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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%