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Risk and Capital Management - Composition Of Capital Adequcy (Detail) - BRL (R$) R$ in Millions | 12 Months Ended
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Dec. 31, 2021 | Dec. 31, 2020
Disclosure Detail Of Composition Of Capital Adequacy [Line Items] |  |
Common Equity Tier I | R$ 130,716 | R$ 119,960
Tier I | 149,912 | 137,157
Total capital (PR) | 169,797 | 151,244
Total risk-weighted assets (RWA) | R$ 1,153,841 | R$ 1,042,207
Common Equity Tier 1 ratio (%) | 11.30% | 11.50%
Tier 1 ratio (%) | 13.00% | 13.20%
Total capital ratio (%) | 14.70% | 14.50%
Capital conservation buffer requirement (%) | 2.00% | 1.25%
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 (%) | 3.00% | 2.25%

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- Definition Additional common equity tier one capital percentage of risk weighted assets. + References No definition available. + Details
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- Definition Capital risk weighted assets percentage. + References No definition available. + Details
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- Definition Common equity tier one capital amount + References No definition available. + Details
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- Definition Common equity tier one capital percentage of risk weighted assets. + References No definition available. + Details
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- Definition Conservation percentage of risk weighted assets. + References No definition available. + Details
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- Definition Counter cyclical percentage of risk weighted assets. + References No definition available. + Details
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- References No definition available. + Details
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- Definition Referential equity. + References No definition available. + Details
Name: | itub_ReferentialEquity
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- Definition Risk weighted assets1 + References No definition available. + Details
Name: | itub_RiskWeightedAssets1
Namespace Prefix: | itub_
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Balance Type: | debit
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- Definition Systemic percentage of risk weighted assets. + References No definition available. + Details
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Namespace Prefix: | itub_
Data Type: | dtr-types:percentItemType
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- Definition Tier one capital percentage of risk weighted assets. + References No definition available. + Details
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- Definition Tier one common equity tier one and additional tier one capital. + References No definition available. + Details
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Namespace Prefix: | itub_
Data Type: | xbrli:monetaryItemType
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