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Risk and Capital Management - Summary of Internal Rating (Detail) - BRL (R$)
R$ in Millions
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Disclosure of Credit Quality [Line Items]    
Loan operations and lease operations portfolio R$ 585,791 R$ 536,091
Percentage of loan operations and lease operations portfolio 100.00% 100.00%
Lower risk [Member]    
Disclosure of Credit Quality [Line Items]    
Loan operations and lease operations portfolio R$ 425,140 R$ 390,382
Satisfactory [Member]    
Disclosure of Credit Quality [Line Items]    
Loan operations and lease operations portfolio 97,977 92,644
Higher Risk [Member]    
Disclosure of Credit Quality [Line Items]    
Loan operations and lease operations portfolio 20,692 13,494
Credit impaired [member]    
Disclosure of Credit Quality [Line Items]    
Loan operations and lease operations portfolio 41,982 39,571
Stage 1 [member]    
Disclosure of Credit Quality [Line Items]    
Loan operations and lease operations portfolio R$ 501,889 R$ 459,626
Percentage of loan operations and lease operations portfolio 85.60% 85.70%
Stage 1 [member] | Lower risk [Member]    
Disclosure of Credit Quality [Line Items]    
Loan operations and lease operations portfolio R$ 420,936 R$ 385,846
Stage 1 [member] | Satisfactory [Member]    
Disclosure of Credit Quality [Line Items]    
Loan operations and lease operations portfolio 80,106 72,921
Stage 1 [member] | Higher Risk [Member]    
Disclosure of Credit Quality [Line Items]    
Loan operations and lease operations portfolio 847 859
Stage 1 [member] | Credit impaired [member]    
Disclosure of Credit Quality [Line Items]    
Loan operations and lease operations portfolio 0  
Stage 2 [member]    
Disclosure of Credit Quality [Line Items]    
Loan operations and lease operations portfolio R$ 41,920 R$ 36,894
Percentage of loan operations and lease operations portfolio 7.20% 6.90%
Stage 2 [member] | Lower risk [Member]    
Disclosure of Credit Quality [Line Items]    
Loan operations and lease operations portfolio R$ 4,204 R$ 4,536
Stage 2 [member] | Satisfactory [Member]    
Disclosure of Credit Quality [Line Items]    
Loan operations and lease operations portfolio 17,871 19,723
Stage 2 [member] | Higher Risk [Member]    
Disclosure of Credit Quality [Line Items]    
Loan operations and lease operations portfolio 19,845 12,635
Stage 2 [member] | Credit impaired [member]    
Disclosure of Credit Quality [Line Items]    
Loan operations and lease operations portfolio 0  
Stage 3 [member]    
Disclosure of Credit Quality [Line Items]    
Loan operations and lease operations portfolio R$ 41,982 R$ 39,571
Percentage of loan operations and lease operations portfolio 7.20% 7.40%
Stage 3 [member] | Lower risk [Member]    
Disclosure of Credit Quality [Line Items]    
Loan operations and lease operations portfolio R$ 0  
Stage 3 [member] | Satisfactory [Member]    
Disclosure of Credit Quality [Line Items]    
Loan operations and lease operations portfolio 0  
Stage 3 [member] | Higher Risk [Member]    
Disclosure of Credit Quality [Line Items]    
Loan operations and lease operations portfolio 0  
Stage 3 [member] | Credit impaired [member]    
Disclosure of Credit Quality [Line Items]    
Loan operations and lease operations portfolio R$ 41,982 R$ 39,571