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v3.22.1

Risk and Capital Management - Summary of Risks of Insurance and Private Pension (Detail) - BRL (R$) R$ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
Group Accident Insurance [Member] |  |  |
Disclosure of insurance risk [Line Items] |  |  |
Insurance premiums | R$ 884 | R$ 849 | R$ 867
Retained premium | R$ 883 | R$ 847 | R$ 867
Retention | 99.90% | 99.80% | 100.00%
Individual Accident [Member] |  |  |
Disclosure of insurance risk [Line Items] |  |  |
Insurance premiums | R$ 176 | R$ 192 | R$ 222
Retained premium | R$ 175 | R$ 187 | R$ 222
Retention | 99.40% | 97.40% | 100.00%
Home insurance in market policies credit life [Member] |  |  |
Disclosure of insurance risk [Line Items] |  |  |
Insurance premiums | R$ 1,008 | R$ 624 | R$ 948
Retained premium | R$ 1,008 | R$ 624 | R$ 946
Retention | 100.00% | 100.00% | 99.80%
Group Life |  |  |
Disclosure of insurance risk [Line Items] |  |  |
Insurance premiums | R$ 1,168 | R$ 956 | R$ 948
Retained premium | R$ 1,165 | R$ 955 | R$ 947
Retention | 99.70% | 99.90% | 99.90%

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- Definition Line items represents insurance risk. + References No definition available. + Details
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Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition Reinsurance Premium. + References No definition available. + Details
Name: | itub_ReinsurancePremium
Namespace Prefix: | itub_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Definition Retained premiums. + References No definition available. + Details
Name: | itub_RetainedPremiums
Namespace Prefix: | itub_
Data Type: | xbrli:monetaryItemType
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- Definition Retention Percentage + References No definition available. + Details
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Balance Type: | na
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- Details
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Namespace Prefix: |
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Balance Type: |
Period Type: |

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

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- Details
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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: |