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Interest and similar income and expenses and Income of financial assets and liabilities at fair value through profit or loss - Summary of Interest and Similar Expense (Detail) - BRL (R$) R$ in Millions | 12 Months Ended
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Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
Disclosure Of Interest Expense [Line items] |  |  |
Interest and similar expense | R$ (69,305) | R$ (73,558) | R$ (75,958)
Deposits [member] |  |  |
Disclosure Of Interest Expense [Line items] |  |  |
Interest and similar expense | (20,492) | (17,478) | (18,559)
Securities sold under repurchase agreements [member] |  |  |
Disclosure Of Interest Expense [Line items] |  |  |
Interest and similar expense | (8,635) | (10,690) | (20,473)
Interbank market funds [member] |  |  |
Disclosure Of Interest Expense [Line items] |  |  |
Interest and similar expense | (24,929) | (28,878) | (13,231)
Institutional market funds [member] |  |  |
Disclosure Of Interest Expense [Line items] |  |  |
Interest and similar expense | (9,865) | (8,400) | (6,837)
Financial expense from technical provisions for insurance and private pension [member] |  |  |
Disclosure Of Interest Expense [Line items] |  |  |
Interest and similar expense | (5,346) | (8,121) | (16,720)
Other [member] |  |  |
Disclosure Of Interest Expense [Line items] |  |  |
Interest and similar expense | R$ (38) | R$ 9 | R$ (138)

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