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Significant Accounting Policies - Summary of Consolidated Companies (Detail) | 12 Months Ended
--- | ---
Dec. 31, 2018 | Dec. 31, 2017
Country of domicile [member] | Banco Itau B B A [Member] |  |
Disclosure of subsidiaries [line items] |  |
Incorporation country | Brazil |
Activity | Financial institution |
Interest in voting capital | 100.00% | 100.00%
Interest in total capital | 100.00% | 100.00%
Country of domicile [member] | Banco Itau Consignado S.A. [Member] |  |
Disclosure of subsidiaries [line items] |  |
Incorporation country | Brazil |
Activity | Financial institution |
Interest in voting capital | 100.00% | 100.00%
Interest in total capital | 100.00% | 100.00%
Country of domicile [member] | Banco Itaucard S.A [Member] |  |
Disclosure of subsidiaries [line items] |  |
Incorporation country | Brazil |
Activity | Financial institution |
Interest in voting capital | 100.00% | 100.00%
Interest in total capital | 100.00% | 100.00%
Country of domicile [member] | Banco Itauleasing S.A. [Member] |  |
Disclosure of subsidiaries [line items] |  |
Incorporation country | Brazil |
Activity | Financial institution |
Interest in voting capital | 100.00% | 100.00%
Interest in total capital | 100.00% | 100.00%
Country of domicile [member] | Cia. Itau de Capitalizacao [Member] |  |
Disclosure of subsidiaries [line items] |  |
Incorporation country | Brazil |
Activity | Capitalization |
Interest in voting capital | 100.00% | 100.00%
Interest in total capital | 100.00% | 100.00%
Country of domicile [member] | Dibens Leasing S.A. - Arrendamento Mercantil [Member] |  |
Disclosure of subsidiaries [line items] |  |
Incorporation country | Brazil |
Activity | Leasing |
Interest in voting capital | 100.00% | 100.00%
Interest in total capital | 100.00% | 100.00%
Country of domicile [member] | Financeira Itau CBD S.A. Credito, Financiamento e Investimento [Member] |  |
Disclosure of subsidiaries [line items] |  |
Incorporation country | Brazil |
Activity | Consumer finance credit |
Interest in voting capital | 50.00% | 50.00%
Interest in total capital | 50.00% | 50.00%
Country of domicile [member] | Hipercard Banco Multiplo S.A. [Member] |  |
Disclosure of subsidiaries [line items] |  |
Incorporation country | Brazil |
Activity | Financial institution |
Interest in voting capital | 100.00% | 100.00%
Interest in total capital | 100.00% | 100.00%
Country of domicile [member] | Itauseg Seguradora S.A. [Member] |  |
Disclosure of subsidiaries [line items] |  |
Incorporation country | Brazil |
Activity | Insurance |
Interest in voting capital | 100.00% | 99.99%
Interest in total capital | 100.00% | 99.99%
Country of domicile [member] | Itau Corretora de Valores S.A. [Member] |  |
Disclosure of subsidiaries [line items] |  |
Incorporation country | Brazil |
Activity | Broker |
Interest in voting capital | 100.00% | 100.00%
Interest in total capital | 100.00% | 100.00%
Country of domicile [member] | Itau Seguros S.A. [Member] |  |
Disclosure of subsidiaries [line items] |  |
Incorporation country | Brazil |
Activity | Insurance |
Interest in voting capital | 100.00% | 100.00%
Interest in total capital | 100.00% | 100.00%
Country of domicile [member] | Itau Unibanco SA [Member] |  |
Disclosure of subsidiaries [line items] |  |
Incorporation country | Brazil |
Activity | Financial institution |
Interest in voting capital | 100.00% | 100.00%
Interest in total capital | 100.00% | 100.00%
Country of domicile [member] | Itau Vida e Previdencia S.A. [Member] |  |
Disclosure of subsidiaries [line items] |  |
Incorporation country | Brazil |
Activity | Pension plan |
Interest in voting capital | 100.00% | 100.00%
Interest in total capital | 100.00% | 100.00%
Country of domicile [member] | Luizacred S.A. Sociedade de Credito, Financiamento e Investimento [Member] |  |
Disclosure of subsidiaries [line items] |  |
Incorporation country | Brazil |
Activity | Consumer finance credit |
Interest in voting capital | 50.00% | 50.00%
Interest in total capital | 50.00% | 50.00%
Country of domicile [member] | Redecard S.A. [Member] |  |
Disclosure of subsidiaries [line items] |  |
Incorporation country | Brazil |
Activity | Acquirer |
Interest in voting capital | 100.00% | 100.00%
Interest in total capital | 100.00% | 100.00%
Foreign [member] | Itau Corpbanca Colombia S.A. [Member] |  |
Disclosure of subsidiaries [line items] |  |
Functional currency | Colombian peso |
Incorporation country | Colombia |
Activity | Financial institution |
Interest in voting capital | 25.28% | 23.90%
Interest in total capital | 25.28% | 23.90%
Foreign [member] | Banco Itau Argentina S.A. [Member] |  |
Disclosure of subsidiaries [line items] |  |
Functional currency | Argentinian peso |
Incorporation country | Argentina |
Activity | Financial institution |
Interest in voting capital | 100.00% | 100.00%
Interest in total capital | 100.00% | 100.00%
Foreign [member] | Banco Itau Paraguay S.A. [Member] |  |
Disclosure of subsidiaries [line items] |  |
Functional currency | Guarani |
Incorporation country | Paraguay |
Activity | Financial institution |
Interest in voting capital | 100.00% | 100.00%
Interest in total capital | 100.00% | 100.00%
Foreign [member] | Banco Itau (Suisse) SA [Member] |  |
Disclosure of subsidiaries [line items] |  |
Functional currency | Swiss franc |
Incorporation country | Switzerland |
Activity | Financial institution |
Interest in voting capital | 100.00% | 100.00%
Interest in total capital | 100.00% | 100.00%
Foreign [member] | Banco Itau Uruguay S.A. [Member] |  |
Disclosure of subsidiaries [line items] |  |
Functional currency | Uruguayan peso |
Incorporation country | Uruguay |
Activity | Financial institution |
Interest in voting capital | 100.00% | 100.00%
Interest in total capital | 100.00% | 100.00%
Foreign [member] | Itau Bank, Ltd. [Member] |  |
Disclosure of subsidiaries [line items] |  |
Functional currency | Real |
Incorporation country | Cayman Islands |
Activity | Financial institution |
Interest in voting capital | 100.00% | 100.00%
Interest in total capital | 100.00% | 100.00%
Foreign [member] | Itau BBA Colombia S.A. Corporacion Financiera [Member] |  |
Disclosure of subsidiaries [line items] |  |
Functional currency | Colombian peso |
Incorporation country | Colombia |
Activity | Financial institution |
Interest in voting capital | 100.00% | 100.00%
Interest in total capital | 100.00% | 100.00%
Foreign [member] | Itau BBA International plc [Member] |  |
Disclosure of subsidiaries [line items] |  |
Functional currency | Dollar |
Incorporation country | United Kingdom |
Activity | Financial institution |
Interest in voting capital | 100.00% | 100.00%
Interest in total capital | 100.00% | 100.00%
Foreign [member] | Itau BBA USA Securities Inc. [Member] |  |
Disclosure of subsidiaries [line items] |  |
Functional currency | Real |
Incorporation country | United States |
Activity | Broker |
Interest in voting capital | 100.00% | 100.00%
Interest in total capital | 100.00% | 100.00%
Foreign [member] | Itau CorpBanca [Member] |  |
Disclosure of subsidiaries [line items] |  |
Functional currency | Chilean peso |
Incorporation country | Chile |
Activity | Financial institution |
Interest in voting capital | 38.14% | 36.06%
Interest in total capital | 38.14% | 36.06%

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