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Derivatives (Details Narrative) - BRL (R$) R$ in Millions	Dec. 31, 2022	Dec. 31, 2021
Government Securities [member]
IfrsStatementLineItems [Line Items]
Total value of margins pledged in guarantee	R$ 12,155	R$ 11,011

X

- Definition

Derivatives pledges as collateral.

+ References

No definition available.

+ Details

Name:	itub_DerivativesPledgesAsCollateral
Namespace Prefix:	itub_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

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- References

No definition available.

+ Details

Name:	itub_IfrsStatementLineItems
Namespace Prefix:	itub_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- Details

Name:	ifrs-full_ClassesOfFinancialAssetsAxis=itub_GovernmentSecuritiesMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: