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Stockholders' equity - Summary of Non-controlling Interests (Detail) - BRL (R$) R$ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
Disclosure of noncontrolling interests [Line Items] |  |  |
Non-controlling interests | R$ 11,612 | R$ 11,532 |
Income | 1,624 | (3,832) | R$ 700
Itau CorpBanca [Member] |  |  |
Disclosure of noncontrolling interests [Line Items] |  |  |
Non-controlling interests | 9,836 | 9,891 |
Income | 1,310 | (4,135) | 504
Itau Corpbanca Colombia S.A. [Member] |  |  |
Disclosure of noncontrolling interests [Line Items] |  |  |
Non-controlling interests | 476 | 491 |
Income | 38 | (15) | (16)
Financeira Itau CBD S.A. Credito, Financiamento e Investimento [Member] |  |  |
Disclosure of noncontrolling interests [Line Items] |  |  |
Non-controlling interests | 666 | 580 |
Income | 131 | 164 | 131
Luizacred S A Soc Cred Financiamento Investimento [member] |  |  |
Disclosure of noncontrolling interests [Line Items] |  |  |
Non-controlling interests | 426 | 385 |
Income | 76 | 102 | 20
Others [Member] |  |  |
Disclosure of noncontrolling interests [Line Items] |  |  |
Non-controlling interests | 208 | 185 |
Income | R$ 69 | R$ 52 | R$ 61

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