XML 151 R205.htm IDEA: XBRL DOCUMENT
v3.20.1

Risk and Capital Management - Summary of Financial Assets Individually Evaluated Classified by Rating (Detail) - BRL (R$) | 12 Months Ended
--- | ---
Dec. 31, 2019 | Dec. 31, 2018
Disclosure of financial assets individually evaluated classified by rating [Line Items] |  |
Other financial assets, individually evaluated, classified by rating | R$ 765,719,000,000 | R$ 752,920,000,000
Other financial assets, individually evaluated, classified by rating, percentage | 100.00% | 100.00%
Low [Member] |  |
Disclosure of financial assets individually evaluated classified by rating [Line Items] |  |
Other financial assets, individually evaluated, classified by rating | R$ 758,517,000,000 | R$ 743,932,000,000
Medium [Member] |  |
Disclosure of financial assets individually evaluated classified by rating [Line Items] |  |
Other financial assets, individually evaluated, classified by rating | 4,673,000,000 | 4,985,000,000
High [Member] |  |
Disclosure of financial assets individually evaluated classified by rating [Line Items] |  |
Other financial assets, individually evaluated, classified by rating | 2,529,000,000 | 4,003,000,000
Interbank deposits and securities purchased under agreements to resell [Member] |  |
Disclosure of financial assets individually evaluated classified by rating [Line Items] |  |
Other financial assets, individually evaluated, classified by rating | R$ 233,011,000,000 | R$ 306,556,000,000
Other financial assets, individually evaluated, classified by rating, percentage | 30.40% | 40.60%
Interbank deposits and securities purchased under agreements to resell [Member] | Low [Member] |  |
Disclosure of financial assets individually evaluated classified by rating [Line Items] |  |
Other financial assets, individually evaluated, classified by rating | R$ 233,011,000,000 | R$ 306,556,000,000
Interbank deposits and securities purchased under agreements to resell [Member] | Medium [Member] |  |
Disclosure of financial assets individually evaluated classified by rating [Line Items] |  |
Other financial assets, individually evaluated, classified by rating | 0 |
Interbank deposits and securities purchased under agreements to resell [Member] | High [Member] |  |
Disclosure of financial assets individually evaluated classified by rating [Line Items] |  |
Other financial assets, individually evaluated, classified by rating | 0 |
Financial assets at fair value through profit or loss [member] |  |
Disclosure of financial assets individually evaluated classified by rating [Line Items] |  |
Other financial assets, individually evaluated, classified by rating | R$ 133,119,000,000 | R$ 110,395,000,000
Other financial assets, individually evaluated, classified by rating, percentage | 17.40% | 14.70%
Financial assets at fair value through profit or loss [member] | Low [Member] |  |
Disclosure of financial assets individually evaluated classified by rating [Line Items] |  |
Other financial assets, individually evaluated, classified by rating | R$ 127,251,000,000 | R$ 103,157,000,000
Financial assets at fair value through profit or loss [member] | Medium [Member] |  |
Disclosure of financial assets individually evaluated classified by rating [Line Items] |  |
Other financial assets, individually evaluated, classified by rating | 3,721,000,000 | 3,645,000,000
Financial assets at fair value through profit or loss [member] | High [Member] |  |
Disclosure of financial assets individually evaluated classified by rating [Line Items] |  |
Other financial assets, individually evaluated, classified by rating | 2,147,000,000 | 3,593,000,000
Financial assets designated at fair value through profit or loss [member] |  |
Disclosure of financial assets individually evaluated classified by rating [Line Items] |  |
Other financial assets, individually evaluated, classified by rating | R$ 322,929,000,000 | R$ 286,646,000,000
Other financial assets, individually evaluated, classified by rating, percentage | 42.20% | 38.10%
Financial assets designated at fair value through profit or loss [member] | Low [Member] |  |
Disclosure of financial assets individually evaluated classified by rating [Line Items] |  |
Other financial assets, individually evaluated, classified by rating | R$ 321,595,000,000 | R$ 284,896,000,000
Financial assets designated at fair value through profit or loss [member] | Medium [Member] |  |
Disclosure of financial assets individually evaluated classified by rating [Line Items] |  |
Other financial assets, individually evaluated, classified by rating | 952,000,000 | 1,340,000,000
Financial assets designated at fair value through profit or loss [member] | High [Member] |  |
Disclosure of financial assets individually evaluated classified by rating [Line Items] |  |
Other financial assets, individually evaluated, classified by rating | 382,000,000 | 410,000,000
Available-for-sale financial assets [Member] |  |
Disclosure of financial assets individually evaluated classified by rating [Line Items] |  |
Other financial assets, individually evaluated, classified by rating | R$ 76,660,000,000 | R$ 49,323,000,000
Other financial assets, individually evaluated, classified by rating, percentage | 10.00% | 6.60%
Available-for-sale financial assets [Member] | Low [Member] |  |
Disclosure of financial assets individually evaluated classified by rating [Line Items] |  |
Other financial assets, individually evaluated, classified by rating | R$ 76,660,000,000 | R$ 49,323,000,000
Available-for-sale financial assets [Member] | Medium [Member] |  |
Disclosure of financial assets individually evaluated classified by rating [Line Items] |  |
Other financial assets, individually evaluated, classified by rating | 0 |
Available-for-sale financial assets [Member] | High [Member] |  |
Disclosure of financial assets individually evaluated classified by rating [Line Items] |  |
Other financial assets, individually evaluated, classified by rating | R$ 0 |

X
- Definition Disclosure of financial assets individually evaluated classified by rating. + References No definition available. + Details
Name: | itub_DisclosureOfFinancialAssetsIndividuallyEvaluatedClassifiedByRatingLineItems
Namespace Prefix: | itub_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Maximum exposure of other financial assets. + References No definition available. + Details
Name: | itub_MaximumExposureOfOtherFinancialAssets
Namespace Prefix: | itub_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Percentage of maximum exposure of other financial assets. + References No definition available. + Details
Name: | itub_PercentageOfMaximumExposureOfOtherFinancialAssets
Namespace Prefix: | itub_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

X
- Details
Name: | ifrs-full_InternalCreditGradesAxis=itub_LowerRiskMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_InternalCreditGradesAxis=itub_SatisfactoryRiskMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_InternalCreditGradesAxis=itub_HigherRiskMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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

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

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

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