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Risk and Capital Management - Maximum Exposure of Other financial assets Segregated by Business Sector (Detail) - BRL (R$)
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Disclosure of credit risk exposure [line items]    
Other financial assets R$ 752,920,000,000 R$ 705,674,000,000
Other financial assets percentage 100.00% 100.00%
Public sector [Member]    
Disclosure of credit risk exposure [line items]    
Other financial assets R$ 330,730,000,000 R$ 327,932,000,000
Other financial assets percentage 43.90% 46.50%
Services [Member]    
Disclosure of credit risk exposure [line items]    
Other financial assets R$ 92,562,000,000 R$ 84,191,000,000
Other financial assets percentage 12.30% 11.90%
Other sectors [Member]    
Disclosure of credit risk exposure [line items]    
Other financial assets R$ 23,072,000,000 R$ 19,804,000,000
Other financial assets percentage 3.10% 2.80%
Financial [Member]    
Disclosure of credit risk exposure [line items]    
Other financial assets R$ 306,556,000,000 R$ 273,747,000,000
Other financial assets percentage 40.70% 38.80%