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Contingent Assets and Liabilities, Provisions and Legal Obligations - Additional Information (Detail) - BRL (R$)
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Disclosure of Provisions [Line Items]      
Provisions R$ 21,454,000,000 R$ 18,613,000,000  
Amounts related to banking operation 39,032,000,000 36,809,000,000 R$ 34,448,000,000
Deductibility of losses in credit operations 36,029,000,000 33,373,000,000  
Receivables balance arising from reimbursements of contingencies 978,000,000 999,000,000  
Civil lawsuits [Member]      
Disclosure of Provisions [Line Items]      
Total estimated risk 4,264,000,000 3,879,000,000  
Provisions 0    
Labor claims [Member]      
Disclosure of Provisions [Line Items]      
Total estimated risk 251,000,000 R$ 177,000,000  
Tax proceedings [member]      
Disclosure of Provisions [Line Items]      
Total estimated risk 28,959,000,000    
CSLL [Member]      
Disclosure of Provisions [Line Items]      
Provisions recognized for tax and social securities lawsuits 1,389,000,000    
Deposit balance R$ 1,379,000,000    
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$ 5,009,000,000    
INSS [Member] | Social Security Contributions [Member]      
Disclosure of Provisions [Line Items]      
Deposit balance 671,000,000    
Non-compensatory amounts 1,913,000,000    
PIS and COFINS [Member]      
Disclosure of Provisions [Line Items]      
Provisions recognized for tax and social securities lawsuits 640,000,000    
Deposit balance 611,000,000    
Reversal of revenues from depreciation in excess 2,199,000,000    
Irpj Csll Pis And Cofins [Member]      
Disclosure of Provisions [Line Items]      
Funding expenses 4,115,000,000    
IRPJ and CSLL [Member]      
Disclosure of Provisions [Line Items]      
Goodwill - Deduction 3,307    
Deductibility of losses in credit operations 1,164,000,000    
Deductibility of losses in credit operations 685,000,000    
IRPJ [Member]      
Disclosure of Provisions [Line Items]      
Goodwill amount guaranteed in purchase agreements 1,762,000,000    
ISS [Member]      
Disclosure of Provisions [Line Items]      
Amounts related to banking operation R$ 3,239,000,000