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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, 2018 | Dec. 31, 2017
--- | --- | ---
Disclosure of offsetting of financial assets [line items] |  |
Net amount of financial assets presented in the statement of financial position | R$ 23,466 | R$ 22,843
Net amount of financial assets presented in the statement of financial position | 27,519 | 26,746
Securities purchased under agreements to resell [Member] |  |
Disclosure of offsetting of financial assets [line items] |  |
Gross amount of recognized financial assets | 280,126 | 244,699
Gross amount offset in the statement of financial position | 0 | 0
Net amount of financial assets presented in the statement of financial position | 280,126 | 244,699
Related amounts not offset in the statement of Financial position, financial instruments | (2,822) | (575)
Related amounts not offset in the statement of Financial position, cash collateral received | 0 | 0
Net amount | 277,304 | 244,124
Gross amount of recognized financial liabilities | 330,237 | 312,634
Gross amount offset in the statement of financial position | 0 | 0
Net amount of financial assets presented in the statement of financial position | 330,237 | 312,634
Related amounts not offset in the statement of Financial position, financial instruments | (23,079) | (14,489)
Net amount | 307,158 | 298,145
Derivatives [member] |  |
Disclosure of offsetting of financial assets [line items] |  |
Gross amount of recognized financial assets | 23,466 | 22,843
Gross amount offset in the statement of financial position | 0 | 0
Net amount of financial assets presented in the statement of financial position | 23,466 | 22,843
Related amounts not offset in the statement of Financial position, financial instruments | (3,091) | (3,138)
Related amounts not offset in the statement of Financial position, cash collateral received | 0 | 0
Net amount | 20,375 | 19,705
Gross amount of recognized financial liabilities | 27,519 | 26,746
Gross amount offset in the statement of financial position | 0 | 0
Net amount of financial assets presented in the statement of financial position | 27,519 | 26,746
Related amounts not offset in the statement of Financial position, financial instruments | (3,091) | (3,138)
Related amounts not offset in the statement of Financial position, cash collateral received | (333) | (452)
Net amount | R$ 24,095 | R$ 23,156

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