XML 252 R217.htm IDEA: XBRL DOCUMENT
v3.20.1

Risk and Capital Management - Summary of Composition of the Referential Equity (Detail) - BRL (R$) R$ in Millions | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
--- | --- | --- | --- | ---
Disclosure of regulatory capital [Line Items] |  |  |  |
Stockholders' equity attributable to controlling interests | R$ 136,925 | R$ 136,782 |  |
Non-controllinginterests | 12,540 | 13,684 |  |
Total stockholders' equity | 149,465 | 150,466 | R$ 144,356 | R$ 132,384
Common Equity Tier I | 117,328 | 123,358 |  |
Additional Tier I Capital | 11,368 | 7,796 |  |
Tier I (Common Equity Tier I + Additional Tier I Capital) | 128,696 | 131,154 |  |
Tier II | 11,900 | 15,874 |  |
Referential Equity (Tier I + Tier II) | 140,596 | 147,028 |  |
Referential equity (tier I + tier II) [member] |  |  |  |
Disclosure of regulatory capital [Line Items] |  |  |  |
Stockholders' equity attributable to controlling interests | 131,987 | 131,757 |  |
Non-controllinginterests | 11,110 | 12,276 |  |
Change in interest in subsidiaries in a capital transaction | 259 | 98 |  |
Total stockholders' equity | 143,356 | 144,131 |  |
Common Equity Tier I Prudential Adjustments | (26,028) | (20,773) |  |
Common Equity Tier I | 117,328 | 123,358 |  |
Instruments Eligible to Comprise Additional Tier I | 11,266 | 7,701 |  |
Additional Tier I Prudential Adjustments | 102 | 95 |  |
Additional Tier I Capital | 11,368 | 7,796 |  |
Tier I (Common Equity Tier I + Additional Tier I Capital) | 128,696 | 131,154 |  |
Instruments Eligible to Comprise Tier II | 11,833 | 15,778 |  |
Tier II Prudential Adjustments | 67 | 96 |  |
Tier II | 11,900 | 15,874 |  |
Referential Equity (Tier I + Tier II) | R$ 140,596 | R$ 147,028 |  |

X
- Definition The amount of residual interest in the assets of the entity after deducting all its liabilities. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 1 -IssueDate 2019-01-01 -Paragraph 24 -Subparagraph a -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=1&code=ifrs-tx-2019-en-r&anchor=para_24_a&doctype=Standard -URIDate 2019-03-27 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 1 -IssueDate 2019-01-01 -Paragraph 32 -Subparagraph a -Clause i -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=1&code=ifrs-tx-2019-en-r&anchor=para_32_a_i&doctype=Standard -URIDate 2019-03-27 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 13 -IssueDate 2019-01-01 -Paragraph 93 -Subparagraph a -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=13&code=ifrs-tx-2019-en-r&anchor=para_93_a&doctype=Standard -URIDate 2019-03-27 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 13 -IssueDate 2019-01-01 -Paragraph 93 -Subparagraph b -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=13&code=ifrs-tx-2019-en-r&anchor=para_93_b&doctype=Standard -URIDate 2019-03-27 Reference 5: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 13 -IssueDate 2019-01-01 -Paragraph 93 -Subparagraph e -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=13&code=ifrs-tx-2019-en-r&anchor=para_93_e&doctype=Standard -URIDate 2019-03-27 Reference 6: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 1 -IssueDate 2019-01-01 -Paragraph 55 -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=1&code=ifrs-tx-2019-en-r&anchor=para_55&doctype=Standard -URIDate 2019-03-27 Reference 7: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 1 -IssueDate 2019-01-01 -Paragraph 78 -Subparagraph e -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=1&code=ifrs-tx-2019-en-r&anchor=para_78_e&doctype=Standard -URIDate 2019-03-27 + Details
Name: | ifrs-full_Equity
Namespace Prefix: | ifrs-full_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition The amount of equity attributable to the owners of the parent. This specifically excludes non-controlling interest. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 1 -IssueDate 2019-01-01 -Paragraph 54 -Subparagraph r -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=1&code=ifrs-tx-2019-en-r&anchor=para_54_r&doctype=Standard -URIDate 2019-03-27 + Details
Name: | ifrs-full_EquityAttributableToOwnersOfParent
Namespace Prefix: | ifrs-full_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition The amount of equity in a subsidiary not attributable, directly or indirectly, to a parent. [Refer: Subsidiaries [member]] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 12 -IssueDate 2019-01-01 -Paragraph 12 -Subparagraph f -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=12&code=ifrs-tx-2019-en-r&anchor=para_12_f&doctype=Standard -URIDate 2019-03-27 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 1 -IssueDate 2019-01-01 -Paragraph 54 -Subparagraph q -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=1&code=ifrs-tx-2019-en-r&anchor=para_54_q&doctype=Standard -URIDate 2019-03-27 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 10 -IssueDate 2019-01-01 -Paragraph 22 -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=10&code=ifrs-tx-2019-en-r&anchor=para_22&doctype=Standard -URIDate 2019-03-27 + Details
Name: | ifrs-full_NoncontrollingInterests
Namespace Prefix: | ifrs-full_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Additional Tier One Capital + References No definition available. + Details
Name: | itub_AdditionalTierOneCapital
Namespace Prefix: | itub_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Additional tier one prudential adjustments. + References No definition available. + Details
Name: | itub_AdditionalTierOnePrudentialAdjustments
Namespace Prefix: | itub_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Changes in subsidiaries interests in capital transactions. + References No definition available. + Details
Name: | itub_ChangesInSubsidiariesInterestsInCapitalTransactions
Namespace Prefix: | itub_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Common equity tier one capital amount + References No definition available. + Details
Name: | itub_CommonEquityTierOneCapitalAmount
Namespace Prefix: | itub_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Common equity tier one prudential adjustments. + References No definition available. + Details
Name: | itub_CommonEquityTierOnePrudentialAdjustments
Namespace Prefix: | itub_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Disclosure of regulatory capital [Line Items] + References No definition available. + Details
Name: | itub_DisclosureOfRegulatoryCapitalLineItems
Namespace Prefix: | itub_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Instruments eligible to comprise additional tier. + References No definition available. + Details
Name: | itub_InstrumentsEligibleToCompriseAdditionalTier1
Namespace Prefix: | itub_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Instruments eligible to comprise tier two capital. + References No definition available. + Details
Name: | itub_InstrumentsEligibleToCompriseTierTwoCapital
Namespace Prefix: | itub_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Referential equity. + References No definition available. + Details
Name: | itub_ReferentialEquity
Namespace Prefix: | itub_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Tier one common equity tier one and additional tier one capital. + References No definition available. + Details
Name: | itub_TierOneCommonEquityTierOneAndAdditionalTierOneCapital
Namespace Prefix: | itub_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Tier two capital. + References No definition available. + Details
Name: | itub_TierTwoCapital
Namespace Prefix: | itub_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Tier two capital prudential adjustments. + References No definition available. + Details
Name: | itub_TierTwoCapitalPrudentialAdjustments
Namespace Prefix: | itub_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Details
Name: | ifrs-full_ComponentsOfEquityAxis=itub_ReferentialEquityMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |