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Risk and Capital Management - Summary of Funding from Clients (Detail) - BRL (R$)
R$ in Millions
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Disclosure of Sources of Funding [Line Items]    
Deposits R$ 507,060 R$ 463,424
Funds from acceptances and issuance of securities 158,972 R$ 127,842
Subordinated debt 36,627  
Total R$ 277,000  
Percentage of funding from clients 100.00% 100.00%
ITAU UNIBANCO HOLDING [Member]    
Disclosure of Sources of Funding [Line Items]    
Deposits R$ 507,060 R$ 463,424
Demand deposits 82,306 72,581
Savings deposits 144,558 136,865
Time deposits 277,166 251,300
Other 3,030 2,678
Funds from acceptances and issuance of securities 143,569 111,566
Funds from own issue 5,258 21,417
Subordinated debt 59,462 49,313
Total 715,349 645,720
0-30 days [Member] | ITAU UNIBANCO HOLDING [Member]    
Disclosure of Sources of Funding [Line Items]    
Deposits 272,447 248,913
Demand deposits 82,306 72,581
Savings deposits 144,558 136,865
Time deposits 44,855 37,784
Other 728 1,683
Funds from acceptances and issuance of securities 4,293 2,285
Funds from own issue 235 1,831
Subordinated debt 2 2
Total 276,977 253,031
Demand deposits [Member]    
Disclosure of Sources of Funding [Line Items]    
Deposits R$ 82,306 R$ 72,581
Percentage of funding from clients 11.50% 11.20%
Savings deposits [Member]    
Disclosure of Sources of Funding [Line Items]    
Percentage of funding from clients 20.20% 21.20%
Time deposits [Member]    
Disclosure of Sources of Funding [Line Items]    
Deposits R$ 277,166 R$ 251,300
Percentage of funding from clients 38.80% 38.90%
Other [Member]    
Disclosure of Sources of Funding [Line Items]    
Deposits R$ 9 R$ 3
Percentage of funding from clients 0.40% 0.40%
Security Deposits [Member]    
Disclosure of Sources of Funding [Line Items]    
Percentage of funding from clients 20.10% 17.30%
Issued debt [Member]    
Disclosure of Sources of Funding [Line Items]    
Percentage of funding from clients 0.70% 3.30%
Subordinated debt [Member]    
Disclosure of Sources of Funding [Line Items]    
Percentage of funding from clients 8.30% 7.60%