XML 281 R229.htm IDEA: XBRL DOCUMENT
v3.19.1

Risk and Capital Management - Summary of Funds Obtained Through the Issuance of Subordinated Debt Securities (Detail) | 12 Months Ended
--- | ---
Dec. 31, 2018 BRL (R$)
Disclosure of assets and liabilities according to their remaining contractual maturities [Line Items] |
Account balance | R$ 35,205,000,000
Brazil, Brazil Real |
Disclosure of assets and liabilities according to their remaining contractual maturities [Line Items] |
Principal amount (original currency) | 2,470,000,000
Account balance | R$ 4,902,000,000
Brazil, Brazil Real | Subordinated financial bills eight [Member] |
Disclosure of assets and liabilities according to their remaining contractual maturities [Line Items] |
Name of currency | BRL
Issue | 2012
Maturity | 2019
Return p.a. | 110% of CDI
Principal amount (original currency) | R$ 2,000,000
Account balance | R$ 4,000,000
Brazil, Brazil Real | Subordinated financial bills nine [Member] |
Disclosure of assets and liabilities according to their remaining contractual maturities [Line Items] |
Name of currency | BRL
Return p.a. | 11.96
Principal amount (original currency) | R$ 1,000,000
Account balance | R$ 2,000,000
Brazil, Brazil Real | Subordinated financial bills ten [Member] |
Disclosure of assets and liabilities according to their remaining contractual maturities [Line Items] |
Name of currency | BRL
Return p.a. | IPCA + 4.7% to 6.3%
Principal amount (original currency) | R$ 12,000,000
Account balance | R$ 26,000,000
Brazil, Brazil Real | Subordinated financial bills eleven [Member] |
Disclosure of assets and liabilities according to their remaining contractual maturities [Line Items] |
Name of currency | BRL
Issue | 2012
Maturity | 2020
Return p.a. | 111% of CDI
Principal amount (original currency) | R$ 101,000,000
Account balance | R$ 187,000,000
Brazil, Brazil Real | Subordinated financial bills twelve [Member] |
Disclosure of assets and liabilities according to their remaining contractual maturities [Line Items] |
Name of currency | BRL
Return p.a. | IPCA + 6% to 6.17%
Principal amount (original currency) | R$ 1,000,000
Account balance | R$ 2,000,000
Brazil, Brazil Real | Subordinated financial bills thirteen [Member] |
Disclosure of assets and liabilities according to their remaining contractual maturities [Line Items] |
Name of currency | BRL
Issue | 2011
Maturity | 2021
Return p.a. | 109.25% to 110.5% of CDI
Principal amount (original currency) | R$ 20,000,000
Account balance | R$ 44,000,000
Brazil, Brazil Real | Subordinated financial bills fourteen [Member] |
Disclosure of assets and liabilities according to their remaining contractual maturities [Line Items] |
Name of currency | BRL
Issue | 2012
Maturity | 2022
Return p.a. | IPCA + 5.15% to 5.83%
Principal amount (original currency) | R$ 6,000,000
Account balance | R$ 13,000,000
Brazil, Brazil Real | Subordinated financial bills fifteen [Member] |
Disclosure of assets and liabilities according to their remaining contractual maturities [Line Items] |
Name of currency | BRL
Return p.a. | IGPM + 4.63%
Principal amount (original currency) | R$ 2,307,000,000
Account balance | 4,595,000,000
Brazil, Brazil Real | Subordinated financial bills sixteen [Member] |
Disclosure of assets and liabilities according to their remaining contractual maturities [Line Items] |
Principal amount (original currency) | 20,000,000
Account balance | R$ 29,000,000
Brazil, Brazil Real | Subordinated financial bills six [Member] |
Disclosure of assets and liabilities according to their remaining contractual maturities [Line Items] |
Name of currency | BRL
Issue | 2011
Maturity | 2019
Return p.a. | 109% to 109.7% of CDI
United States of America, Dollars |
Disclosure of assets and liabilities according to their remaining contractual maturities [Line Items] |
Principal amount (original currency) | R$ 7,721,000,000
Account balance | R$ 30,303,000,000
United States of America, Dollars | Subordinated financial bills sixteen [Member] |
Disclosure of assets and liabilities according to their remaining contractual maturities [Line Items] |
Name of currency | USD
Issue | 2010
Maturity | 2020
Return p.a. | 6.20
United States of America, Dollars | Subordinated euronotes [Member] |
Disclosure of assets and liabilities according to their remaining contractual maturities [Line Items] |
Principal amount (original currency) | R$ 990,000,000
Account balance | R$ 3,881,000,000
United States of America, Dollars | Subordinated euronotes one [Member] |
Disclosure of assets and liabilities according to their remaining contractual maturities [Line Items] |
Name of currency | USD
Issue | 2010
Maturity | 2021
Return p.a. | 5.75
Principal amount (original currency) | R$ 1,000,000,000
Account balance | R$ 3,987,000,000
United States of America, Dollars | Subordinated euronotes two [Member] |
Disclosure of assets and liabilities according to their remaining contractual maturities [Line Items] |
Name of currency | USD
Issue | 2011
Maturity | 2021
Return p.a. | 5.75% to 6.20%
Principal amount (original currency) | R$ 730,000,000
Account balance | R$ 2,839,000,000
United States of America, Dollars | Subordinated euronotes three [Member] |
Disclosure of assets and liabilities according to their remaining contractual maturities [Line Items] |
Name of currency | USD
Issue | 2012
Maturity | 2021
Return p.a. | 6.20
Principal amount (original currency) | R$ 550,000,000
Account balance | R$ 2,131,000,000
United States of America, Dollars | Subordinated euronotes four [Member] |
Disclosure of assets and liabilities according to their remaining contractual maturities [Line Items] |
Name of currency | USD
Issue | 2012
Maturity | 2022
Return p.a. | 5.50% to 5.65%
Principal amount (original currency) | R$ 2,600,000,000
Account balance | R$ 10,256,000,000
United States of America, Dollars | Subordinated euronotes five [Member] |
Disclosure of assets and liabilities according to their remaining contractual maturities [Line Items] |
Name of currency | USD
Issue | 2012
Maturity | 2023
Return p.a. | 5.13
Principal amount (original currency) | R$ 1,851,000,000
Account balance | R$ 7,209,000,000

