XML 243 R191.htm IDEA: XBRL DOCUMENT
v3.19.1

Fair Value of Financial Instruments - Summary of Breakdown of Fair Value Hierarchy Levels (Detail) - BRL (R$) R$ in Millions | Dec. 31, 2018 | Dec. 31, 2017 | Jan. 01, 2017 | Dec. 31, 2016
--- | --- | --- | --- | ---
Disclosure of financial assets measured at fair value [line items] |  |  |  |
Financial assets at fair value through profit or loss | R$ 286,646 | R$ 273,536 | R$ 218,805 |
Financial assets at fair value through other comprehensive income | 49,323 | 52,149 | R$ 40,039 |
Financial assets at fair value through profit or loss | 1,269 | 1,746 |  |
Financial liabilities designated at fair value through profit or loss | 192 | 465 |  |
Structured notes [member] |  |  |  |
Disclosure of financial assets measured at fair value [line items] |  |  |  |
Financial liabilities designated at fair value through profit or loss | 192 | 465 |  |
Financial Assets Designated As At Fair Value Through Profit And Loss [Member] |  |  |  |
Disclosure of financial assets measured at fair value [line items] |  |  |  |
Financial assets at fair value through profit or loss | 261,911 | 248,947 |  |
Brazilian government securities [member] |  |  |  |
Disclosure of financial assets measured at fair value [line items] |  |  |  |
Financial assets at fair value through profit or loss | 217,058 | 207,844 |  |
Financial assets at fair value through other comprehensive income | 27,839 | 32,926 |  |
Financial assets at fair value through profit or loss | 1,269 | 1,746 |  |
Government securities - abroad [member] |  |  |  |
Disclosure of financial assets measured at fair value [line items] |  |  |  |
Financial assets at fair value through profit or loss | 2,079 | 3,949 |  |
Financial assets at fair value through other comprehensive income | 18,772 | 16,542 |  |
Government securities - abroad [member] | Argentina [Member] |  |  |  |
Disclosure of financial assets measured at fair value [line items] |  |  |  |
Financial assets at fair value through profit or loss | 1,129 | 1,466 |  |
Government securities - abroad [member] | Chile [member] |  |  |  |
Disclosure of financial assets measured at fair value [line items] |  |  |  |
Financial assets at fair value through profit or loss | 302 | 57 |  |
Financial assets at fair value through other comprehensive income | 7,653 | 9,550 |  |
Government securities - abroad [member] | Colombia [member] |  |  |  |
Disclosure of financial assets measured at fair value [line items] |  |  |  |
Financial assets at fair value through profit or loss | 207 | 2,092 |  |
Financial assets at fair value through other comprehensive income | 5,505 | 3,020 |  |
Government securities - abroad [member] | United States [member] |  |  |  |
Disclosure of financial assets measured at fair value [line items] |  |  |  |
Financial assets at fair value through profit or loss | 117 | 100 |  |
Financial assets at fair value through other comprehensive income | 2,618 | 1,550 |  |
Government securities - abroad [member] | ITALY |  |  |  |
Disclosure of financial assets measured at fair value [line items] |  |  |  |
Financial assets at fair value through profit or loss | 115 |  |  |
Government securities - abroad [member] | Mexico [Member] |  |  |  |
Disclosure of financial assets measured at fair value [line items] |  |  |  |
Financial assets at fair value through profit or loss | 120 | 5 |  |
Government securities - abroad [member] | Paraguay [member] |  |  |  |
Disclosure of financial assets measured at fair value [line items] |  |  |  |
Financial assets at fair value through profit or loss | 1 | 3 |  |
Financial assets at fair value through other comprehensive income | 1,529 | 1,800 |  |
Government securities - abroad [member] | Uruguay [member] |  |  |  |
Disclosure of financial assets measured at fair value [line items] |  |  |  |
Financial assets at fair value through profit or loss | 84 | 193 |  |
Financial assets at fair value through other comprehensive income | 553 | 622 |  |
Government securities - abroad [member] | Other [Member] |  |  |  |
Disclosure of financial assets measured at fair value [line items] |  |  |  |
Financial assets at fair value through profit or loss | 4 | 33 |  |
Financial assets at fair value through other comprehensive income | 1 |  |  |
