XML 138 R126.htm IDEA: XBRL DOCUMENT
v3.20.1

Lease - Leasee - Additional Information (Detail) R$ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2019 BRL (R$)
Presentation of leases for lessee [abstract] |
Cash outflow for lease | R$ 1,216
Leases renewed | 579
Impairemnt for leases | R$ (175)

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- Definition The cash outflow for leases. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 16 -IssueDate 2019-01-01 -Paragraph 53 -Subparagraph g -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=16&code=ifrs-tx-2019-en-r&anchor=para_53_g&doctype=Standard -URIDate 2019-03-27 + Details
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Namespace Prefix: | ifrs-full_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- References No definition available. + Details
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Namespace Prefix: | ifrs-full_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition Cash paid in leases renewed. + References No definition available. + Details
Name: | itub_CashPaidInLeasesRenewed
Namespace Prefix: | itub_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Definition Imapairment loss on lease assets. + References No definition available. + Details
Name: | itub_ImapairmentLossOnLeaseAssets
Namespace Prefix: | itub_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration