XML 141 R89.htm IDEA: XBRL DOCUMENT
v3.19.1

Derivatives - Summary of Derivative Contracts Maturity (Detail) - BRL (R$) | Dec. 31, 2018 | Dec. 31, 2017
--- | --- | ---
Futures [Member] |  |
Disclosure of maturity analysis for derivative financial liabilities [line items] |  |
Off-balance sheet - notional amount | R$ 586,033,000,000 | R$ 607,980,000,000
Swap [member] |  |
Disclosure of maturity analysis for derivative financial liabilities [line items] |  |
Off-balance sheet - notional amount | 939,510,000,000 | 837,299,000,000
Option contract [member] |  |
Disclosure of maturity analysis for derivative financial liabilities [line items] |  |
Off-balance sheet - notional amount | 1,262,568,000,000 | 1,847,829,000,000
Forward [member] |  |
Disclosure of maturity analysis for derivative financial liabilities [line items] |  |
Off-balance sheet - notional amount | 2,341,000,000 | 9,954,000,000
Credit derivatives [Member] |  |
Disclosure of maturity analysis for derivative financial liabilities [line items] |  |
Off-balance sheet - notional amount | 8,324,000,000 | 10,110,000,000
NDF [Member] |  |
Disclosure of maturity analysis for derivative financial liabilities [line items] |  |
Off-balance sheet - notional amount | 225,355,000,000 | 252,628,000,000
Check of swap [Member] |  |
Disclosure of maturity analysis for derivative financial liabilities [line items] |  |
Off-balance sheet - notional amount | 1,334,000,000 | 955,000,000
Other derivative financial instruments [Member] |  |
Disclosure of maturity analysis for derivative financial liabilities [line items] |  |
Off-balance sheet - notional amount | 5,304,000,000 | 4,225,000,000
0-30 days [Member] | Futures [Member] |  |
Disclosure of maturity analysis for derivative financial liabilities [line items] |  |
Off-balance sheet - notional amount | 217,836,000,000 | 187,771,000,000
0-30 days [Member] | Swap [member] |  |
Disclosure of maturity analysis for derivative financial liabilities [line items] |  |
Off-balance sheet - notional amount | 70,403,000,000 | 37,526,000,000
0-30 days [Member] | Option contract [member] |  |
Disclosure of maturity analysis for derivative financial liabilities [line items] |  |
Off-balance sheet - notional amount | 595,515,000,000 | 418,679,000,000
0-30 days [Member] | Forward [member] |  |
Disclosure of maturity analysis for derivative financial liabilities [line items] |  |
Off-balance sheet - notional amount | 1,412,000,000 | 6,997,000,000
0-30 days [Member] | NDF [Member] |  |
Disclosure of maturity analysis for derivative financial liabilities [line items] |  |
Off-balance sheet - notional amount | 76,032,000,000 | 63,446,000,000
0-30 days [Member] | Other derivative financial instruments [Member] |  |
Disclosure of maturity analysis for derivative financial liabilities [line items] |  |
Off-balance sheet - notional amount | 8,000,000 |
31-180 days [Member] | Futures [Member] |  |
Disclosure of maturity analysis for derivative financial liabilities [line items] |  |
Off-balance sheet - notional amount | 193,637,000,000 | 152,660,000,000
31-180 days [Member] | Swap [member] |  |
Disclosure of maturity analysis for derivative financial liabilities [line items] |  |
Off-balance sheet - notional amount | 96,913,000,000 | 135,791,000,000
31-180 days [Member] | Option contract [member] |  |
Disclosure of maturity analysis for derivative financial liabilities [line items] |  |
Off-balance sheet - notional amount | 131,147,000,000 | 290,491,000,000
31-180 days [Member] | Forward [member] |  |
Disclosure of maturity analysis for derivative financial liabilities [line items] |  |
Off-balance sheet - notional amount | 844,000,000 | 1,933,000,000
31-180 days [Member] | Credit derivatives [Member] |  |
Disclosure of maturity analysis for derivative financial liabilities [line items] |  |
Off-balance sheet - notional amount | 1,188,000,000 | 510,000,000
31-180 days [Member] | NDF [Member] |  |
Disclosure of maturity analysis for derivative financial liabilities [line items] |  |
Off-balance sheet - notional amount | 102,024,000,000 | 136,650,000,000
31-180 days [Member] | Check of swap [Member] |  |
Disclosure of maturity analysis for derivative financial liabilities [line items] |  |
Off-balance sheet - notional amount | 115,000,000 | 293,000,000
31-180 days [Member] | Other derivative financial instruments [Member] |  |
Disclosure of maturity analysis for derivative financial liabilities [line items] |  |