Government securities - abroad [member] | Germany [member] |  |  |  |
Disclosure of financial assets measured at fair value [line items] |  |  |  |
Financial assets at fair value through other comprehensive income | 22 |  |  |
Government securities - abroad [member] | France [member] |  |  |  |
Disclosure of financial assets measured at fair value [line items] |  |  |  |
Financial assets at fair value through other comprehensive income | 891 |  |  |
Corporate securities [member] |  |  |  |
Disclosure of financial assets measured at fair value [line items] |  |  |  |
Financial assets at fair value through profit or loss | 38,448 | 33,641 |  |
Financial assets at fair value through other comprehensive income | 2,712 | 2,681 |  |
Corporate securities [member] | Shares [Member] |  |  |  |
Disclosure of financial assets measured at fair value [line items] |  |  |  |
Financial assets at fair value through profit or loss | 9,446 | 5,959 |  |
Financial assets at fair value through other comprehensive income | 161 | 148 |  |
Corporate securities [member] | Bank deposit certificates [member] |  |  |  |
Disclosure of financial assets measured at fair value [line items] |  |  |  |
Financial assets at fair value through profit or loss | 969 | 335 |  |
Financial assets at fair value through other comprehensive income | 1,053 | 685 |  |
Corporate securities [member] | Securitized real estate loans [Member] |  |  |  |
Disclosure of financial assets measured at fair value [line items] |  |  |  |
Financial assets at fair value through profit or loss | 1,411 | 1,795 |  |
Corporate securities [member] | Debentures [member] |  |  |  |
Disclosure of financial assets measured at fair value [line items] |  |  |  |
Financial assets at fair value through profit or loss | 4,960 | 3,216 |  |
Financial assets at fair value through other comprehensive income | 2 | 1 |  |
Corporate securities [member] | Eurobonds and others [member] |  |  |  |
Disclosure of financial assets measured at fair value [line items] |  |  |  |
Financial assets at fair value through profit or loss | 1,396 | 688 |  |
Financial assets at fair value through other comprehensive income | 1,496 | 1,847 |  |
Corporate securities [member] | Financial credit bills [member] |  |  |  |
Disclosure of financial assets measured at fair value [line items] |  |  |  |
Financial assets at fair value through profit or loss | 19,724 | 21,170 |  |
Corporate securities [member] | Promissory notes [Member] |  |  |  |
Disclosure of financial assets measured at fair value [line items] |  |  |  |
Financial assets at fair value through profit or loss | 435 | 391 |  |
Corporate securities [member] | Other [Member] |  |  |  |
Disclosure of financial assets measured at fair value [line items] |  |  |  |
Financial assets at fair value through profit or loss | 107 | 87 |  |
Investment funds [member] |  |  |  |
Disclosure of financial assets measured at fair value [line items] |  |  |  |
Financial assets at fair value through profit or loss | 4,326 | 3,513 |  |
Level 1 [Member] |  |  |  |
Disclosure of financial assets measured at fair value [line items] |  |  |  |
Financial assets at fair value through other comprehensive income | 30,680 | 35,234 |  |
Financial assets at fair value through profit or loss | 1,269 | 1,746 |  |
Level 1 [Member] | Financial Assets Designated As At Fair Value Through Profit And Loss [Member] |  |  |  |
Disclosure of financial assets measured at fair value [line items] |  |  |  |
Financial assets at fair value through profit or loss | 224,872 | 213,421 |  |
Level 1 [Member] | Brazilian government securities [member] |  |  |  |
Disclosure of financial assets measured at fair value [line items] |  |  |  |
Financial assets at fair value through profit or loss | 213,816 | 205,027 |  |
Financial assets at fair value through other comprehensive income | 27,038 | 32,218 |  |
Financial assets at fair value through profit or loss | 1,269 | 1,746 |  |
Level 1 [Member] | Government securities - abroad [member] |  |  |  |
Disclosure of financial assets measured at fair value [line items] |  |  |  |
Financial assets at fair value through profit or loss | 1,517 | 1,643 |  |
Financial assets at fair value through other comprehensive income | 2,448 | 1,550 |  |
Level 1 [Member] | Government securities - abroad [member] | Argentina [Member] |  |  |  |
