XML 157 R105.htm IDEA: XBRL DOCUMENT
v3.19.1

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, 2018 | Dec. 31, 2017 | Jan. 01, 2017
Disclosure of fair value of investments in equity instruments designated at fair value through other comprehensive income [line items] |  |  |
Gross carrying amount | R$ 48,663 | R$ 51,208 |
Fair value adjustments (in stockholders' equity) | 745 | 1,025 |
Expected loss | (85) | (84) |
Fair value | 49,323 | 52,149 | R$ 40,039
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 | 27,064 | 31,933 |
Fair value adjustments (in stockholders' equity) | 775 | 993 |
Fair value | 27,839 | 32,926 |
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 | 18,844 | 16,583 |
Fair value adjustments (in stockholders' equity) | (70) | (41) |
Expected loss | (2) |  |
Fair value | 18,772 | 16,542 |
Corporate securities [member] |  |  |
Disclosure of fair value of investments in equity instruments designated at fair value through other comprehensive income [line items] |  |  |
Gross carrying amount | 2,719 | 2,656 |
Fair value adjustments (in stockholders' equity) | 40 | 73 |
Expected loss | (47) | (48) |
Fair value | 2,712 | 2,681 |
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 | 22 |  |
Fair value | 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 | 5,491 | 2,928 |
Fair value adjustments (in stockholders' equity) | 14 | 92 |
Fair value | 5,505 | 3,020 |
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 | 7,647 | 9,554 |
Fair value adjustments (in stockholders' equity) | 7 | (4) |
Expected loss | (1) |  |
Fair value | 7,653 | 9,550 |
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 | 2,634 | 1,568 |
Fair value adjustments (in stockholders' equity) | (16) | (18) |
Fair value | 2,618 | 1,550 |
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 | 1,601 | 1,915 |
Fair value adjustments (in stockholders' equity) | (71) | (115) |
Expected loss | (1) |  |
Fair value | 1,529 | 1,800 |
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 | 557 | 618 |
Fair value adjustments (in stockholders' equity) | (4) | 4 |
Fair value | 553 | 622 |
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 | 1 |  |
Fair value | 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 | 36 |
Expected loss | (36) | (36) |
Other [member] | Corporate 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 | 3 |
Expected loss | (3) | (3) |
Shares [member] | Corporate securities [member] |  |  |
Disclosure of fair value of investments in equity instruments designated at fair value through other comprehensive income [line items] |  |  |
Gross carrying amount | 77 | 73 |
Fair value adjustments (in stockholders' equity) | 84 | 75 |
Fair value | 161 | 148 |
Bank deposit certificates [member] | Corporate securities [member] |  |  |
Disclosure of fair value of investments in equity instruments designated at fair value through other comprehensive income [line items] |  |  |
Gross carrying amount | 1,053 | 685 |
Fair value | 1,053 | 685 |
Debentures [member] | Corporate securities [member] |  |  |
Disclosure of fair value of investments in equity instruments designated at fair value through other comprehensive income [line items] |  |  |
Gross carrying amount | 44 | 44 |
Expected loss | (42) | (43) |
Fair value | 2 | 1 |
Eurobonds and others [member] | Corporate securities [member] |  |  |
Disclosure of fair value of investments in equity instruments designated at fair value through other comprehensive income [line items] |  |  |
Gross carrying amount | 1,542 | 1,851 |
Fair value adjustments (in stockholders' equity) | (44) | (2) |
Expected loss | (2) | (2) |
Fair value | R$ 1,496 | R$ 1,847 |

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 -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 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_CorporateSecuritiesMember
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_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_SharesMember
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: |