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v3.23.1

Insurance contracts and private pension (Details 1) - BRL (R$) R$ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2022 | Dec. 31, 2021 | Dec. 31, 2020
IfrsStatementLineItems [Line Items] |  |  |
Premiums and contributions | R$ 18,122 | R$ 15,023 | R$ 14,804
Group Accident Insurance [Member] |  |  |
IfrsStatementLineItems [Line Items] |  |  |
Premiums and contributions | 973 | 883 | 847
Individual Accident [Member] |  |  |
IfrsStatementLineItems [Line Items] |  |  |
Premiums and contributions | 149 | 175 | 187
Disability Savings Pension [Member] |  |  |
IfrsStatementLineItems [Line Items] |  |  |
Premiums and contributions | 292 | 240 | 258
Plan Generator of Benefits [Member] |  |  |
IfrsStatementLineItems [Line Items] |  |  |
Premiums and contributions | 2,974 | 2,460 | 2,235
Credit Life [Member] |  |  |
IfrsStatementLineItems [Line Items] |  |  |
Premiums and contributions | 1,412 | 1,008 | 624
Random Events [Member] |  |  |
IfrsStatementLineItems [Line Items] |  |  |
Premiums and contributions | 216 | 192 | 195
Multiple Risks [Member] |  |  |
IfrsStatementLineItems [Line Items] |  |  |
Premiums and contributions | 645 | 542 | 370
MortagageInsuranceinMarketPoliciesCreditLifeInsurance [Member] |  |  |
IfrsStatementLineItems [Line Items] |  |  |
Premiums and contributions | 571 | 437 | 339
Traditional Insurance [Member] |  |  |
IfrsStatementLineItems [Line Items] |  |  |
Premiums and contributions | 123 | 128 | 117
VGBL [Member] |  |  |
IfrsStatementLineItems [Line Items] |  |  |
Premiums and contributions | 8,496 | 7,054 | 8,022
Group Life [Member] |  |  |
IfrsStatementLineItems [Line Items] |  |  |
Premiums and contributions | 1,422 | 1,165 | 955
Other Lines [Member] |  |  |
IfrsStatementLineItems [Line Items] |  |  |
Premiums and contributions | R$ 849 | R$ 739 | R$ 655

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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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- Definition Insurance premiums and contributions issued. + 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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- Details
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Data Type: | na
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- Details
Name: | ifrs-full_TypesOfInsuranceContractsAxis=itub_IndividualAccidentMember
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Data Type: | na
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- Details
Name: | ifrs-full_TypesOfInsuranceContractsAxis=itub_DisabilitySavingsPensionMember
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Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | ifrs-full_TypesOfInsuranceContractsAxis=itub_PlanGeneratorOfBenefitsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | ifrs-full_TypesOfInsuranceContractsAxis=itub_CreditLifeMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
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- Details
Name: | ifrs-full_TypesOfInsuranceContractsAxis=itub_RandomEventsMember
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Data Type: | na
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- Details
Name: | ifrs-full_TypesOfInsuranceContractsAxis=itub_MultipleRisksMember
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Data Type: | na
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- Details
Name: | ifrs-full_TypesOfInsuranceContractsAxis=itub_MortagageinsuranceinmarketpoliciescreditlifeinsuranceMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
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- Details
Name: | ifrs-full_TypesOfInsuranceContractsAxis=itub_TraditionalInsuranceMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | ifrs-full_TypesOfInsuranceContractsAxis=itub_VgblMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | ifrs-full_TypesOfInsuranceContractsAxis=itub_GroupLifeMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | ifrs-full_TypesOfInsuranceContractsAxis=itub_OtherLinesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |