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Goodwill and Intangible Assets - Additional Information (Detail) - BRL (R$) R$ in Millions | Dec. 31, 2020 | Jun. 30, 2020
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Chile [member] |  |
Disclosure of detailed information about intangible assets [line items] |  |
Discount rate used for ascertaining impairment |  | 10.40%
Long term interest rate |  | 5.20%
Colombia [member] |  |
Disclosure of detailed information about intangible assets [line items] |  |
Discount rate used for ascertaining impairment |  | 12.30%
Long term interest rate |  | 6.50%
Itau Corpbanca [Member] |  |
Disclosure of detailed information about intangible assets [line items] |  |
Reoverable amount of cash |  | R$ 789
Goodwill [member] |  |
Disclosure of detailed information about intangible assets [line items] |  |
Reoverable amount of cash |  | R$ 5,772
Goodwill [member] | Itau Banca [Member] |  |
Disclosure of detailed information about intangible assets [line items] |  |
Reoverable amount of cash | R$ 3,375 |
Promotion and offer of financial products and service [Member] | Itau Corpbanca [Member] |  |
Disclosure of detailed information about intangible assets [line items] |  |
Reoverable amount of cash | R$ 3,606 |

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