XML 268 R216.htm IDEA: XBRL DOCUMENT
v3.19.1

Risk and Capital Management - Summary of Collateral Held for Loan and Lease Operations Portfolio (Detail) - BRL (R$) R$ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2018 | Dec. 31, 2017
Disclosure of collateral held for loan and lease operations portfolio [Line Items] |  |
Carrying value of the assets | R$ 287,444 | R$ 273,764
Fair value of collateral | 685,961 | 647,375
Carrying value of the assets | 26,166 | 22,373
Fair value of collateral | 15,018 | 13,163
Small and medium businesses [member] |  |
Disclosure of collateral held for loan and lease operations portfolio [Line Items] |  |
Carrying value of the assets | 112,508 | 115,731
Fair value of collateral | 293,724 | 339,892
Carrying value of the assets | 13,870 | 11,032
Fair value of collateral | 10,267 | 8,537
Foreign loans - Latin America [member] | Foreign [member] |  |
Disclosure of collateral held for loan and lease operations portfolio [Line Items] |  |
Carrying value of the assets | 117,094 | 105,425
Fair value of collateral | 246,462 | 175,476
Carrying value of the assets | 11,242 | 10,262
Fair value of collateral | 3,758 | 3,598
Individuals [member] |  |
Disclosure of collateral held for loan and lease operations portfolio [Line Items] |  |
Carrying value of the assets | 57,842 | 52,608
Fair value of collateral | 145,775 | 132,007
Carrying value of the assets | 1,054 | 1,079
Fair value of collateral | 993 | 1,028
Individuals [member] | Vehicles [member] |  |
Disclosure of collateral held for loan and lease operations portfolio [Line Items] |  |
Carrying value of the assets | 15,173 | 13,618
Fair value of collateral | 35,266 | 34,368
Carrying value of the assets | 298 | 177
Fair value of collateral | 280 | 163
Individuals [member] | Personal loan [member] |  |
Disclosure of collateral held for loan and lease operations portfolio [Line Items] |  |
Carrying value of the assets | 643 | 370
Fair value of collateral | 1,949 | 1,398
Carrying value of the assets | 753 | 901
Fair value of collateral | 711 | 864
Individuals [member] | Mortgages [member] |  |
Disclosure of collateral held for loan and lease operations portfolio [Line Items] |  |
Carrying value of the assets | 42,026 | 38,620
Fair value of collateral | 108,560 | 96,241
Carrying value of the assets | 3 | 1
Fair value of collateral | R$ 2 | R$ 1

X
- Definition Collateral assets carrying value, over-collateralized assets. + References No definition available. + Details
Name: | itub_CollateralAssetsCarryingValueOverCollateralizedAssets
Namespace Prefix: | itub_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Collateral assets carrying value, under-collateralized assets. + References No definition available. + Details
Name: | itub_CollateralAssetsCarryingValueUnderCollateralizedAssets
Namespace Prefix: | itub_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Collateral fair value, over-collateralized assets. + References No definition available. + Details
Name: | itub_CollateralFairValueOverCollateralizedAssets
Namespace Prefix: | itub_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Collateral fair value, Under-collateralized assets. + References No definition available. + Details
Name: | itub_CollateralFairValueUnderCollateralizedAssets
Namespace Prefix: | itub_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Disclosure of collateral held for loan and lease operations portfolio [Line Items] + References No definition available. + Details
Name: | itub_DisclosureOfCollateralHeldForLoanAndLeaseOperationsPortfolioLineItems
Namespace Prefix: | itub_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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

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

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

X
- Details
Name: | ifrs-full_BorrowingsByNameAxis=itub_IndividualsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_ClassesOfAssetsAxis=ifrs-full_VehiclesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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

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