XML 53 R146.htm IDEA: XBRL DOCUMENT
v3.20.1

Share-based payment - Additional Information (Detail) | 12 Months Ended
--- | ---
Dec. 31, 2019
Disclosure of terms and conditions of share-based payment arrangement [line items] |
Percentage of stock split approved | 50
Percentage of variable compensation paid in cash | 50.00%
Percentage of variable compensation paid in shares | 50.00%
Period of variable compensation paid in shares | three years
Options vesting period | 5 years
Bottom of range [member] |
Disclosure of terms and conditions of share-based payment arrangement [line items] |
Options vesting period | 1 year
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%
Options vesting period | 7 years
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

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

X
- Definition Equity stock split ratio + References No definition available. + Details
Name: | itub_EquityStockSplitRatio
Namespace Prefix: | itub_
Data Type: | xbrli:pureItemType
Balance Type: | na
Period Type: | duration

X
- Definition Option vesting period. + References No definition available. + Details
Name: | itub_OptionVestingPeriod
Namespace Prefix: | itub_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

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

X
- 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

X
- Definition Proportion of variable compensation paid in cash. + References No definition available. + Details
Name: | itub_ProportionOfVariableCompensationPaidInCash
Namespace Prefix: | itub_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition Proportion of variable compensation paid in shares. + References No definition available. + Details
Name: | itub_ProportionOfVariableCompensationPaidInShares
Namespace Prefix: | itub_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

X
- 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

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

X
- Details
Name: | ifrs-full_TypesOfSharebasedPaymentArrangementsAxis=itub_PartnerPlanMember
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: |