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Loan and Lease Operations Portfolio - Summary of Loan Operations and Lease Operations by Type (Parenthetical) (Detail) - BRL (R$) R$ in Millions	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Disclosure of loans and lease operations [Line Items]
Provision for Expected Loss	R$ (36,029)	R$ (33,373)
Commitments released	(3,303)	(2,601)	R$ (3,015)
Financial guarantees pledged [member]
Disclosure of loans and lease operations [Line Items]
Provision for Expected Loss	R$ (837)	R$ (1,191)

X

- Definition

The amount of an allowance account used to record impairments to financial assets due to credit losses. [Refer: Financial assets]

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Note Expiry date 2021-01-01
-Name IFRS
-Number 7
-IssueDate 2019-01-01
-Paragraph 16
-URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=7&code=ifrs-tx-2017-en-b&anchor=para_16&doctype=Standard&book=b
-URIDate 2019-03-27

+ Details

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Namespace Prefix:	ifrs-full_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

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

Expected loan losses commitments released

+ References

No definition available.

+ Details

Name:	itub_ExpectedLoanLossesCommitmentsReleased
Namespace Prefix:	itub_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

X

- Details

Name:	ifrs-full_CategoriesOfFinancialAssetsAxis=itub_FinancialGuaranteesPledgedMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: