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Risk and Capital Management - Summary of Sensitivity Analysis Impact in Results and Stockholder's Equity (Detail) - BRL (R$)
R$ in Millions
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Disclosure of risk management strategy related to hedge accounting [line items]      
Private Pension R$ 20,136 R$ 22,177 R$ 19,490
5% increase in mortality rates [Member]      
Disclosure of risk management strategy related to hedge accounting [line items]      
Private Pension 15 24  
Insurance (1)    
5% decrease in mortality rates [Member]      
Disclosure of risk management strategy related to hedge accounting [line items]      
Private Pension (16) (25)  
Insurance (1) (1)  
0.1% increase in risk-free interest rates [Member]      
Disclosure of risk management strategy related to hedge accounting [line items]      
Private Pension 30 26  
Insurance 8 5  
0.1% decrease in risk-free interest rates [Member]      
Disclosure of risk management strategy related to hedge accounting [line items]      
Private Pension (44) (27)  
Insurance (8) (5)  
5% increase in conversion in income rates [Member]      
Disclosure of risk management strategy related to hedge accounting [line items]      
Private Pension (14) (13)  
5% decrease in conversion in income rates [Member]      
Disclosure of risk management strategy related to hedge accounting [line items]      
Private Pension 14 13  
5% increase in claims [Member]      
Disclosure of risk management strategy related to hedge accounting [line items]      
Insurance (37) (36)  
5% decrease in claims [Member]      
Disclosure of risk management strategy related to hedge accounting [line items]      
Insurance R$ 37 R$ 36