XML 133 R101.htm IDEA: XBRL DOCUMENT
v3.20.1

Financial Assets at Fair Value Through Other Comprehensive Income-Securities - Summary of Fair Value and Corresponding Gross Carrying Amount of Financial Assets at Fair Value Through Other Comprehensive Income-Securities Assets (Detail) - BRL (R$) R$ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2019 | Dec. 31, 2018
Disclosure of fair value of investments in equity instruments designated at fair value through other comprehensive income [line items] |  |
Gross carrying amount | R$ 74,700 | R$ 48,663
Fair value adjustments (in stockholders' equity) | 2,046 | 745
Expected loss | (86) | (85)
Fair value | 76,660 | 49,323
Brazilian government securities [member] |  |
Disclosure of fair value of investments in equity instruments designated at fair value through other comprehensive income [line items] |  |
Gross carrying amount | 48,718 | 27,064
Fair value adjustments (in stockholders' equity) | 2,014 | 775
Fair value | 50,732 | 27,839
Government securities - abroad [member] |  |
Disclosure of fair value of investments in equity instruments designated at fair value through other comprehensive income [line items] |  |
Gross carrying amount | 20,638 | 18,844
Fair value adjustments (in stockholders' equity) | (64) | (70)
Expected loss | (3) | (2)
Fair value | 20,571 | 18,772
Corporate debt securities [member] |  |
Disclosure of fair value of investments in equity instruments designated at fair value through other comprehensive income [line items] |  |
Gross carrying amount | 5,308 | 2,719
Fair value adjustments (in stockholders' equity) | 96 | 40
Expected loss | (47) | (47)
Fair value | 5,357 | 2,712
Germany [member] | Government securities - abroad [member] |  |
Disclosure of fair value of investments in equity instruments designated at fair value through other comprehensive income [line items] |  |
Gross carrying amount | 23 | 22
Fair value | 23 | 22
Colombia [member] | Government securities - abroad [member] |  |
Disclosure of fair value of investments in equity instruments designated at fair value through other comprehensive income [line items] |  |
Gross carrying amount | 3,851 | 5,491
Fair value adjustments (in stockholders' equity) | 27 | 14
Fair value | 3,878 | 5,505
Chile [member] | Government securities - abroad [member] |  |
Disclosure of fair value of investments in equity instruments designated at fair value through other comprehensive income [line items] |  |
Gross carrying amount | 11,119 | 7,647
Fair value adjustments (in stockholders' equity) | 89 | 7
Expected loss |  | (1)
Fair value | 11,208 | 7,653
United States [member] | Government securities - abroad [member] |  |
Disclosure of fair value of investments in equity instruments designated at fair value through other comprehensive income [line items] |  |
Gross carrying amount | 2,758 | 2,634
Fair value adjustments (in stockholders' equity) | (2) | (16)
Fair value | 2,756 | 2,618
Italy [member] | Government securities - abroad [member] |  |
Disclosure of fair value of investments in equity instruments designated at fair value through other comprehensive income [line items] |  |
Gross carrying amount | 328 |
Fair value adjustments (in stockholders' equity) | 1 |
Fair value | 329 |
France [member] | Government securities - abroad [member] |  |
Disclosure of fair value of investments in equity instruments designated at fair value through other comprehensive income [line items] |  |
Gross carrying amount |  | 891
Fair value |  | 891
Paraguay [member] | Government securities - abroad [member] |  |
Disclosure of fair value of investments in equity instruments designated at fair value through other comprehensive income [line items] |  |
Gross carrying amount | 1,957 | 1,601
Fair value adjustments (in stockholders' equity) | (174) | (71)
Expected loss | (3) | (1)
Fair value | 1,780 | 1,529
Uruguay [member] | Government securities - abroad [member] |  |
Disclosure of fair value of investments in equity instruments designated at fair value through other comprehensive income [line items] |  |
Gross carrying amount | 602 | 557
Fair value adjustments (in stockholders' equity) | (5) | (4)
Fair value | 597 | 553
Other foreign countries [member] | Government securities - abroad [member] |  |
Disclosure of fair value of investments in equity instruments designated at fair value through other comprehensive income [line items] |  |
Gross carrying amount | 3 | 1
Fair value | 0 | 1
Other [member] | Brazilian government securities [member] |  |
Disclosure of fair value of investments in equity instruments designated at fair value through other comprehensive income [line items] |  |
Gross carrying amount | 36 |
Expected loss | (36) | (36)
Other [member] | Government securities - abroad [member] |  |
Disclosure of fair value of investments in equity instruments designated at fair value through other comprehensive income [line items] |  |
Gross carrying amount |  | 36
Other [member] | Corporate debt securities [member] |  |
Disclosure of fair value of investments in equity instruments designated at fair value through other comprehensive income [line items] |  |
Gross carrying amount |  | 3
Expected loss | (3) | (3)
Bank deposit certificates [member] | Corporate debt securities [member] |  |
Disclosure of fair value of investments in equity instruments designated at fair value through other comprehensive income [line items] |  |
Gross carrying amount | 2,371 | 1,053
Fair value | 2,371 | 1,053
Debentures [member] | Corporate debt securities [member] |  |
Disclosure of fair value of investments in equity instruments designated at fair value through other comprehensive income [line items] |  |
Gross carrying amount | 387 | 44
Fair value adjustments (in stockholders' equity) | (10) |
Expected loss | (43) | (42)
Fair value | 334 | 2
Eurobonds and others [member] | Corporate debt securities [member] |  |
Disclosure of fair value of investments in equity instruments designated at fair value through other comprehensive income [line items] |  |
Gross carrying amount | 2,439 | 1,542
Fair value adjustments (in stockholders' equity) | 39 | (44)
Expected loss | (1) | (2)
Fair value | 2,477 | 1,496
Negotiable shares [member] | Corporate debt securities [member] |  |
Disclosure of fair value of investments in equity instruments designated at fair value through other comprehensive income [line items] |  |
Gross carrying amount | 83 | 77
Fair value adjustments (in stockholders' equity) | 66 | 84
Fair value | 149 | R$ 161
Real Estate Receivables Certificates [Member] | Corporate debt securities [member] |  |
Disclosure of fair value of investments in equity instruments designated at fair value through other comprehensive income [line items] |  |
Gross carrying amount | 25 |
Fair value adjustments (in stockholders' equity) | 1 |
Fair value | R$ 26 |

X
- Definition Line items represent concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes of the table. + References No definition available. + Details
Name: | ifrs-full_DisclosureOfFairValueOfInvestmentsInEquityInstrumentsDesignatedAsMeasuredAtFairValueThroughOtherComprehensiveIncomeLineItems
Namespace Prefix: | ifrs-full_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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 -Name IFRS -Number 7 -IssueDate 2019-01-01 -Paragraph 8 -Subparagraph h -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=7&code=ifrs-tx-2019-en-r&anchor=para_8_h&doctype=Standard -URIDate 2019-03-27 + Details
Name: | ifrs-full_FinancialAssetsAtFairValueThroughOtherComprehensiveIncome
Namespace Prefix: | ifrs-full_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Financial assets at cost through other comprehensive income, securities. + References No definition available. + Details
Name: | itub_FinancialAssetsAtCostThroughOtherComprehensiveIncomeSecurities
Namespace Prefix: | itub_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Financial assets at fair value adjustments through other comprehensive income, securities. + References No definition available. + Details
Name: | itub_FinancialAssetsAtFairValueAdjustmentsThroughOtherComprehensiveIncomeSecurities
Namespace Prefix: | itub_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Gains (losses) on financial assets measured at fair value through other comprehensive income, securities. + References No definition available. + Details
Name: | itub_GainsLossesOnFinancialAssetsMeasuredAtFairValueThroughOtherComprehensiveIncomeSecurities
Namespace Prefix: | itub_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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

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

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

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

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

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

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

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

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

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

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

X
- Details
Name: | itub_CountryNameAxis=itub_OtherForeignCountriesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_ClassesOfFinancialInstrumentsAxis=itub_OtherMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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

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

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

X
- Details
Name: | ifrs-full_ClassesOfFinancialInstrumentsAxis=itub_NegotiableSharesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_ClassesOfFinancialInstrumentsAxis=itub_RealEstateReceivablesCertificatesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |