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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, 2019 | Dec. 31, 2018
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Disclosure of offsetting of financial assets [line items] |  |
Gross amount of recognized financial assets | R$ 41,854 | R$ 23,466
Net amount of financial assets presented in the statement of financial position | 41,854 | 23,466
Related amounts not offset in the statement of Financial position, financial instruments | (14,121) | (3,091)
Net amount | 27,733 | 20,375
Gross amount of recognized financial liabilities | 47,828 | 27,519
Net amount of financial assets presented in the statement of financial position | 47,828 | 27,519
Related amounts not offset in the statement of Financial position, financial instruments | (14,121) | (3,091)
Related amounts not offset in the statement of Financial position, cash collateral received | (148) | (333)
Net amount | 33,559 | 24,095
Securities purchased under agreements to resell [member] |  |
Disclosure of offsetting of financial assets [line items] |  |
Gross amount of recognized financial assets | 198,422 | 280,132
Net amount of financial assets presented in the statement of financial position | 198,422 | 280,132
Related amounts not offset in the statement of Financial position, financial instruments | (596) | (2,822)
Net amount | 197,826 | 277,310
Gross amount of recognized financial liabilities | 256,583 | 330,237
Net amount of financial assets presented in the statement of financial position | 256,583 | 330,237
Related amounts not offset in the statement of Financial position, financial instruments | (23,509) | (23,079)
Net amount | R$ 233,074 | R$ 307,158

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