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Contingent Assets and Liabilities, Provisions and Legal Obligations - Additional Information (Detail) - BRL (R$)
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Jan. 01, 2017
Disclosure of Provisions [Line Items]        
Provisions R$ 18,613,000,000 R$ 19,736,000,000   R$ 20,909,000,000
Interest on capital (3,791,000,000) (3,873,000,000) R$ (3,617,000,000)  
Amounts related to banking operation 36,809,000,000 34,448,000,000 R$ 31,918,000,000  
Deductibility of losses in credit operations 33,373,000,000 36,737,000,000   R$ 36,763,000,000
Receivables balance arising from reimbursements of contingencies 999,000,000 1,065,000,000    
Civil lawsuits [Member]        
Disclosure of Provisions [Line Items]        
Total estimated risk 3,879,000,000 3,494,000,000    
Provisions 0      
Labor claims [Member]        
Disclosure of Provisions [Line Items]        
Total estimated risk 177,000,000 R$ 122,000,000    
Tax proceedings [member]        
Disclosure of Provisions [Line Items]        
Total estimated risk 27,530,000,000      
CSLL [Member]        
Disclosure of Provisions [Line Items]        
Provisions recognized for tax and social securities lawsuits 1,340,000,000      
Deposit balance R$ 1,324,000,000      
CSLL [Member] | Bottom of range [member]        
Disclosure of Provisions [Line Items]        
CSLL rate for financial and insurance companies 9.00%      
CSLL [Member] | Top of range [member]        
Disclosure of Provisions [Line Items]        
CSLL rate for financial and insurance companies 15.00%      
INSS [Member]        
Disclosure of Provisions [Line Items]        
Non-compensatory amounts R$ 5,373,000,000      
INSS [Member] | Social Security Contributions [Member]        
Disclosure of Provisions [Line Items]        
Non-compensatory amounts 660,000,000      
PIS and COFINS [Member]        
Disclosure of Provisions [Line Items]        
Provisions recognized for tax and social securities lawsuits 636,000,000      
Deposit balance 612,000,000      
Reversal of revenues from depreciation in excess 3,205,000,000      
Irpj Csll Pis And Cofins [Member]        
Disclosure of Provisions [Line Items]        
Funding expenses 3,930,000,000      
IRPJ and CSLL [Member]        
Disclosure of Provisions [Line Items]        
Goodwill - Deduction 2,704,000,000      
Interest on capital 1,510,000,000      
Deductibility of losses in credit operations 1,112,000,000      
Deductibility of losses in credit operations 757,000,000      
IRPJ [Member]        
Disclosure of Provisions [Line Items]        
Goodwill amount guaranteed in purchase agreements 1,695,000,000      
ISS [Member]        
Disclosure of Provisions [Line Items]        
Amounts related to banking operation R$ 1,166,000,000