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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, 2019
Dec. 31, 2018
Dec. 31, 2017
Disclosure Of Derivative Financial Instruments [Line Items]      
Assets R$ 41,854 R$ 23,466  
Liabilities (47,828) (27,519)  
Swap contract [member]      
Disclosure Of Derivative Financial Instruments [Line Items]      
Assets 26,458 13,093  
Liabilities (32,927) (19,516)  
Options contract [member]      
Disclosure Of Derivative Financial Instruments [Line Items]      
Assets 8,456 4,215  
Liabilities (9,061) (3,929)  
Forward contract [member]      
Disclosure Of Derivative Financial Instruments [Line Items]      
Assets 2,162 1,835  
Liabilities (754) (470)  
Credit derivatives financial institutions [member]      
Disclosure Of Derivative Financial Instruments [Line Items]      
Assets 167 120  
Liabilities (40) (140)  
NDF - Non deliverable forward [member]      
Disclosure Of Derivative Financial Instruments [Line Items]      
Assets 4,446 3,711  
Liabilities (4,971) (3,384)  
Other derivative financial instruments [Member]      
Disclosure Of Derivative Financial Instruments [Line Items]      
Assets 165 492  
Liabilities (75) (80)  
Level 1 [Member]      
Disclosure Of Derivative Financial Instruments [Line Items]      
Assets 14 15  
Liabilities (7) (22)  
Level 1 [Member] | Swap contract [member]      
Disclosure Of Derivative Financial Instruments [Line Items]      
Assets 0    
Liabilities 0    
Level 1 [Member] | Options contract [member]      
Disclosure Of Derivative Financial Instruments [Line Items]      
Assets 0    
Liabilities 0    
Level 1 [Member] | Forward contract [member]      
Disclosure Of Derivative Financial Instruments [Line Items]      
Assets 0    
Liabilities 0    
Level 1 [Member] | Credit derivatives financial institutions [member]      
Disclosure Of Derivative Financial Instruments [Line Items]      
Assets 0    
Liabilities 0    
Level 1 [Member] | NDF - Non deliverable forward [member]      
Disclosure Of Derivative Financial Instruments [Line Items]      
Assets 0    
Liabilities 0    
Level 1 [Member] | Other derivative financial instruments [Member]      
Disclosure Of Derivative Financial Instruments [Line Items]      
Assets 14 15  
Liabilities (7) (22)  
Level 2 [Member]      
Disclosure Of Derivative Financial Instruments [Line Items]      
Assets 41,737 23,309  
Liabilities (47,736) (27,471)  
Level 2 [Member] | Swap contract [member]      
Disclosure Of Derivative Financial Instruments [Line Items]      
Assets 26,426 13,003  
Liabilities (32,881) (19,513)  
Level 2 [Member] | Options contract [member]      
Disclosure Of Derivative Financial Instruments [Line Items]      
Assets 8,385 4,163  
Liabilities (9,022) (3,906)  
Level 2 [Member] | Forward contract [member]      
Disclosure Of Derivative Financial Instruments [Line Items]      
Assets 2,162 1,835  
Liabilities (754) (470)  
Level 2 [Member] | Credit derivatives financial institutions [member]      
Disclosure Of Derivative Financial Instruments [Line Items]      
Assets 167 120  
Liabilities (40) (140)  
Level 2 [Member] | NDF - Non deliverable forward [member]      
Disclosure Of Derivative Financial Instruments [Line Items]      
Assets 4,446 3,711  
Liabilities (4,971) (3,384)  
Level 2 [Member] | Other derivative financial instruments [Member]      
Disclosure Of Derivative Financial Instruments [Line Items]      
Assets 151 477  
Liabilities (68) (58)  
Level 3 [Member]      
Disclosure Of Derivative Financial Instruments [Line Items]      
Assets 103 142 R$ 436
Liabilities (85) (26) R$ (103)
Level 3 [Member] | Swap contract [member]      
Disclosure Of Derivative Financial Instruments [Line Items]      
Assets 32 90  
Liabilities (46) (3)  
Level 3 [Member] | Options contract [member]      
Disclosure Of Derivative Financial Instruments [Line Items]      
Assets 71 52  
Liabilities (39) (23)  
Level 3 [Member] | Forward contract [member]      
Disclosure Of Derivative Financial Instruments [Line Items]      
Assets 0    
Liabilities 0    
Level 3 [Member] | Credit derivatives financial institutions [member]      
Disclosure Of Derivative Financial Instruments [Line Items]      
Assets 0    
Liabilities 0    
Level 3 [Member] | NDF - Non deliverable forward [member]      
Disclosure Of Derivative Financial Instruments [Line Items]      
Assets 0    
Liabilities 0    
Level 3 [Member] | Other derivative financial instruments [Member]      
Disclosure Of Derivative Financial Instruments [Line Items]      
Assets 0 R$ 0  
Liabilities R$ 0