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