XML 42 R108.htm IDEA: XBRL DOCUMENT
v3.20.1

Financial Assets at Amortized Cost-Securities - Summary of Financial Assets at Amortized Cost - Securities (Parenthetical) (Detail) - BRL (R$) R$ in Millions | Dec. 31, 2019 | Dec. 31, 2018
--- | --- | ---
Disclosure of Financial Assets [Line Items] |  |
Securities Pledged as Collateral of Funding Transactions of Financial Institutions and Clients | R$ 27,040 | R$ 33,848
Brazilian government securities [member] |  |
Disclosure of Financial Assets [Line Items] |  |
Securities Pledged as Collateral of Funding Transactions of Financial Institutions and Clients | 9,583 | 24,988
Corporate debt securities [member] |  |
Disclosure of Financial Assets [Line Items] |  |
Securities Pledged as Collateral of Funding Transactions of Financial Institutions and Clients | R$ 17,457 | R$ 8,860

X
- Definition Line items represent concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes of the table. + References No definition available. + Details
Name: | ifrs-full_DisclosureOfFinancialAssetsLineItems
Namespace Prefix: | ifrs-full_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition The amount of financial assets that the entity has pledged as collateral for liabilities or contingent liabilities, including amounts that have been reclassified in accordance with paragraph 3.2.23(a) of IFRS 9. [Refer: Contingent liabilities [member]; Financial assets] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 7 -IssueDate 2019-01-01 -Paragraph 14 -Subparagraph a -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=7&code=ifrs-tx-2019-en-r&anchor=para_14_a&doctype=Standard -URIDate 2019-03-27 + Details
Name: | ifrs-full_FinancialAssetsPledgedAsCollateralForLiabilitiesOrContingentLiabilities
Namespace Prefix: | ifrs-full_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Details
Name: | ifrs-full_ClassesOfFinancialAssetsAxis=itub_BrazilianGovernmentSecuritiesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_ClassesOfFinancialAssetsAxis=itub_CorporateDebtSecuritiesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |