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Risk and Capital Management - Summary of Funding from Clients (Detail) - BRL (R$) R$ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2021 | Dec. 31, 2020
Disclosure of Sources of Funding [Line Items] |  |
Deposits | R$ 850,372.0 | R$ 809,010.0
Subordinated debt | 75,036.0 | R$ 74,916.0
Total | R$ 405.2 |
Percentage of funding from clients | 100.00% | 100.00%
ITAU UNIBANCO HOLDING [Member] |  |
Disclosure of Sources of Funding [Line Items] |  |
Deposits | R$ 850,372.0 | R$ 809,010.0
Demand deposits | 158,116.0 | 134,805.0
Savings deposits | 190,601.0 | 179,470.0
Time deposits | 497,051.0 | 491,234.0
Other | 4,604.0 | 3,501.0
Funds from acceptances and issuance of securities | 143,138.0 | 136,638.0
Funds from own issue | 21.0 | 1,985.0
Subordinated debt | 75,036.0 | 74,916.0
Total | 1,068,567.0 | 1,022,549.0
0-30 days [Member] | ITAU UNIBANCO HOLDING [Member] |  |
Disclosure of Sources of Funding [Line Items] |  |
Deposits | 402,930.0 | 370,604.0
Demand deposits | 158,116.0 | 134,805.0
Savings deposits | 190,601.0 | 179,470.0
Time deposits | 52,563.0 | 55,778.0
Other | 1,650.0 | 551.0
Funds from acceptances and issuance of securities | 2,310.0 | 1,978.0
Funds from own issue | 0.0 | 218.0
Subordinated debt | 0.0 | 6,657.0
Total | 405,240.0 | 379,457.0
Demand deposits [Member] |  |
Disclosure of Sources of Funding [Line Items] |  |
Deposits | R$ 158,116.0 | R$ 134,805.0
Percentage of funding from clients | 14.80% | 13.20%
Savings deposits [Member] |  |
Disclosure of Sources of Funding [Line Items] |  |
Percentage of funding from clients | 17.90% | 17.50%
Time deposits [Member] |  |
Disclosure of Sources of Funding [Line Items] |  |
Deposits | R$ 497,051.0 | R$ 491,234.0
Percentage of funding from clients | 46.50% | 48.00%
Other [Member] |  |
Disclosure of Sources of Funding [Line Items] |  |
Deposits | R$ 828.0 | R$ 71.0
Percentage of funding from clients | 0.40% | 0.40%
Security Deposits [Member] |  |
Disclosure of Sources of Funding [Line Items] |  |
Percentage of funding from clients | 13.40% | 13.40%
Issued debt [Member] |  |
Disclosure of Sources of Funding [Line Items] |  |
Percentage of funding from clients | 0.00% | 0.20%
Subordinated debt [Member] |  |
Disclosure of Sources of Funding [Line Items] |  |
Percentage of funding from clients | 7.00% | 7.30%

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