Disclosure of financial assets measured at fair value [line items] |  |  |  |
Financial assets at fair value through profit or loss | 1,129 | 1,466 |  |
Level 1 [Member] | Government securities - abroad [member] | Chile [member] |  |  |  |
Disclosure of financial assets measured at fair value [line items] |  |  |  |
Financial assets at fair value through profit or loss | 147 | 39 |  |
Level 1 [Member] | Government securities - abroad [member] | United States [member] |  |  |  |
Disclosure of financial assets measured at fair value [line items] |  |  |  |
Financial assets at fair value through profit or loss | 117 | 100 |  |
Financial assets at fair value through other comprehensive income | 2,425 | 1,550 |  |
Level 1 [Member] | Government securities - abroad [member] | Mexico [Member] |  |  |  |
Disclosure of financial assets measured at fair value [line items] |  |  |  |
Financial assets at fair value through profit or loss | 120 | 5 |  |
Level 1 [Member] | Government securities - abroad [member] | Other [Member] |  |  |  |
Disclosure of financial assets measured at fair value [line items] |  |  |  |
Financial assets at fair value through profit or loss | 4 | 33 |  |
Financial assets at fair value through other comprehensive income | 1 |  |  |
Level 1 [Member] | Government securities - abroad [member] | Germany [member] |  |  |  |
Disclosure of financial assets measured at fair value [line items] |  |  |  |
Financial assets at fair value through other comprehensive income | 22 |  |  |
Level 1 [Member] | Corporate securities [member] |  |  |  |
Disclosure of financial assets measured at fair value [line items] |  |  |  |
Financial assets at fair value through profit or loss | 7,536 | 5,013 |  |
Financial assets at fair value through other comprehensive income | 1,194 | 1,466 |  |
Level 1 [Member] | Corporate securities [member] | Shares [Member] |  |  |  |
Disclosure of financial assets measured at fair value [line items] |  |  |  |
Financial assets at fair value through profit or loss | 6,175 | 3,875 |  |
Financial assets at fair value through other comprehensive income | 161 | 148 |  |
Level 1 [Member] | Corporate securities [member] | Bank deposit certificates [member] |  |  |  |
Disclosure of financial assets measured at fair value [line items] |  |  |  |
Financial assets at fair value through profit or loss | 1 | 1 |  |
Level 1 [Member] | Corporate securities [member] | Debentures [member] |  |  |  |
Disclosure of financial assets measured at fair value [line items] |  |  |  |
Financial assets at fair value through profit or loss | 168 | 486 |  |
Level 1 [Member] | Corporate securities [member] | Eurobonds and others [member] |  |  |  |
Disclosure of financial assets measured at fair value [line items] |  |  |  |
Financial assets at fair value through profit or loss | 1,192 | 651 |  |
Financial assets at fair value through other comprehensive income | 1,033 | 1,318 |  |
Level 1 [Member] | Investment funds [member] |  |  |  |
Disclosure of financial assets measured at fair value [line items] |  |  |  |
Financial assets at fair value through profit or loss | 2,003 | 1,738 |  |
Level 2 [Member] |  |  |  |
Disclosure of financial assets measured at fair value [line items] |  |  |  |
Financial assets at fair value through other comprehensive income | 18,643 | 16,915 |  |
Financial liabilities designated at fair value through profit or loss | 192 | 465 |  |
Level 2 [Member] | Structured notes [member] |  |  |  |
Disclosure of financial assets measured at fair value [line items] |  |  |  |
Financial liabilities designated at fair value through profit or loss | 192 | 465 |  |
Level 2 [Member] | Financial Assets Designated As At Fair Value Through Profit And Loss [Member] |  |  |  |
Disclosure of financial assets measured at fair value [line items] |  |  |  |
Financial assets at fair value through profit or loss | 34,206 | 31,579 |  |
Level 2 [Member] | Brazilian government securities [member] |  |  |  |
Disclosure of financial assets measured at fair value [line items] |  |  |  |
Financial assets at fair value through profit or loss | 3,242 | 2,816 |  |
Financial assets at fair value through other comprehensive income | 801 | 708 |  |
Level 2 [Member] | Government securities - abroad [member] |  |  |  |
