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Segment Information - Summary of Operating Segments (Parenthetical) (Detail) - BRL (R$) R$ in Millions | 12 Months Ended
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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)

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