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Significant accounting policies (Tables) | 12 Months Ended
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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.

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