Disclosure of financial assets measured at fair value [line items] |  |  |  |
Financial assets at fair value through profit or loss | 562 | 2,306 |  |
Financial assets at fair value through other comprehensive income | 16,324 | 14,992 |  |
Level 2 [Member] | Government securities - abroad [member] | Chile [member] |  |  |  |
Disclosure of financial assets measured at fair value [line items] |  |  |  |
Financial assets at fair value through profit or loss | 155 | 18 |  |
Financial assets at fair value through other comprehensive income | 7,653 | 9,550 |  |
Level 2 [Member] | Government securities - abroad [member] | Colombia [member] |  |  |  |
Disclosure of financial assets measured at fair value [line items] |  |  |  |
Financial assets at fair value through profit or loss | 207 | 2,092 |  |
Financial assets at fair value through other comprehensive income | 5,505 | 3,020 |  |
Level 2 [Member] | Government securities - abroad [member] | United States [member] |  |  |  |
Disclosure of financial assets measured at fair value [line items] |  |  |  |
Financial assets at fair value through other comprehensive income | 193 |  |  |
Level 2 [Member] | Government securities - abroad [member] | ITALY |  |  |  |
Disclosure of financial assets measured at fair value [line items] |  |  |  |
Financial assets at fair value through profit or loss | 115 |  |  |
Level 2 [Member] | Government securities - abroad [member] | Paraguay [member] |  |  |  |
Disclosure of financial assets measured at fair value [line items] |  |  |  |
Financial assets at fair value through profit or loss | 1 | 3 |  |
Financial assets at fair value through other comprehensive income | 1,529 | 1,800 |  |
Level 2 [Member] | Government securities - abroad [member] | Uruguay [member] |  |  |  |
Disclosure of financial assets measured at fair value [line items] |  |  |  |
Financial assets at fair value through profit or loss | 84 | 193 |  |
Financial assets at fair value through other comprehensive income | 553 | 622 |  |
Level 2 [Member] | Government securities - abroad [member] | France [member] |  |  |  |
Disclosure of financial assets measured at fair value [line items] |  |  |  |
Financial assets at fair value through other comprehensive income | 891 |  |  |
Level 2 [Member] | Corporate securities [member] |  |  |  |
Disclosure of financial assets measured at fair value [line items] |  |  |  |
Financial assets at fair value through profit or loss | 28,079 | 24,682 |  |
Financial assets at fair value through other comprehensive income | 1,518 | 1,215 |  |
Level 2 [Member] | Corporate securities [member] | Shares [Member] |  |  |  |
Disclosure of financial assets measured at fair value [line items] |  |  |  |
Financial assets at fair value through profit or loss | 2,003 | 65 |  |
Level 2 [Member] | Corporate securities [member] | Bank deposit certificates [member] |  |  |  |
Disclosure of financial assets measured at fair value [line items] |  |  |  |
Financial assets at fair value through profit or loss | 968 | 334 |  |
Financial assets at fair value through other comprehensive income | 1,053 | 685 |  |
Level 2 [Member] | Corporate securities [member] | Debentures [member] |  |  |  |
Disclosure of financial assets measured at fair value [line items] |  |  |  |
Financial assets at fair value through profit or loss | 4,707 | 2,608 |  |
Financial assets at fair value through other comprehensive income | 2 | 1 |  |
Level 2 [Member] | Corporate securities [member] | Eurobonds and others [member] |  |  |  |
Disclosure of financial assets measured at fair value [line items] |  |  |  |
Financial assets at fair value through profit or loss | 173 | 37 |  |
Financial assets at fair value through other comprehensive income | 463 | 529 |  |
Level 2 [Member] | Corporate securities [member] | Financial credit bills [member] |  |  |  |
Disclosure of financial assets measured at fair value [line items] |  |  |  |
Financial assets at fair value through profit or loss | 19,719 | 21,170 |  |
Level 2 [Member] | Corporate securities [member] | Promissory notes [Member] |  |  |  |
Disclosure of financial assets measured at fair value [line items] |  |  |  |
Financial assets at fair value through profit or loss | 435 | 391 |  |
