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Segment Information - Summary of Operating Segments (Parenthetical) (Detail) - BRL (R$)
R$ in Millions
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Disclosure of operating segments [abstract]      
Interest and similar income and expenses R$ 64,325 R$ 62,565 R$ 67,311
Net gains (loss) on investment securities and derivatives 4,098 (4,834) 4,181
Results from foreign exchange operation 927 2,974 (250)
Depreciation and amortization expenses R$ (4,630) R$ (3,332) R$ (3,034)