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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 income (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 Income [Line Items] |  |  |
Interest and similar income | R$ 129,253 | R$ 114,369 | R$ 118,151
Compulsory deposits in the Central Bank of Brazil [member] |  |  |
Disclosure Of Interest Income [Line Items] |  |  |
Interest and similar income | 3,613 | 2,242 | 4,734
Interbank deposits [member] |  |  |
Disclosure Of Interest Income [Line Items] |  |  |
Interest and similar income | 1,203 | 1,102 | 1,173
Securities purchased under agreements to resell [member] |  |  |
Disclosure Of Interest Income [Line Items] |  |  |
Interest and similar income | 9,812 | 9,832 | 16,197
Financial assets at fair value through other comprehensive income [member] |  |  |
Disclosure Of Interest Income [Line Items] |  |  |
Interest and similar income | 17,193 | 18,089 | 11,386
Financial assets at amortized cost [member] |  |  |
Disclosure Of Interest Income [Line Items] |  |  |
Interest and similar income | 4,820 | 3,629 | 2,582
Loan operations [member] |  |  |
Disclosure Of Interest Income [Line Items] |  |  |
Interest and similar income | 92,789 | 79,503 | 81,046
Other financial assets [member] |  |  |
Disclosure Of Interest Income [Line Items] |  |  |
Interest and similar income | R$ (177) | R$ (28) | R$ 1,033

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