X
- Definition The basis (reference rate) used for calculation of the interest rate on borrowings. [Refer: Borrowings] + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IFRS -Number 7 -IssueDate 2017-01-01 -Paragraph 7 -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=7&date=2017-03-01&anchor=para_7&doctype=Standard -URIDate 2017-03-09 + Details
Name: | ifrs-full_BorrowingsInterestRateBasis
Namespace Prefix: | ifrs-full_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition The maturity of borrowings. [Refer: Borrowings] + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IFRS -Number 7 -IssueDate 2017-01-01 -Paragraph 7 -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=7&date=2017-03-01&anchor=para_7&doctype=Standard -URIDate 2017-03-09 + Details
Name: | ifrs-full_BorrowingsMaturity
Namespace Prefix: | ifrs-full_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition The currency in which the borrowings are denominated. [Refer: Borrowings] + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IFRS -Number 7 -IssueDate 2017-01-01 -Paragraph 7 -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=7&date=2017-03-01&anchor=para_7&doctype=Standard -URIDate 2017-03-09 + Details
Name: | ifrs-full_BorrowingsOriginalCurrency
Namespace Prefix: | ifrs-full_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition The amount of liabilities that are subordinate to other liabilities with respect to claims. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 1 -IssueDate 2017-01-01 -Paragraph 55 -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=1&date=2017-03-01&anchor=para_55&doctype=Standard -URIDate 2017-03-09 + Details
Name: | ifrs-full_SubordinatedLiabilities
Namespace Prefix: | ifrs-full_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Borrowings issue date. + References No definition available. + Details
Name: | itub_BorrowingsIssueDate
Namespace Prefix: | itub_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Debt instrument face amount. + References No definition available. + Details
Name: | itub_DebtInstrumentFaceAmount1
Namespace Prefix: | itub_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Disclosure of assets and liabilities according to their remaining contractual maturities [Line Items] + References No definition available. + Details
Name: | itub_DisclosureOfAssetsAndLiabilitiesAccordingToTheirRemainingContractualMaturitiesLineItems
Namespace Prefix: | itub_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Details
Name: | us-gaap_CurrencyAxis=currency_BRL
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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

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

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

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

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

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

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

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

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

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

X
- Details
Name: | us-gaap_CurrencyAxis=currency_USD
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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

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

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

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

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

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