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Significant accounting policies (Tables)
 12 Months Ended
Dec. 31, 2019
Text Block [Abstract]  
Summary of Consolidated Companies
The following table shows the main consolidated companies, which together represent over 95% of total consolidated assets, as well as the interests of ITAÚ UNIBANCO HOLDING in their voting capital.
 
     
Functional
currency
(1)
  
Incorporation
country
  
Activity
  
Interest in voting
capital at
  
Interest in total

capital at
 
              
12/31/2019
  
12/31/2018
  
12/31/2019
  
12/31/2018
 
In Brazil
            
Banco Itaú BBA S.A.
   Real  Brazil  Financial institution   100.00%   100.00%   100.00%   100.00% 
Banco Itaú Consignado S.A.
   Real  Brazil  Financial institution   100.00%   100.00%   100.00%   100.00% 
Banco Itaucard S.A.
   Real  Brazil  Financial institution   100.00%   100.00%   100.00%   100.00% 
Banco Itauleasing S.A.
   Real  Brazil  Financial institution   100.00%   100.00%   100.00%   100.00% 
Cia. Itaú de Capitalização
   Real  Brazil  Capitalization   100.00%   100.00%   100.00%   100.00% 
Dibens Leasing S.A. - Arrendamento Mercantil
   Real  Brazil  Lease   100.00%   100.00%   100.00%   100.00% 
Financeira Itaú CBD S.A. Crédito, Financiamento e Investimento
   Real  Brazil  Consumer finance
credit		   50.00%   50.00%   50.00%   50.00% 
Hipercard Banco Múltiplo S.A.
   Real  Brazil  Financial institution   100.00%   100.00%   100.00%   100.00% 
Itauseg Seguradora S.A.
   Real  Brazil  Insurance   100.00%   100.00%   100.00%   100.00% 
Itaú Corretora de Valores S.A.
   Real  Brazil  Securities Broker   100.00%   100.00%   100.00%   100.00% 
Itaú Seguros S.A.
   Real  Brazil  Insurance   100.00%   100.00%   100.00%   100.00% 
Itaú Unibanco S.A.
   Real  Brazil  Financial institution   100.00%   100.00%   100.00%   100.00% 
Itaú Vida e Previdência S.A.
   Real  Brazil  Pension plan   100.00%   100.00%   100.00%   100.00% 
Luizacred S.A. Sociedade de Crédito, Financiamento e Investimento
   Real  Brazil  Consumer finance
credit		   50.00%   50.00%   50.00%   50.00% 
Redecard S.A.
Foreign
   Real  Brazil  Acquirer   100.00%   100.00%   100.00%   100.00% 
Itaú CorpBanca Colombia S.A.
  (Note 3) Colombian peso  Colombia  Financial institution   33.22%   25.28%   33.22%   25.28% 
Banco Itaú (Suisse) SA
   Swiss franc  Switzerland  Financial institution   100.00%   100.00%   100.00%   100.00% 
Banco Itaú Argentina S.A.
   Argentinian peso  Argentina  Financial institution   100.00%   100.00%   100.00%   100.00% 
Banco Itaú Paraguay S.A.
   Guarani  Paraguay  Financial institution   100.00%   100.00%   100.00%   100.00% 
Banco Itaú Uruguay S.A.
   Uruguayan peso  Uruguay  Financial institution   100.00%   100.00%   100.00%   100.00% 
Itau Bank, Ltd.
   Real  Cayman Islands  Financial institution   100.00%   100.00%   100.00%   100.00% 
Itau BBA International plc
   Dollar  United Kingdom  Financial institution   100.00%   100.00%   100.00%   100.00% 
Itau BBA USA Securities Inc.
   Real  United States  Broker   100.00%   100.00%   100.00%   100.00% 
Itaú CorpBanca
(2)
  (Note 3) Chilean peso  Chile  Financial institution   38.14%   38.14%   38.14%   38.14% 
 
(1)
All foreign branches and subsidiaries of ITAÚ UNIBANCO HOLDING have the same functional currency as the parent company, except for CorpBanca New York Branch, which uses the US dollar.
(2)
ITAÚ UNIBANCO HOLDING controls ITAÚ CORPBANCA due to the shareholders’ agreement.