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Risk and Capital Management - Summary of Funding from Clients (Detail) - BRL (R$)
R$ in Millions
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Jan. 01, 2017
Disclosure of Sources of Funding [Line Items]      
Deposits R$ 463,424 R$ 402,938 R$ 329,414
Subordinated debt 35,205    
Total R$ 253,000    
Percentage of funding from clients 100.00% 100.00%  
ITAU UNIBANCO HOLDING [Member]      
Disclosure of Sources of Funding [Line Items]      
Deposits R$ 463,424 R$ 402,938  
Demand deposits 72,581 68,973  
Savings deposits 136,865 119,980  
Time deposits 251,300 211,800  
Other 2,678 2,185  
Funds from acceptances and issuance of securities 111,566 107,581  
Funds from own issue 21,417 58,837  
Subordinated debt 49,313 52,696  
Total 645,720 622,052  
0-30 days [Member] | ITAU UNIBANCO HOLDING [Member]      
Disclosure of Sources of Funding [Line Items]      
Deposits 248,913 216,842  
Demand deposits 72,581 68,973  
Savings deposits 136,865 119,980  
Time deposits 37,784 27,798  
Other 1,683 91  
Funds from acceptances and issuance of securities 2,285 6,820  
Funds from own issue 1,831 2,570  
Subordinated debt 2 1,315  
Total 253,031 227,547  
Demand deposits [Member]      
Disclosure of Sources of Funding [Line Items]      
Deposits R$ 72,581 R$ 68,973  
Percentage of funding from clients 11.20% 11.10%  
Savings deposits [Member]      
Disclosure of Sources of Funding [Line Items]      
Percentage of funding from clients 21.20% 19.30%  
Time deposits [Member]      
Disclosure of Sources of Funding [Line Items]      
Deposits R$ 251,300 R$ 211,800  
Percentage of funding from clients 38.90% 34.00%  
Other [Member]      
Disclosure of Sources of Funding [Line Items]      
Deposits R$ 3 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 17.30% 17.30%  
Issued debt [Member]      
Disclosure of Sources of Funding [Line Items]      
Percentage of funding from clients 3.30% 9.50%  
Subordinated debt [Member]      
Disclosure of Sources of Funding [Line Items]      
Percentage of funding from clients 7.60% 8.50%