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Hedge accounting (Details Narrative) - BRL (R$) | 12 Months Ended
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Dec. 31, 2022 | Dec. 31, 2021
IfrsStatementLineItems [Line Items] |  |
Description of type of hedge | There are three types of hedge relations: Fair value hedge, Cash flow hedge and Hedge of net investment in foreign operations. |
Risk factor designated coverage ratio | 100.00% |
Balance reserve in cash flow hedge for which hedge accounting is no longer applied | R$ 187,000,000 | R$ 555,000,000
Reversal of hedging | 7,049,000,000 | 11,752,000,000
Foreign currency conversion reserve | R$ (3,116,000,000) | (5,265,000,000)
Fair value of hedge securities, other comprehensive income |  | 125
Cash flow hedges [member] |  |
IfrsStatementLineItems [Line Items] |  |
Reversal of hedging |  | R$ 8,001

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- Definition The description of the type of a hedge used by the entity. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Note Expiry date 2023-01-01 -Name IFRS -Number 7 -IssueDate 2022-03-24 -Paragraph 22 -Subparagraph a -URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=7&code=ifrs-tx-2017-en-b&anchor=para_22_a&doctype=Standard&book=b -URIDate 2022-03-24 + Details
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Balance Type: | na
Period Type: | duration

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- Definition A component of equity representing the reserve of cash flow hedges in relation to hedging relationships for which hedge accounting is no longer applied. [Refer: Reserve of cash flow hedges] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 7 -IssueDate 2022-03-24 -Paragraph 24B -Subparagraph b -Clause iii -URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=7&code=ifrs-tx-2022-en-r&anchor=para_24B_b_iii&doctype=Standard -URIDate 2022-03-24 + Details
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Data Type: | xbrli:monetaryItemType
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Period Type: | instant

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

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- Definition Foreign currency conversion reserve . + References No definition available. + Details
Name: | itub_ForeignCurrencyConversionReserve
Namespace Prefix: | itub_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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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 Reversal of hedging . + References No definition available. + Details
Name: | itub_ReversalOfHedging
Namespace Prefix: | itub_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition Risk exposure, coverage percentage. + References No definition available. + Details
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Namespace Prefix: | itub_
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Balance Type: | na
Period Type: | duration

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