XML 105 R233.htm IDEA: XBRL DOCUMENT
v3.20.1

Risk and Capital Management - Summary of Risk Level of Financial Assets (Parenthetical) (Detail) - BRL (R$) R$ in Millions | Dec. 31, 2019 | Dec. 31, 2018
--- | --- | ---
Disclosure of risk level of financial assets [Line Items] |  |
Derivatives assets | R$ 41,854 | R$ 23,466
Insurance financial assets [member] |  |
Disclosure of risk level of financial assets [Line Items] |  |
Derivatives assets | R$ 960 | R$ 449

X
- Definition The amount of financial assets classified as derivative instruments. [Refer: Financial assets; Derivatives [member]] + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 1 -IssueDate 2019-01-01 -Paragraph 55 -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=1&code=ifrs-tx-2019-en-r&anchor=para_55&doctype=Standard -URIDate 2019-03-27 + Details
Name: | ifrs-full_DerivativeFinancialAssets
Namespace Prefix: | ifrs-full_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Disclosure of risk level of financial assets + References No definition available. + Details
Name: | itub_DisclosureOfRiskLevelOfFinancialAssetsLineItems
Namespace Prefix: | itub_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Details
Name: | ifrs-full_TypesOfFinancialAssetsAxis=itub_InsuranceFinancialAssetsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |