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v3.23.1

Risk and Capital Management (Details 15) - BRL (R$) R$ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2022 | Dec. 31, 2021
IfrsStatementLineItems [Line Items] |  |
Common Equity Tier 1 | R$ 147,781 | R$ 130,716
Tier 1 | 166,868 | 149,912
Total capital (PR) | 185,415 | 169,797
Total risk-weighted assets (RWA) | R$ 1,238,582 | R$ 1,153,841
Common Equity Tier 1 ratio (%) | 11.90% | 11.30%
Conservation | 13.50% | 13.00%
Total capital ratio (%) | 15.00% | 14.70%
Capital conservation buffer requirement (%) | 2.50% | 2.00%
Countercyclical buffer requirement (%) | (0.00%) | (0.00%)
Bank G-SIB and/or D-SIB additional requirements (%) | 1.00% | 1.00%
Total of bank CET1 specific buffer requirements (%) | 3.50% | 3.00%
Till April Two Thousand And Twenty Two [Member] | Bacen Resolution Four Seven Eight Three [Member] |  |
IfrsStatementLineItems [Line Items] |  |
Conservation | 2.50% |

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

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

X
- Definition Common equity tier one capital amount + References No definition available. + Details
Name: | itub_CommonEquityTierOneCapitalAmount
Namespace Prefix: | itub_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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

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

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

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

X
- Definition Referential equity. + References No definition available. + Details
Name: | itub_ReferentialEquity
Namespace Prefix: | itub_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Risk weighted assets1 + References No definition available. + Details
Name: | itub_RiskWeightedAssets1
Namespace Prefix: | itub_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Systemic percentage of risk weighted assets. + References No definition available. + Details
Name: | itub_SystemicPercentageOfRiskWeightedAssets
Namespace Prefix: | itub_
Data Type: | dtr-types:percentItemType
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
- Definition Tier one common equity tier one and additional tier one capital. + References No definition available. + Details
Name: | itub_TierOneCommonEquityTierOneAndAdditionalTierOneCapital
Namespace Prefix: | itub_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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: |