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Risk and Capital Management- Summary of VaR Total - Historical Simulation (Detail) - BRL (R$)
R$ in Millions
Dec. 31, 2019
Dec. 31, 2018
Disclosure of Value at Risk historical simulation [Line Items]    
Risk factor group R$ 278.3 R$ 381.5
Interest rate risk [Member]    
Disclosure of Value at Risk historical simulation [Line Items]    
Risk factor group 813.1 898.4
Foreign exchange risk [member]    
Disclosure of Value at Risk historical simulation [Line Items]    
Risk factor group 10.9 37.3
Shares [member]    
Disclosure of Value at Risk historical simulation [Line Items]    
Risk factor group 29.4 50.1
Commodity price risk [member]    
Disclosure of Value at Risk historical simulation [Line Items]    
Risk factor group 1.0 1.0
Risk diversification effect [member]    
Disclosure of Value at Risk historical simulation [Line Items]    
Risk factor group (576.1) (605.3)
Average [Member]    
Disclosure of Value at Risk historical simulation [Line Items]    
Risk factor group 333.7 399.3
Average [Member] | Interest rate risk [Member]    
Disclosure of Value at Risk historical simulation [Line Items]    
Risk factor group 815.7 851.4
Average [Member] | Foreign exchange risk [member]    
Disclosure of Value at Risk historical simulation [Line Items]    
Risk factor group 27.6 24.7
Average [Member] | Shares [member]    
Disclosure of Value at Risk historical simulation [Line Items]    
Risk factor group 30.2 39.2
Average [Member] | Commodity price risk [member]    
Disclosure of Value at Risk historical simulation [Line Items]    
Risk factor group 1.8 1.6
Average [Member] | Risk diversification effect [member]    
Disclosure of Value at Risk historical simulation [Line Items]    
Risk factor group [1] 0.0  
Bottom of range [member]    
Disclosure of Value at Risk historical simulation [Line Items]    
Risk factor group 208.7 294.7
Bottom of range [member] | Interest rate risk [Member]    
Disclosure of Value at Risk historical simulation [Line Items]    
Risk factor group 651.6 720.0
Bottom of range [member] | Foreign exchange risk [member]    
Disclosure of Value at Risk historical simulation [Line Items]    
Risk factor group 10.9 12.7
Bottom of range [member] | Shares [member]    
Disclosure of Value at Risk historical simulation [Line Items]    
Risk factor group 13.5 23.6
Bottom of range [member] | Commodity price risk [member]    
Disclosure of Value at Risk historical simulation [Line Items]    
Risk factor group 0.5 0.6
Top of range [member]    
Disclosure of Value at Risk historical simulation [Line Items]    
Risk factor group 471.9 603.6
Top of range [member] | Interest rate risk [Member]    
Disclosure of Value at Risk historical simulation [Line Items]    
Risk factor group 959.7 1,042.9
Top of range [member] | Foreign exchange risk [member]    
Disclosure of Value at Risk historical simulation [Line Items]    
Risk factor group 59.2 45.2
Top of range [member] | Shares [member]    
Disclosure of Value at Risk historical simulation [Line Items]    
Risk factor group 57.4 58.5
Top of range [member] | Commodity price risk [member]    
Disclosure of Value at Risk historical simulation [Line Items]    
Risk factor group 4.7 R$ 3.1
Top of range [member] | Risk diversification effect [member]    
Disclosure of Value at Risk historical simulation [Line Items]    
Risk factor group [1] R$ 0.0  
[1] VaR by Group of Risk Factors considers information from foreign units.