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Stockholders' Equity - Summary of Non-controlling Interests (Detail) - BRL (R$) R$ in Millions | 12 Months Ended |
--- | --- | ---
Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016 | Jan. 01, 2017
Disclosure of noncontrolling interests [Line Items] |  |  |  |
Non-controlling interests | R$ 13,684 | R$ 12,978 |  | R$ 12,289
Net Income | 732 | 32 | R$ 389 |
Itau CorpBanca [Member] |  |  |  |
Disclosure of noncontrolling interests [Line Items] |  |  |  |
Non-controlling interests | 11,645 | 11,144 |  |
Net Income | 539 | (38) |  |
Itau Corpbanca Colombia S.A. [Member] |  |  |  |
Disclosure of noncontrolling interests [Line Items] |  |  |  |
Non-controlling interests | 1,268 | 1,203 |  |
Net Income | (2) | (50) |  |
Financeira Itau CBD S.A. Credito, Financiamento e Investimento [Member] |  |  |  |
Disclosure of noncontrolling interests [Line Items] |  |  |  |
Non-controlling interests | 364 | 297 |  |
Net Income | 105 | 70 |  |
Luizacred S A Soc Cred Financiamento Investimento [member] |  |  |  |
Disclosure of noncontrolling interests [Line Items] |  |  |  |
Non-controlling interests | 288 | 241 |  |
Net Income | 44 | 24 |  |
Others [Member] |  |  |  |
Disclosure of noncontrolling interests [Line Items] |  |  |  |
Non-controlling interests | 119 | 93 |  |
Net Income | R$ 46 | R$ 26 |  |

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