Level 2 [Member] | Corporate securities [member] | Other [Member] |  |  |  |
Disclosure of financial assets measured at fair value [line items] |  |  |  |
Financial assets at fair value through profit or loss | 74 | 77 |  |
Level 2 [Member] | Investment funds [member] |  |  |  |
Disclosure of financial assets measured at fair value [line items] |  |  |  |
Financial assets at fair value through profit or loss | 2,323 | 1,775 |  |
Level 3 [Member] |  |  |  |
Disclosure of financial assets measured at fair value [line items] |  |  |  |
Financial assets at fair value through profit or loss |  | 3,947 |  |
Financial assets at fair value through other comprehensive income |  |  |  | R$ (227)
Level 3 [Member] | Financial Assets Designated As At Fair Value Through Profit And Loss [Member] |  |  |  |
Disclosure of financial assets measured at fair value [line items] |  |  |  |
Financial assets at fair value through profit or loss | 2,833 | 3,947 |  |
Level 3 [Member] | Brazilian government securities [member] |  |  |  |
Disclosure of financial assets measured at fair value [line items] |  |  |  |
Financial assets at fair value through profit or loss |  | 1 |  |
Level 3 [Member] | Corporate securities [member] |  |  |  |
Disclosure of financial assets measured at fair value [line items] |  |  |  |
Financial assets at fair value through profit or loss | 2,833 | 3,946 |  |
Financial assets at fair value through other comprehensive income |  |  |  | (227)
Level 3 [Member] | Corporate securities [member] | Shares [Member] |  |  |  |
Disclosure of financial assets measured at fair value [line items] |  |  |  |
Financial assets at fair value through profit or loss | 1,268 | 2,019 |  |
Level 3 [Member] | Corporate securities [member] | Securitized real estate loans [Member] |  |  |  |
Disclosure of financial assets measured at fair value [line items] |  |  |  |
Financial assets at fair value through profit or loss | 1,411 | 1,795 |  |
Financial assets at fair value through other comprehensive income |  |  |  | (6)
Level 3 [Member] | Corporate securities [member] | Debentures [member] |  |  |  |
Disclosure of financial assets measured at fair value [line items] |  |  |  |
Financial assets at fair value through profit or loss | 85 | 122 |  |
Level 3 [Member] | Corporate securities [member] | Eurobonds and others [member] |  |  |  |
Disclosure of financial assets measured at fair value [line items] |  |  |  |
Financial assets at fair value through profit or loss | 31 |  |  |
Financial assets at fair value through other comprehensive income |  |  |  | R$ (221)
Level 3 [Member] | Corporate securities [member] | Financial credit bills [member] |  |  |  |
Disclosure of financial assets measured at fair value [line items] |  |  |  |
Financial assets at fair value through profit or loss | 5 |  |  |
Level 3 [Member] | Corporate securities [member] | Other [Member] |  |  |  |
Disclosure of financial assets measured at fair value [line items] |  |  |  |
Financial assets at fair value through profit or loss | R$ 33 | R$ 10 |  |

X
- Definition The amount of current financial assets measured at fair value through profit or loss. [Refer: Financial assets at fair value through profit or loss] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 7 -IssueDate 2017-01-01 -Paragraph 8 -Subparagraph a -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=7&date=2017-03-01&anchor=para_8_a&doctype=Standard -URIDate 2017-03-09 + Details
Name: | ifrs-full_CurrentFinancialAssetsAtFairValueThroughProfitOrLoss
Namespace Prefix: | ifrs-full_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition The amount of financial assets at fair value through other comprehensive income. [Refer: At fair value [member]; Financial assets; Other comprehensive income] + 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 h -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=7&date=2017-03-01&anchor=para_8_h&doctype=Standard -URIDate 2017-03-09 + Details
Name: | ifrs-full_FinancialAssetsAtFairValueThroughOtherComprehensiveIncome
