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Contingent Assets and Liabilities, Provisions and Legal Obligations - Summary of Assets Pledged as Collateral for Lawsuits Involving Contingent Liabilities are Restricted or Deposited (Detail) - Guarantees Of Contingencies Provisions And Legal Obligations [Member] - BRL (R$)
R$ in Millions
Dec. 31, 2019
Dec. 31, 2018
Disclosure of contingent liabilities [line items]    
Deposits in guarantee (Note 18a) R$ 14,520 R$ 13,534
Quotas 1,148 2,169
Surety 3,223 1,880
Insurance bond 14,867 12,103
Guarantee by government securities 96 539
Total 33,854 R$ 30,225
Civil [Member]    
Disclosure of contingent liabilities [line items]    
Deposits in guarantee (Note 18a) 1,532  
Quotas 647  
Surety 60  
Insurance bond 1,678  
Guarantee by government securities 17  
Total 3,934  
Labour [Member]    
Disclosure of contingent liabilities [line items]    
Deposits in guarantee (Note 18a) 2,378  
Quotas 418  
Surety 63  
Insurance bond 914  
Guarantee by government securities 0  
Total 3,773  
Tax [Member]    
Disclosure of contingent liabilities [line items]    
Deposits in guarantee (Note 18a) 10,610  
Quotas 83  
Surety 3,100  
Insurance bond 12,275  
Guarantee by government securities 79  
Total R$ 26,147