Off-balance sheet - notional amount | 405,000,000 | 474,000,000
181-365 days [Member] | Futures [Member] |  |
Disclosure of maturity analysis for derivative financial liabilities [line items] |  |
Off-balance sheet - notional amount | 33,969,000,000 | 87,819,000,000
181-365 days [Member] | Swap [member] |  |
Disclosure of maturity analysis for derivative financial liabilities [line items] |  |
Off-balance sheet - notional amount | 96,090,000,000 | 115,296,000,000
181-365 days [Member] | Option contract [member] |  |
Disclosure of maturity analysis for derivative financial liabilities [line items] |  |
Off-balance sheet - notional amount | 329,834,000,000 | 457,164,000,000
181-365 days [Member] | Forward [member] |  |
Disclosure of maturity analysis for derivative financial liabilities [line items] |  |
Off-balance sheet - notional amount | 85,000,000 | 1,024,000,000
181-365 days [Member] | Credit derivatives [Member] |  |
Disclosure of maturity analysis for derivative financial liabilities [line items] |  |
Off-balance sheet - notional amount | 680,000,000 | 1,230,000,000
181-365 days [Member] | NDF [Member] |  |
Disclosure of maturity analysis for derivative financial liabilities [line items] |  |
Off-balance sheet - notional amount | 30,212,000,000 | 39,109,000,000
181-365 days [Member] | Other derivative financial instruments [Member] |  |
Disclosure of maturity analysis for derivative financial liabilities [line items] |  |
Off-balance sheet - notional amount | 357,000,000 | 851,000,000
Non-current [Member] | Futures [Member] |  |
Disclosure of maturity analysis for derivative financial liabilities [line items] |  |
Off-balance sheet - notional amount | 140,591,000,000 | 179,730,000,000
Non-current [Member] | Swap [member] |  |
Disclosure of maturity analysis for derivative financial liabilities [line items] |  |
Off-balance sheet - notional amount | 676,104,000,000 | 548,686,000,000
Non-current [Member] | Option contract [member] |  |
Disclosure of maturity analysis for derivative financial liabilities [line items] |  |
Off-balance sheet - notional amount | 206,072,000,000 | 681,495,000,000
Non-current [Member] | Credit derivatives [Member] |  |
Disclosure of maturity analysis for derivative financial liabilities [line items] |  |
Off-balance sheet - notional amount | 6,456,000,000 | 8,370,000,000
Non-current [Member] | NDF [Member] |  |
Disclosure of maturity analysis for derivative financial liabilities [line items] |  |
Off-balance sheet - notional amount | 17,087,000,000 | 13,423,000,000
Non-current [Member] | Check of swap [Member] |  |
Disclosure of maturity analysis for derivative financial liabilities [line items] |  |
Off-balance sheet - notional amount | 1,219,000,000 | 662,000,000
Non-current [Member] | Other derivative financial instruments [Member] |  |
Disclosure of maturity analysis for derivative financial liabilities [line items] |  |
Off-balance sheet - notional amount | R$ 4,534,000,000 | R$ 2,900,000,000

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_DisclosureOfMaturityAnalysisForDerivativeFinancialLiabilitiesLineItems
Namespace Prefix: | ifrs-full_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Aggregate notional amount specified by the derivative(s). Expressed as an absolute value. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Article 12 -Section 13 -Sentence Column B + Details
Name: | invest_DerivativeNotionalAmount
Namespace Prefix: | invest_
Data Type: | xbrli:monetaryItemType
Balance Type: | na
Period Type: | instant

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

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

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

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

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

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

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

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

X
- Details
Name: | ifrs-full_MaturityAxis=ifrs-full_NotLaterThanOneMonthMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_MaturityAxis=ifrs-full_LaterThanOneMonthAndNotLaterThanSixMonthsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_MaturityAxis=ifrs-full_LaterThanSixMonthsAndNotLaterThanOneYearMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_MaturityAxis=ifrs-full_LaterThanOneYearMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |