockholders' equity (Details 1) - $ / shares | 12 Months Ended
--- | ---
Dec. 31, 2024 | Dec. 31, 2023
Preference shares [member] |  |
IfrsStatementLineItems [Line Items] |  |
Market value minimum | $ 31.42 | $ 25.52
Market value weighted average | 32.83 | 26.49
Market value maximum | 33.66 | 27.13
Average cost | 32.43 | 25.98
Market price per share | 30.73 | 33.97
Ordinary shares [member] |  |
IfrsStatementLineItems [Line Items] |  |
Market price per share | $ 26.90 | $ 28.84

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- 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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- References No definition available. + Details
Name: | itub_MarketValueMaximumPerShare
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_MarketValueMinimumPerShare
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_MarketValuePricePerShare
Namespace Prefix: | itub_
Data Type: | dtr-types:perShareItemType
Balance Type: | na
Period Type: | instant

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- References No definition available. + Details
Name: | itub_MarketValueWeightedAverage
Namespace Prefix: | itub_
Data Type: | dtr-types:perShareItemType
Balance Type: | na
Period Type: | duration

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

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