XML 191 R154.htm IDEA: XBRL DOCUMENT
v3.22.1

Share-based payment - Additional Information (Detail) | 12 Months Ended
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Dec. 31, 2021
Disclosure of terms and conditions of share-based payment arrangement [line items] |
Period of variable compensation paid in shares | three years
Bottom of range [member] | Partner plan [member] |
Disclosure of terms and conditions of share-based payment arrangement [line items] |
Share-based payment arrangement options granted expiration period | 3 years
Top of range [member] |
Disclosure of terms and conditions of share-based payment arrangement [line items] |
Percentage of shares held by controlling and minority stockholders | 0.50%
Top of range [member] | Partner plan [member] |
Disclosure of terms and conditions of share-based payment arrangement [line items] |
Share-based payment arrangement options granted expiration period | 5 years

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- Definition Line items represent concepts included in a table. These concepts are used to disclose reportable information associated with members defined in one or many axes of the table. + References No definition available. + Details
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Namespace Prefix: | ifrs-full_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition Percentage of shares held. + References No definition available. + Details
Name: | itub_PercentageOfSharesHeld
Namespace Prefix: | itub_
Data Type: | dtr-types:percentItemType
Balance Type: | na
Period Type: | duration

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- Definition Period of variable compensation paid in shares. + References No definition available. + Details
Name: | itub_PeriodOfVariableCompensationPaidInShares
Namespace Prefix: | itub_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition Share-based payment arrangement options granted expiration period. + References No definition available. + Details
Name: | itub_SharebasedPaymentArrangementOptionsGrantedExpirationPeriod
Namespace Prefix: | itub_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

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

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- Details
Name: | ifrs-full_TypesOfSharebasedPaymentArrangementsAxis=itub_PartnerPlanMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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