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Fair Value of Financial Instruments - Summary of Breakdown of Fair Value Hierarchy Levels for Derivative Assets and Liabilities (Detail) - BRL (R$)
R$ in Millions
Dec. 31, 2018
Dec. 31, 2017
Jan. 01, 2017
Dec. 31, 2016
Disclosure Of Derivative Financial Instruments [Line Items]        
Assets R$ 23,466 R$ 22,843 R$ 24,231  
Liabilities (27,519) (26,746) R$ (24,698)  
Futures [Member]        
Disclosure Of Derivative Financial Instruments [Line Items]        
Assets   158    
Swap [member]        
Disclosure Of Derivative Financial Instruments [Line Items]        
Assets 13,049 9,190    
Liabilities (19,354) (13,692)    
Options [Member]        
Disclosure Of Derivative Financial Instruments [Line Items]        
Assets 4,215 3,337    
Liabilities (3,929) (2,793)    
Forward [member]        
Disclosure Of Derivative Financial Instruments [Line Items]        
Assets 1,835 6,911    
Liabilities (470) (6,272)    
Credit derivatives financial institutions [member]        
Disclosure Of Derivative Financial Instruments [Line Items]        
Assets 120 137    
Liabilities (140) (58)    
Non deliverable forward [member]        
Disclosure Of Derivative Financial Instruments [Line Items]        
Assets 3,711 2,950    
Liabilities (3,384) (3,745)    
Check of swap companies [member]        
Disclosure Of Derivative Financial Instruments [Line Items]        
Assets 44 68    
Liabilities (162) (122)    
Other derivative financial instruments [Member]        
Disclosure Of Derivative Financial Instruments [Line Items]        
Assets 492 92    
Liabilities (80) (64)    
Level 1 [Member]        
Disclosure Of Derivative Financial Instruments [Line Items]        
Assets 15 158    
Liabilities (22)      
Level 1 [Member] | Futures [Member]        
Disclosure Of Derivative Financial Instruments [Line Items]        
Assets   158    
Level 1 [Member] | Other derivative financial instruments [Member]        
Disclosure Of Derivative Financial Instruments [Line Items]        
Assets 15      
Liabilities (22)      
Level 2 [Member]        
Disclosure Of Derivative Financial Instruments [Line Items]        
Assets 23,309 22,249    
Liabilities (27,471) (26,643)    
Level 2 [Member] | Swap [member]        
Disclosure Of Derivative Financial Instruments [Line Items]        
Assets 12,959 8,821    
Liabilities (19,351) (13,590)    
Level 2 [Member] | Options [Member]        
Disclosure Of Derivative Financial Instruments [Line Items]        
Assets 4,163 3,271    
Liabilities (3,906) (2,792)    
Level 2 [Member] | Forward [member]        
Disclosure Of Derivative Financial Instruments [Line Items]        
Assets 1,835 6,911    
Liabilities (470) (6,272)    
Level 2 [Member] | Credit derivatives financial institutions [member]        
Disclosure Of Derivative Financial Instruments [Line Items]        
Assets 120 137    
Liabilities (140) (58)    
Level 2 [Member] | Non deliverable forward [member]        
Disclosure Of Derivative Financial Instruments [Line Items]        
Assets 3,711 2,950    
Liabilities (3,384) (3,745)    
Level 2 [Member] | Check of swap companies [member]        
Disclosure Of Derivative Financial Instruments [Line Items]        
Assets 44 68    
Liabilities (162) (122)    
Level 2 [Member] | Other derivative financial instruments [Member]        
Disclosure Of Derivative Financial Instruments [Line Items]        
Assets 477 91    
Liabilities (58) (64)    
Level 3 [Member]        
Disclosure Of Derivative Financial Instruments [Line Items]        
Assets 142 436   R$ 521
Liabilities (26) (103)   R$ 60
Level 3 [Member] | Swap [member]        
Disclosure Of Derivative Financial Instruments [Line Items]        
Assets 90 369    
Liabilities (3) (102)    
Level 3 [Member] | Options [Member]        
Disclosure Of Derivative Financial Instruments [Line Items]        
Assets 52 66    
Liabilities R$ (23) (1)    
Level 3 [Member] | Other derivative financial instruments [Member]        
Disclosure Of Derivative Financial Instruments [Line Items]        
Assets   R$ 1