XML 289 R237.htm IDEA: XBRL DOCUMENT v3.19.1

Risk and Capital Management - Summary of Composition of the Operational Risk Weighted Assets (RWAOPAD) (Detail) - BRL (R$) R$ in Millions	Dec. 31, 2018	Dec. 31, 2017
Disclosure of risk management strategy related to hedge accounting [line items]
Risk-weighted assets of operational risk (RWAOPAD)	R$ 72,833	R$ 63,277
Retail risk [Member]
Disclosure of risk management strategy related to hedge accounting [line items]
Risk-weighted assets of operational risk (RWAOPAD)	12,822	11,870
Commercial risk [Member]
Disclosure of risk management strategy related to hedge accounting [line items]
Risk-weighted assets of operational risk (RWAOPAD)	26,214	24,857
Corporate finance risk [Member]
Disclosure of risk management strategy related to hedge accounting [line items]
Risk-weighted assets of operational risk (RWAOPAD)	2,697	2,663
Negotiation and sales risk [Member]
Disclosure of risk management strategy related to hedge accounting [line items]
Risk-weighted assets of operational risk (RWAOPAD)	11,736	7,434
Payments and settlement risk [Member]
Disclosure of risk management strategy related to hedge accounting [line items]
Risk-weighted assets of operational risk (RWAOPAD)	8,282	7,532
Financial agent services risk [Member]
Disclosure of risk management strategy related to hedge accounting [line items]
Risk-weighted assets of operational risk (RWAOPAD)	4,343	3,893
Asset management risk [Member]
Disclosure of risk management strategy related to hedge accounting [line items]
Risk-weighted assets of operational risk (RWAOPAD)	6,715	5,010
Retail brokerage risk [Member]
Disclosure of risk management strategy related to hedge accounting [line items]
Risk-weighted assets of operational risk (RWAOPAD)	R$ 24	R$ 18

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_DisclosureOfRiskManagementStrategyRelatedToHedgeAccountingLineItems
Namespace Prefix:	ifrs-full_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Risk-weighted assets of operational risk.

+ References

No definition available.

+ Details

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

X

- Details

Name:	ifrs-full_TypesOfRisksAxis=itub_RetailRiskMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	ifrs-full_TypesOfRisksAxis=itub_CommercialRiskMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	ifrs-full_TypesOfRisksAxis=itub_CorporateFinanceRiskMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	ifrs-full_TypesOfRisksAxis=itub_NegotiationAndSalesRiskMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	ifrs-full_TypesOfRisksAxis=itub_PaymentsAndSettlementRiskMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	ifrs-full_TypesOfRisksAxis=itub_FinancialAgentServicesRiskMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	ifrs-full_TypesOfRisksAxis=itub_AssetManagementRiskMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	ifrs-full_TypesOfRisksAxis=itub_RetailBrokerageRiskMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: