XML 278 R113.htm IDEA: XBRL DOCUMENT
v3.20.1

Loan and Lease Operations Portfolio - Summary of Loan Operations and Lease Operations by Maturity (Detail) - BRL (R$) R$ in Millions | Dec. 31, 2019 | Dec. 31, 2018
--- | --- | ---
Disclosure of loans and lease operations [Line Items] |  |
Loan operations and lease operations by type | R$ 585,791 | R$ 536,091
Overdue as from 1 day [member] |  |
Disclosure of loans and lease operations [Line Items] |  |
Loan operations and lease operations by type | 21,263 | 19,563
Falling due up to 3 months [member] |  |
Disclosure of loans and lease operations [Line Items] |  |
Loan operations and lease operations by type | 165,028 | 144,812
Falling due from 3 months to 12 months [member] |  |
Disclosure of loans and lease operations [Line Items] |  |
Loan operations and lease operations by type | 149,388 | 127,805
Falling due after 1 year [member] |  |
Disclosure of loans and lease operations [Line Items] |  |
Loan operations and lease operations by type | R$ 250,112 | R$ 243,911

X
- Definition Disclosure of loans and lease operations + References No definition available. + Details
Name: | itub_DisclosureOfLoansAndLeaseOperationsLineItems
Namespace Prefix: | itub_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Loan operations and lease operations portfolio gross. + References No definition available. + Details
Name: | itub_LoanOperationsAndLeaseOperationsPortfolioGross
Namespace Prefix: | itub_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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

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

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

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