Post-employment benefits (Details Narrative) - BRL (R$) R$ in Millions	Dec. 31, 2023	Dec. 31, 2022
IfrsStatementLineItems [Line Items]
Plan assets, at fair value	R$ 23,754	R$ 21,933
Itau Unibanco Holding [Member]
IfrsStatementLineItems [Line Items]
Plan assets, at fair value	1	1
Itau Unibanco Holding [Member] \| Real Estate 2 [Member]
IfrsStatementLineItems [Line Items]
Plan assets, at fair value	R$ 464	R$ 420

The fair value of defined benefit plan assets. Plan assets comprise assets held by a long-term employee benefit fund and qualifying insurance policies. [Refer: At fair value [member]]

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Name IAS
-Number 19
-IssueDate 2023-01-01
-Paragraph 57
-Subparagraph a
-URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=19&code=ifrs-tx-2023-en-r&anchor=para_57_a&doctype=Standard
-URIDate 2023-03-23

Name:	ifrs-full_PlanAssetsAtFairValue
Namespace Prefix:	ifrs-full_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant