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Risk and Capital Management - Summary of Internal Rating (Detail) - BRL (R$)
R$ in Millions
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Disclosure of Credit Quality [Line Items]    
Loan operations and lease operations portfolio R$ 536,091 R$ 497,719
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$ 382,925 R$ 354,628
Satisfactory [Member]    
Disclosure of Credit Quality [Line Items]    
Loan operations and lease operations portfolio 92,644 78,505
Higher Risk [Member]    
Disclosure of Credit Quality [Line Items]    
Loan operations and lease operations portfolio 20,951 21,147
Credit impaired [member]    
Disclosure of Credit Quality [Line Items]    
Loan operations and lease operations portfolio 39,571 44,439
Stage 1 [Member]    
Disclosure of Credit Quality [Line Items]    
Loan operations and lease operations portfolio R$ 459,626 R$ 417,386
Percentage of loan operations and lease operations portfolio 85.70% 83.90%
Stage 1 [Member] | Lower risk [Member]    
Disclosure of Credit Quality [Line Items]    
Loan operations and lease operations portfolio R$ 378,389 R$ 349,354
Stage 1 [Member] | Satisfactory [Member]    
Disclosure of Credit Quality [Line Items]    
Loan operations and lease operations portfolio 72,921 60,707
Stage 1 [Member] | Higher Risk [Member]    
Disclosure of Credit Quality [Line Items]    
Loan operations and lease operations portfolio 8,316 7,325
Stage 2 [Member]    
Disclosure of Credit Quality [Line Items]    
Loan operations and lease operations portfolio R$ 36,894 R$ 35,894
Percentage of loan operations and lease operations portfolio 6.90% 7.20%
Stage 2 [Member] | Lower risk [Member]    
Disclosure of Credit Quality [Line Items]    
Loan operations and lease operations portfolio R$ 4,536 R$ 5,274
Stage 2 [Member] | Satisfactory [Member]    
Disclosure of Credit Quality [Line Items]    
Loan operations and lease operations portfolio 19,723 17,798
Stage 2 [Member] | Higher Risk [Member]    
Disclosure of Credit Quality [Line Items]    
Loan operations and lease operations portfolio 12,635 12,822
Stage 3 [Member]    
Disclosure of Credit Quality [Line Items]    
Loan operations and lease operations portfolio R$ 39,571 R$ 44,439
Percentage of loan operations and lease operations portfolio 7.40% 8.90%
Stage 3 [Member] | Credit impaired [member]    
Disclosure of Credit Quality [Line Items]    
Loan operations and lease operations portfolio R$ 39,571 R$ 44,439