XML 130 R133.htm IDEA: XBRL DOCUMENT
v3.20.1

Securities Sold Under Repurchase Agreements and Interbank and Institutional Market Debts - Summary of Securities Sold Under Repurchase Agreements (Detail) - BRL (R$) R$ in Millions | 12 Months Ended |
--- | --- | ---
Dec. 31, 2019 | Dec. 31, 2018
Disclosure Of Repurchase Agreements [Line Items] |  |
Securities sold under repurchase agreements | R$ 256,583 | R$ 330,237
Assets Pledged as Collateral [member] |  |
Disclosure Of Repurchase Agreements [Line Items] |  |
Securities sold under repurchase agreements | 69,761 | 77,651
Assets Pledged as Collateral [member] | Government securities - abroad [member] |  |
Disclosure Of Repurchase Agreements [Line Items] |  |
Securities sold under repurchase agreements | 46,271 | 46,680
Assets Pledged as Collateral [member] | Corporate debt securities [member] |  |
Disclosure Of Repurchase Agreements [Line Items] |  |
Securities sold under repurchase agreements | 17,665 | 9,051
Assets Pledged as Collateral [member] | Own issue [member] |  |
Disclosure Of Repurchase Agreements [Line Items] |  |
Securities sold under repurchase agreements | 5,258 | 21,417
Assets Pledged as Collateral [member] | Foreign securities [member] |  |
Disclosure Of Repurchase Agreements [Line Items] |  |
Securities sold under repurchase agreements | R$ 567 | 503
Assets Pledged as Collateral [member] | Bottom of range [member] | Government securities - abroad [member] |  |
Disclosure Of Repurchase Agreements [Line Items] |  |
Percentage of securities sold under repurchase agreements | 3.88% |
Assets Pledged as Collateral [member] | Bottom of range [member] | Corporate debt securities [member] |  |
Disclosure Of Repurchase Agreements [Line Items] |  |
Percentage of securities sold under repurchase agreements | 25.00% |
Assets Pledged as Collateral [member] | Bottom of range [member] | Own issue [member] |  |
Disclosure Of Repurchase Agreements [Line Items] |  |
Percentage of securities sold under repurchase agreements | 82.50% |
Assets Pledged as Collateral [member] | Bottom of range [member] | Foreign securities [member] |  |
Disclosure Of Repurchase Agreements [Line Items] |  |
Percentage of securities sold under repurchase agreements | 0.16% |
Assets Pledged as Collateral [member] | Top of range [member] | Government securities - abroad [member] |  |
Disclosure Of Repurchase Agreements [Line Items] |  |
Percentage of securities sold under repurchase agreements | 93.50% |
Assets Pledged as Collateral [member] | Top of range [member] | Corporate debt securities [member] |  |
Disclosure Of Repurchase Agreements [Line Items] |  |
Percentage of securities sold under repurchase agreements | 89.00% |
Assets Pledged as Collateral [member] | Top of range [member] | Own issue [member] |  |
Disclosure Of Repurchase Agreements [Line Items] |  |
Percentage of securities sold under repurchase agreements | 16.93% |
Assets Pledged as Collateral [member] | Top of range [member] | Foreign securities [member] |  |
Disclosure Of Repurchase Agreements [Line Items] |  |
Percentage of securities sold under repurchase agreements | 34.90% |
Assets Received as Collateral [member] |  |
Disclosure Of Repurchase Agreements [Line Items] |  |
Securities sold under repurchase agreements | R$ 140,004 | 172,953
Assets Received as Collateral [member] | Bottom of range [member] |  |
Disclosure Of Repurchase Agreements [Line Items] |  |
Percentage of securities sold under repurchase agreements | 3.80% |
Assets Received as Collateral [member] | Top of range [member] |  |
Disclosure Of Repurchase Agreements [Line Items] |  |
Percentage of securities sold under repurchase agreements | 4.40% |
Right to sell or repledge collateral [member] |  |
Disclosure Of Repurchase Agreements [Line Items] |  |
Securities sold under repurchase agreements | R$ 46,818 | 79,633
Right to sell or repledge collateral [member] | Bottom of range [member] |  |
Disclosure Of Repurchase Agreements [Line Items] |  |
Percentage of securities sold under repurchase agreements | 1.08% |
Right to sell or repledge collateral [member] | Top of range [member] |  |
Disclosure Of Repurchase Agreements [Line Items] |  |
Percentage of securities sold under repurchase agreements | 6.00% |
Current [member] |  |
Disclosure Of Repurchase Agreements [Line Items] |  |
Securities sold under repurchase agreements | R$ 223,876 | 271,521
Current [member] | Assets Pledged as Collateral [member] |  |
Disclosure Of Repurchase Agreements [Line Items] |  |
Securities sold under repurchase agreements | 67,065 | 71,231
Current [member] | Assets Pledged as Collateral [member] | Government securities - abroad [member] |  |
Disclosure Of Repurchase Agreements [Line Items] |  |
Securities sold under repurchase agreements | 46,271 | 46,676
Current [member] | Assets Pledged as Collateral [member] | Corporate debt securities [member] |  |
Disclosure Of Repurchase Agreements [Line Items] |  |
Securities sold under repurchase agreements | 17,665 | 9,051
Current [member] | Assets Pledged as Collateral [member] | Own issue [member] |  |
Disclosure Of Repurchase Agreements [Line Items] |  |
Securities sold under repurchase agreements | 2,831 | 15,156
Current [member] | Assets Pledged as Collateral [member] | Foreign securities [member] |  |
Disclosure Of Repurchase Agreements [Line Items] |  |
Securities sold under repurchase agreements | 298 | 348
Current [member] | Assets Received as Collateral [member] |  |
Disclosure Of Repurchase Agreements [Line Items] |  |
Securities sold under repurchase agreements | 140,004 | 172,953
Current [member] | Right to sell or repledge collateral [member] |  |
Disclosure Of Repurchase Agreements [Line Items] |  |
Securities sold under repurchase agreements | 16,807 | 27,337
Non-current [member] |  |
Disclosure Of Repurchase Agreements [Line Items] |  |
Securities sold under repurchase agreements | 32,707 | 58,716
Non-current [member] | Assets Pledged as Collateral [member] |  |
Disclosure Of Repurchase Agreements [Line Items] |  |
Securities sold under repurchase agreements | 2,696 | 6,420
Non-current [member] | Assets Pledged as Collateral [member] | Government securities - abroad [member] |  |
Disclosure Of Repurchase Agreements [Line Items] |  |
Securities sold under repurchase agreements |  | 4
Non-current [member] | Assets Pledged as Collateral [member] | Own issue [member] |  |
Disclosure Of Repurchase Agreements [Line Items] |  |
Securities sold under repurchase agreements | 2,427 | 6,261
Non-current [member] | Assets Pledged as Collateral [member] | Foreign securities [member] |  |
Disclosure Of Repurchase Agreements [Line Items] |  |
Securities sold under repurchase agreements | 269 | 155
Non-current [member] | Right to sell or repledge collateral [member] |  |
Disclosure Of Repurchase Agreements [Line Items] |  |
Securities sold under repurchase agreements | R$ 30,011 | R$ 52,296

X
- Definition The amount of instruments sold with the intent to reacquire in repurchase agreements and cash collateral on securities lent. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 1 -IssueDate 2019-01-01 -Paragraph 55 -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=1&code=ifrs-tx-2019-en-r&anchor=para_55&doctype=Standard -URIDate 2019-03-27 + Details
Name: | ifrs-full_RepurchaseAgreementsAndCashCollateralOnSecuritiesLent
Namespace Prefix: | ifrs-full_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Disclosure Of Repurchase Agreements [Line Items] + References No definition available. + Details
Name: | itub_DisclosureOfRepurchaseAgreementsLineItems
Namespace Prefix: | itub_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Securities sold under agreements to repurchase interest rate. + References No definition available. + Details
Name: | itub_SecuritiesSoldUnderAgreementsToRepurchaseInterestRate
Namespace Prefix: | itub_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

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

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

X
- Details
Name: | ifrs-full_RangeAxis=ifrs-full_BottomOfRangeMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_RangeAxis=ifrs-full_TopOfRangeMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_TypesOfFinancialAssetsAxis=itub_AssetsReceivedAsCollateralMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_TypesOfFinancialAssetsAxis=itub_RightToSellOrRepledgeCollateralMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_PastDueStatusAxis=ifrs-full_CurrentMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_PastDueStatusAxis=itub_NonCurrentMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |