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Derivatives - Schedule of Financial Assets subject to Offsetting, Enforceable Master Netting Arrangements and Similar Agreements (Detail) - BRL (R$) R$ in Millions | Dec. 31, 2021 | Dec. 31, 2020
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Disclosure of offsetting of financial assets [line items] |  |
Gross amount of recognized financial assets | R$ 69,045 | R$ 76,504
Net amount of financial assets presented in the statement of financial position | 69,045 | 76,504
Related amounts not offset in the statement of Financial position, financial instruments | (14,517) | (15,621)
Related amounts not offset in the statement of Financial position, cash collateral received | (217) |
Net amount | 54,311 | 60,883
Gross amount of recognized financial liabilities | 63,204 | 79,505
Net amount of financial assets presented in the statement of financial position | 63,204 | 79,505
Related amounts not offset in the statement of Financial position, financial instruments | (14,517) | (15,621)
Related amounts not offset in the statement of Financial position, cash collateral received | 0 | (574)
Net amount | 48,687 | 63,310
Securities purchased under agreements to resell [member] |  |
Disclosure of offsetting of financial assets [line items] |  |
Gross amount of recognized financial assets | 169,711 | 239,935
Net amount of financial assets presented in the statement of financial position | 169,711 | 239,935
Related amounts not offset in the statement of Financial position, financial instruments | (3,649) | (1,657)
Net amount | 166,062 | 238,278
Gross amount of recognized financial liabilities | 252,848 | 273,364
Net amount of financial assets presented in the statement of financial position | 252,848 | 273,364
Related amounts not offset in the statement of Financial position, financial instruments | (39,317) | (42,161)
Net amount | R$ 213,531 | R$ 231,203

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