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Commissions and Banking fees - Schedule of Commissions and Banking fees (Detail) - BRL (R$) R$ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
Banking Service Fees [Abstract] |  |  |
Credit and debit cards | R$ 16,051 | R$ 13,813 | R$ 15,619
Current account services | 7,803 | 8,002 | 7,969
Asset management | 7,177 | 6,951 | 6,322
Funds | 6,545 | 6,316 | 5,702
Consortia | 632 | 635 | 620
Credit operations and financial guarantees provided | 2,511 | 2,298 | 2,418
Credit operations | 1,307 | 964 | 1,048
Financial guarantees provided | 1,204 | 1,334 | 1,370
Collection services | 2,020 | 1,897 | 1,831
Advisory services and brokerage | 3,579 | 2,891 | 2,509
Custody services | 605 | 573 | 501
Other | 2,578 | 2,132 | 1,863
Total | R$ 42,324 | R$ 38,557 | R$ 39,032

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- Definition Asset management fees consortia income. + 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 Asset management fees funds income. + References No definition available. + Details
Name: | itub_AssetManagementFeesFundsIncome
Namespace Prefix: | itub_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition Asset management fees income. + References No definition available. + Details
Name: | itub_AssetManagementFeesIncome
Namespace Prefix: | itub_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Definition The amount of fees relating to banking service. + References No definition available. + Details
Name: | itub_BankingServiceFees
Namespace Prefix: | itub_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Definition Banking Service Fees [Abstract] + References No definition available. + Details
Name: | itub_BankingServiceFeesAbstract
Namespace Prefix: | itub_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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

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

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- Definition Current account services. + References No definition available. + Details
Name: | itub_CurrentAccountServices
Namespace Prefix: | itub_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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

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- Definition Fees for credit lines. + References No definition available. + Details
Name: | itub_FeesForCreditLines
Namespace Prefix: | itub_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition Fees for financial guarantees Issued. + References No definition available. + Details
Name: | itub_FeesForFinancialGuaranteesIssued
Namespace Prefix: | itub_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition Fees for guarantees issued and credit lines. + References No definition available. + Details
Name: | itub_FeesForGuaranteesIssuedAndCreditLines
Namespace Prefix: | itub_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition Fees from credit and debit card services. + References No definition available. + Details
Name: | itub_FeesFromCreditAndDebitCardServices
Namespace Prefix: | itub_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition Other banking services. + References No definition available. + Details
Name: | itub_OtherBankingServices
Namespace Prefix: | itub_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration