XML 237 R167.htm IDEA: XBRL DOCUMENT
v3.20.1

Post-employment Benefits - Summary of Allocation of Assets by Category, Segmented Into Quoted In an Active Market and Not Quoted In an Active Market (Detail) - BRL (R$) R$ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2019 | Dec. 31, 2018
Disclosure of defined benefit plans [line items] |  |
Fair Value | R$ 22,732 | R$ 18,808
Percentage of allocation | 100.00% | 100.00%
Fixed income securities [member] |  |
Disclosure of defined benefit plans [line items] |  |
Fair Value | R$ 20,672 | R$ 18,065
Percentage of allocation | 90.93% | 96.05%
Fixed income securities [member] | Quoted in an active market [member] |  |
Disclosure of defined benefit plans [line items] |  |
Fair Value | R$ 20,366 | R$ 17,775
Percentage of allocation | 89.59% | 94.51%
Fixed income securities [member] | Non quoted in an active market [member] |  |
Disclosure of defined benefit plans [line items] |  |
Fair Value | R$ 306 | R$ 290
Percentage of allocation | 1.34% | 1.54%
Variable income securities [member] |  |
Disclosure of defined benefit plans [line items] |  |
Fair Value | R$ 1,392 | R$ 24
Percentage of allocation | 6.12% | 0.13%
Variable income securities [member] | Quoted in an active market [member] |  |
Disclosure of defined benefit plans [line items] |  |
Fair Value | R$ 1,384 | R$ 18
Percentage of allocation | 6.09% | 0.09%
Variable income securities [member] | Non quoted in an active market [member] |  |
Disclosure of defined benefit plans [line items] |  |
Fair Value | R$ 8 | R$ 6
Percentage of allocation | 0.03% | 0.04%
Structured investments [member] |  |
Disclosure of defined benefit plans [line items] |  |
Fair Value | R$ 65 | R$ 59
Percentage of allocation | 0.29% | 0.31%
Structured investments [member] | Quoted in an active market [member] |  |
Disclosure of defined benefit plans [line items] |  |
Fair Value |  | R$ 1
Percentage of allocation | 0.00% | 0.01%
Structured investments [member] | Non quoted in an active market [member] |  |
Disclosure of defined benefit plans [line items] |  |
Fair Value | R$ 65 | R$ 58
Percentage of allocation | 0.29% | 0.30%
Real estate [Member] |  |
Disclosure of defined benefit plans [line items] |  |
Fair Value | R$ 529 | R$ 578
Percentage of allocation | 2.33% | 3.07%
Loans to participants [Member] |  |
Disclosure of defined benefit plans [line items] |  |
Fair Value | R$ 74 | R$ 82
Percentage of allocation | 0.33% | 0.44%

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

X
- Definition The fair value of defined benefit plan assets. Plan assets comprise assets held by a long-term employee benefit fund and qualifying insurance policies. [Refer: At fair value [member]] + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 19 -IssueDate 2019-01-01 -Paragraph 57 -Subparagraph a -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=19&code=ifrs-tx-2019-en-r&anchor=para_57_a&doctype=Standard -URIDate 2019-03-27 + Details
Name: | ifrs-full_PlanAssetsAtFairValue
Namespace Prefix: | ifrs-full_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Percentage of Allocation of Plan Assets + References No definition available. + Details
Name: | itub_PercentageOfAllocationOfPlanAssets
Namespace Prefix: | itub_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

X
- Details
Name: | ifrs-full_DefinedBenefitPlansAxis=itub_FixedIncomeSecurities1Member
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | itub_DefinedBenefitPlansByNameAxis=itub_QuotedInAnActiveMarketMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | itub_DefinedBenefitPlansByNameAxis=itub_NonquotedInAnActiveMarketMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_DefinedBenefitPlansAxis=itub_VariableIncomeSecuritiesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_DefinedBenefitPlansAxis=itub_StructuredInvestmentsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_DefinedBenefitPlansAxis=itub_RealEstate1Member
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_DefinedBenefitPlansAxis=itub_LoansToParticipantsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |