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Risk and Capital Management- Summary of VaR Total - Historical Simulation (Detail) - BRL (R$)
R$ in Millions
Dec. 31, 2018
Dec. 31, 2017
Disclosure of Value at Risk historical simulation [Line Items]    
Risk factor group R$ 381.5 R$ 372.3
Interest rate risk [Member]    
Disclosure of Value at Risk historical simulation [Line Items]    
Risk factor group 898.4 764.7
Foreign exchange risk [member]    
Disclosure of Value at Risk historical simulation [Line Items]    
Risk factor group 37.3 11.9
Shares [member]    
Disclosure of Value at Risk historical simulation [Line Items]    
Risk factor group 50.1 46.4
Commodity price risk [member]    
Disclosure of Value at Risk historical simulation [Line Items]    
Risk factor group 1.0 0.8
Risk diversification effect [member]    
Disclosure of Value at Risk historical simulation [Line Items]    
Risk factor group (605.3) (451.5)
Average [Member]    
Disclosure of Value at Risk historical simulation [Line Items]    
Risk factor group 399.3 409.9
Average [Member] | Interest rate risk [Member]    
Disclosure of Value at Risk historical simulation [Line Items]    
Risk factor group 851.4 721.0
Average [Member] | Foreign exchange risk [member]    
Disclosure of Value at Risk historical simulation [Line Items]    
Risk factor group 24.7 20.4
Average [Member] | Shares [member]    
Disclosure of Value at Risk historical simulation [Line Items]    
Risk factor group 39.2 45.4
Average [Member] | Commodity price risk [member]    
Disclosure of Value at Risk historical simulation [Line Items]    
Risk factor group 1.6 1.5
Bottom of range [member]    
Disclosure of Value at Risk historical simulation [Line Items]    
Risk factor group 294.7 304.8
Bottom of range [member] | Interest rate risk [Member]    
Disclosure of Value at Risk historical simulation [Line Items]    
Risk factor group 720.0 583.6
Bottom of range [member] | Foreign exchange risk [member]    
Disclosure of Value at Risk historical simulation [Line Items]    
Risk factor group 12.7 6.5
Bottom of range [member] | Shares [member]    
Disclosure of Value at Risk historical simulation [Line Items]    
Risk factor group 23.6 38.5
Bottom of range [member] | Commodity price risk [member]    
Disclosure of Value at Risk historical simulation [Line Items]    
Risk factor group 0.6 0.7
Top of range [member]    
Disclosure of Value at Risk historical simulation [Line Items]    
Risk factor group 603.6 874.0
Top of range [member] | Interest rate risk [Member]    
Disclosure of Value at Risk historical simulation [Line Items]    
Risk factor group 1,042.9 1,311.9
Top of range [member] | Foreign exchange risk [member]    
Disclosure of Value at Risk historical simulation [Line Items]    
Risk factor group 45.2 50.2
Top of range [member] | Shares [member]    
Disclosure of Value at Risk historical simulation [Line Items]    
Risk factor group 58.5 54.9
Top of range [member] | Commodity price risk [member]    
Disclosure of Value at Risk historical simulation [Line Items]    
Risk factor group R$ 3.1 R$ 4.0