XML 167 R115.htm IDEA: XBRL DOCUMENT v3.19.1

Financial Assets at Amortized Cost-Securities - Summary of Amortized Cost of Financial Assets at Amortized Cost (Detail) - BRL (R$) R$ in Millions	Dec. 31, 2018	Dec. 31, 2017	Jan. 01, 2017
Disclosure of maturity analysis for derivative financial assets designated at fair value through profit or loss [Line Items]
Amortized cost	R$ 994,759	R$ 905,729	R$ 902,289
Financial assets securities [Member]
Disclosure of maturity analysis for derivative financial assets designated at fair value through profit or loss [Line Items]
Amortized cost	110,395	111,424
Fair Value	106,749	106,242
Financial assets securities [Member] | Current [Member]
Disclosure of maturity analysis for derivative financial assets designated at fair value through profit or loss [Line Items]
Amortized cost	14,661	26,057
Fair Value	14,119	25,652
Financial assets securities [Member] | Current [Member] | Up to one year [Member]
Disclosure of maturity analysis for derivative financial assets designated at fair value through profit or loss [Line Items]
Amortized cost	14,661	26,057
Fair Value	14,119	25,652
Financial assets securities [Member] | Non-current [Member]
Disclosure of maturity analysis for derivative financial assets designated at fair value through profit or loss [Line Items]
Amortized cost	95,734	85,367
Fair Value	92,630	80,590
Financial assets securities [Member] | Non-current [Member] | From one to five years [Member]
Disclosure of maturity analysis for derivative financial assets designated at fair value through profit or loss [Line Items]
Amortized cost	51,820	53,303
Fair Value	50,970	50,650
Financial assets securities [Member] | Non-current [Member] | From five to ten years [Member]
Disclosure of maturity analysis for derivative financial assets designated at fair value through profit or loss [Line Items]
Amortized cost	31,318	19,883
Fair Value	29,802	18,571
Financial assets securities [Member] | Non-current [Member] | After ten years [Member]
Disclosure of maturity analysis for derivative financial assets designated at fair value through profit or loss [Line Items]
Amortized cost	12,596	12,181
Fair Value	R$ 11,858	R$ 11,369

X

- Definition

The amount of financial assets at amortised cost. The amortised cost is the amount at which financial assets are measured at initial recognition minus principal repayments, plus or minus the cumulative amortisation using the effective interest method of any difference between that initial amount and the maturity amount, and adjusted for any impairment. [Refer: Financial assets]

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Note Effective 2018-01-01
-Name IFRS
-Number 7
-IssueDate 2017-01-01
-Paragraph 8
-Subparagraph f
-URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=7&date=2017-03-01&anchor=para_8_f&doctype=Standard
-URIDate 2017-03-09

+ Details

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

X

- Definition

The fair value of financial assets. [Refer: At fair value [member]; Financial assets]

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name IFRS
-Number 7
-IssueDate 2017-01-01
-Paragraph 25
-URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=7&date=2017-03-01&anchor=para_25&doctype=Standard
-URIDate 2017-03-09

+ Details

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

X

- Definition

Disclosure of maturity analysis for derivative financial assets designated at fair value through profit or loss.

+ References

No definition available.

+ Details

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

X

- Details

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

X

- Details

Name:	ifrs-full_PastDueStatusAxis=ifrs-full_CurrentMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	ifrs-full_MaturityAxis=ifrs-full_NotLaterThanOneYearMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	ifrs-full_PastDueStatusAxis=itub_NonCurrentMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	ifrs-full_MaturityAxis=ifrs-full_LaterThanOneYearAndNotLaterThanFiveYearsMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	ifrs-full_MaturityAxis=ifrs-full_LaterThanFiveYearsAndNotLaterThanTenYearsMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	ifrs-full_MaturityAxis=ifrs-full_LaterThanTenYearsMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: