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v3.23.1

Insurance contracts and private pension (Details 4) - BRL (R$) R$ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2022 | Dec. 31, 2021
IfrsStatementLineItems [Line Items] |  |
Beginning Balance | R$ 631 | R$ 496
Increase | 1,559 | 1,298
Amortization | (1,379) | (1,163)
Ending Balance | 811 | 631
Not later than one year [member] |  |
IfrsStatementLineItems [Line Items] |  |
Beginning Balance | 573 | 464
Later than one year [member] |  |
IfrsStatementLineItems [Line Items] |  |
Beginning Balance | R$ 238 | R$ 167

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- Definition The amount of amortisation of deferred losses (gains) arising from the purchase of reinsurance. [Refer: Depreciation and amortisation expense; Gains (losses) recognised in profit or loss on buying reinsurance] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Note Expiry date 2023-01-01 -Name IFRS -Number 4 -IssueDate 2022-03-24 -Paragraph 37 -Subparagraph b -Clause ii -URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=4&code=ifrs-tx-2022-en-b&anchor=para_37_b_ii&doctype=Standard&book=b -URIDate 2022-03-24 + Details
Name: | ifrs-full_AmortisationOfGainsAndLossesArisingOnBuyingReinsurance
Namespace Prefix: | ifrs-full_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition The increase (decrease) in reinsurance assets. [Refer: Reinsurance assets] + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Note Expiry date 2023-01-01 -Name IFRS -Number 4 -IssueDate 2022-03-24 -Paragraph 37 -Subparagraph e -URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=4&code=ifrs-tx-2022-en-b&anchor=para_37_e&doctype=Standard&book=b -URIDate 2022-03-24 Reference 2: http://www.xbrl.org/2003/role/exampleRef -Note Expiry date 2023-01-01 -Name IFRS -Number 4 -IssueDate 2022-03-24 -Paragraph IG37 -URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=4&code=ifrs-tx-2022-en-b&anchor=para_IG37&doctype=Implementation%20Guidance&book=b -URIDate 2022-03-24 + Details
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Namespace Prefix: | ifrs-full_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition The amount of a cedant’s net contractual rights under a reinsurance contract. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Note Expiry date 2023-01-01 -Name IFRS -Number 4 -IssueDate 2022-03-24 -Paragraph 37 -Subparagraph e -URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=4&code=ifrs-tx-2022-en-b&anchor=para_37_e&doctype=Standard&book=b -URIDate 2022-03-24 + Details
Name: | ifrs-full_ReinsuranceAssets
Namespace Prefix: | ifrs-full_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
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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- References No definition available. + Details
Name: | itub_ReinsuranceAsset
Namespace Prefix: | itub_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Details
Name: | ifrs-full_MaturityAxis=ifrs-full_NotLaterThanOneYearMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | ifrs-full_MaturityAxis=ifrs-full_LaterThanOneYearMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |