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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, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Disclosure of operating segments [abstract] |  |  |
Interest and similar income and expenses | R$ 62,565 | R$ 67,311 | R$ 67,276
Net gains (loss) on investment securities and derivatives | (4,834) | 4,181 | 7,066
Results from foreign exchange operation | 2,974 | (250) | 5,513
Depreciation and amortization expenses | R$ 3,332 | R$ 3,034 | R$ 2,995

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