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Banking service fees - Schedule of Banking Service Fees (Detail) - BRL (R$) R$ in Millions | 12 Months Ended
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Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Banking Service Fees [Abstract] |  |  |
Fees from credit and debit card services | R$ 15,394 | R$ 14,802 | R$ 14,002
Current account services | 10,017 | 9,589 | 8,856
Asset management fees | 5,013 | 4,141 | 3,514
Fees for guarantees issued and credit lines | 1,768 | 1,783 | 1,773
Collection commissions | 1,506 | 1,378 | 1,315
Brokerage commission | 618 | 606 | 295
Other | 2,493 | 2,149 | 2,163
Total | R$ 36,809 | R$ 34,448 | R$ 31,918

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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 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