XML 266 R229.htm IDEA: XBRL DOCUMENT
v3.22.1

Risk and Capital Management - Composition Of Capital Adequcy Parenthetical (Detail) | 12 Months Ended
--- | ---
Dec. 31, 2021 | Dec. 31, 2020
Disclosure Detail Of Composition Of Capital Adequacy [Line Items] |  |
Conservation | 13.00% | 13.20%
Till April Two Thousand And Twenty Two [Member] | Bacen Resolution Four Seven Eight Three [Member] |  |
Disclosure Detail Of Composition Of Capital Adequacy [Line Items] |  |
Conservation | 2.50% |

X
- References No definition available. + Details
Name: | itub_DisclosureDetailOfCompositionOfCapitalAdequacyLineItems
Namespace Prefix: | itub_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Tier one capital percentage of risk weighted assets. + References No definition available. + Details
Name: | itub_TierOneCapitalPercentageOfRiskWeightedAssets
Namespace Prefix: | itub_
Data Type: | dtr-types:percentItemType
Balance Type: | na
Period Type: | duration

X
- Details
Name: | itub_PeriodOfApplicabilityAxis=itub_TillAprilTwoThousandAndTwentyTwoMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | itub_RegulationAxis=itub_BacenResolutionFourSevenEightThreeMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |