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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
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