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v3.23.1

Provisions, contingent assets and contingent liabilities (Details 2) - Guarantees Of Contingencies Provisions And Legal Obligations [Member] - BRL (R$) R$ in Millions | Dec. 31, 2022 | Dec. 31, 2021
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IfrsStatementLineItems [Line Items] |  |
Deposits in guarantee (Note 18a) | R$ 13,001 | R$ 12,264
Investments fund quotas | 615 | 690
Surety | 5,262 | 4,115
Insurance bond | 19,256 | 18,771
Guarantee by government securities | 292 | 242
Total | 38,426 | R$ 36,082
Civil [Member] |  |
IfrsStatementLineItems [Line Items] |  |
Deposits in guarantee (Note 18a) | 1,761 |
Investments fund quotas | 416 |
Surety | 64 |
Insurance bond | 1,622 |
Total | 3,863 |
Labour [Member] |  |
IfrsStatementLineItems [Line Items] |  |
Deposits in guarantee (Note 18a) | 2,044 |
Investments fund quotas | 136 |
Surety | 52 |
Insurance bond | 1,461 |
Total | 3,693 |
Tax [Member] |  |
IfrsStatementLineItems [Line Items] |  |
Deposits in guarantee (Note 18a) | 9,196 |
Investments fund quotas | 63 |
Surety | 5,146 |
Insurance bond | 16,173 |
Guarantee by government securities | 292 |
Total | R$ 30,870 |

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- Definition Deposits in guarantee. + References No definition available. + Details
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Namespace Prefix: | itub_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition Guarantee by government securities. + References No definition available. + Details
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Namespace Prefix: | itub_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition Guarantees related to legal proceedings. + References No definition available. + Details
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Namespace Prefix: | itub_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- References No definition available. + Details
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- Definition Insurance bond. + References No definition available. + Details
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Data Type: | xbrli:monetaryItemType
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- Definition Quotas. + References No definition available. + Details
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- Definition Surety. + References No definition available. + Details
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Namespace Prefix: | itub_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
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- Details
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Namespace Prefix: |
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Balance Type: |
Period Type: |

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- Details
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Period Type: |

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- Details
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Namespace Prefix: |
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Balance Type: |
Period Type: |