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v3.23.1

Interest and similar income and expenses and income of financial assets and liabilities at fair value through profit or loss (Details Narrative) - BRL (R$) R$ in Millions | 12 Months Ended
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Dec. 31, 2022 | Dec. 31, 2021
IfrsStatementLineItems [Line Items] |  |
Financial assets, expense recognized on expected losses | R$ 120 | R$ 1,127
Financial assets at amortised cost, class [member] |  |
IfrsStatementLineItems [Line Items] |  |
Total loss, net of reversals | 90 | 1,117
Financial assets at fair value through other comprehensive income, category [member] |  |
IfrsStatementLineItems [Line Items] |  |
Total loss, net of reversals | R$ 30 | R$ 10

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- Definition The amount of impairment loss on financial assets. [Refer: Financial assets; Impairment loss] + 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 20 -Subparagraph e -URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=7&code=ifrs-tx-2017-en-b&anchor=para_20_e&doctype=Standard&book=b -URIDate 2022-03-24 + Details
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Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition Gain loss on reversal of derivatives. + References No definition available. + Details
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Data Type: | xbrli:monetaryItemType
Balance Type: | credit
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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- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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