Namespace Prefix: | ifrs-full_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition The amount of financial assets that are measured at fair value and for which gains (losses) are recognised in profit or loss. A financial asset shall be measured at fair value through profit or loss unless it is measured at amortised cost or at fair value through other comprehensive income. A gain (loss) on a financial asset measured at fair value shall be recognised in profit or loss unless it is part of a hedging relationship, it is an investment in an equity instrument for which the entity has elected to present gains and losses in other comprehensive income or it is a financial asset measured at fair value through other comprehensive income. [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 8 -Subparagraph a -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=7&date=2017-03-01&anchor=para_8_a&doctype=Standard -URIDate 2017-03-09 + Details
Name: | ifrs-full_FinancialAssetsAtFairValueThroughProfitOrLoss
Namespace Prefix: | ifrs-full_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Disclosure of financial assets measured at fair value [line items] + References No definition available. + Details
Name: | itub_DisclosureOfFinancialAssetsMeasuredAtFairValueLineItems
Namespace Prefix: | itub_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Financial Liabilities Designated At Fair Value Through Profit Or Loss + References No definition available. + Details
Name: | itub_FinancialLiabilitiesDesignatedAtFairValueThroughProfitOrLoss
Namespace Prefix: | itub_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Details
Name: | ifrs-full_CategoriesOfFinancialLiabilitiesAxis=itub_StructuredNotesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_CategoriesOfFinancialAssetsAxis=itub_FinancialAssetsDesignatedAsAtFairValueThroughProfitAndLossMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_CategoriesOfFinancialAssetsAxis=itub_BrazilianGovernmentSecuritiesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_CategoriesOfFinancialAssetsAxis=itub_GovernmentSecuritiesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_GeographicalAreasAxis=country_AR
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_GeographicalAreasAxis=country_CL
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_GeographicalAreasAxis=country_CO
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_GeographicalAreasAxis=country_US
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_GeographicalAreasAxis=country_IT
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_GeographicalAreasAxis=country_MX
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_GeographicalAreasAxis=country_PY
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_GeographicalAreasAxis=country_UY
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_GeographicalAreasAxis=itub_AllOtherCountriesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_GeographicalAreasAxis=country_DE
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_GeographicalAreasAxis=country_FR
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_CategoriesOfFinancialAssetsAxis=itub_CorporateSecuritiesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_ClassesOfFinancialAssetsAxis=ifrs-full_EquityInvestmentsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_ClassesOfFinancialAssetsAxis=itub_BankDepositCertificatesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_ClassesOfFinancialAssetsAxis=itub_SecuritizedRealEstateLoansMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_ClassesOfFinancialAssetsAxis=itub_DebenturesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_ClassesOfFinancialAssetsAxis=itub_EurobondsAndOthersMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_ClassesOfFinancialAssetsAxis=itub_FinancialCreditBillsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_ClassesOfFinancialAssetsAxis=itub_PromissoryNotesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_ClassesOfFinancialAssetsAxis=itub_OtherSecuritiesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_UnconsolidatedStructuredEntitiesAxis=ifrs-full_InvestmentFundsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_LevelsOfFairValueHierarchyAxis=ifrs-full_Level1OfFairValueHierarchyMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_LevelsOfFairValueHierarchyAxis=ifrs-full_Level2OfFairValueHierarchyMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_LevelsOfFairValueHierarchyAxis=ifrs-full_Level3OfFairValueHierarchyMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |