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Deposits - Summary of Breakdown of Deposits (Detail) - BRL (R$)
R$ in Millions
Dec. 31, 2018
Dec. 31, 2017
Jan. 01, 2017
Disclosure of deposits [Line Items]      
Current R$ 307,832 R$ 273,339  
Non-current 155,592 129,599  
Total 463,424 402,938 R$ 329,414
Interest-bearing deposits [Member]      
Disclosure of deposits [Line Items]      
Current 235,248 204,363  
Non-current 155,592 129,599  
Total 390,840 333,962  
Time deposits [Member]      
Disclosure of deposits [Line Items]      
Current 95,914 82,718  
Non-current 155,386 129,082  
Total 251,300 211,800  
Interbank [member]      
Disclosure of deposits [Line Items]      
Current 2,469 1,665  
Non-current 206 517  
Total 2,675 2,182  
Savings accounts [member]      
Disclosure of deposits [Line Items]      
Current 136,865 119,980  
Total 136,865 119,980  
Non-interest bearing deposits [Member]      
Disclosure of deposits [Line Items]      
Current 72,584 68,976  
Total 72,584 68,976  
Demand deposits [Member]      
Disclosure of deposits [Line Items]      
Current 72,581 68,973  
Total 72,581 68,973  
Other [Member]      
Disclosure of deposits [Line Items]      
Current 3 3  
Total R$ 3 R$ 3