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Securities Sold Under Repurchase Agreements and Interbank and Institutional Market Debts - Summary of Breakdown of Funds Obtained in Institutional Markets (Detail) - BRL (R$)
R$ in Millions
Dec. 31, 2018
Dec. 31, 2017
Jan. 01, 2017
Disclosure Of Repurchase Agreements [Line Items]      
Institutional market debt R$ 93,974 R$ 98,482 R$ 96,239
Subordinated debt [Member]      
Disclosure Of Repurchase Agreements [Line Items]      
Institutional market debt R$ 49,313 52,696  
Subordinated debt [Member] | Bottom of range [member]      
Disclosure Of Repurchase Agreements [Line Items]      
Interest rate for each operations 3.80%    
Subordinated debt [Member] | Top of range [member]      
Disclosure Of Repurchase Agreements [Line Items]      
Interest rate for each operations 4.63%    
Foreign borrowing through securities [Member]      
Disclosure Of Repurchase Agreements [Line Items]      
Institutional market debt R$ 41,863 41,400  
Foreign borrowing through securities [Member] | Bottom of range [member]      
Disclosure Of Repurchase Agreements [Line Items]      
Interest rate for each operations 0.89%    
Foreign borrowing through securities [Member] | Top of range [member]      
Disclosure Of Repurchase Agreements [Line Items]      
Interest rate for each operations 30.35%    
Structured Operations Certificates [Member]      
Disclosure Of Repurchase Agreements [Line Items]      
Institutional market debt R$ 2,798 4,386  
Structured Operations Certificates [Member] | Bottom of range [member]      
Disclosure Of Repurchase Agreements [Line Items]      
Interest rate for each operations 0.00%    
Structured Operations Certificates [Member] | Top of range [member]      
Disclosure Of Repurchase Agreements [Line Items]      
Interest rate for each operations 15.82%    
Current [Member]      
Disclosure Of Repurchase Agreements [Line Items]      
Institutional market debt R$ 8,524 26,026  
Current [Member] | Subordinated debt [Member]      
Disclosure Of Repurchase Agreements [Line Items]      
Institutional market debt 343 12,500  
Current [Member] | Foreign borrowing through securities [Member]      
Disclosure Of Repurchase Agreements [Line Items]      
Institutional market debt 6,232 11,764  
Current [Member] | Structured Operations Certificates [Member]      
Disclosure Of Repurchase Agreements [Line Items]      
Institutional market debt 1,949 1,762  
Non-current [Member]      
Disclosure Of Repurchase Agreements [Line Items]      
Institutional market debt 85,450 72,456  
Non-current [Member] | Subordinated debt [Member]      
Disclosure Of Repurchase Agreements [Line Items]      
Institutional market debt 48,970 40,196  
Non-current [Member] | Foreign borrowing through securities [Member]      
Disclosure Of Repurchase Agreements [Line Items]      
Institutional market debt 35,631 29,636  
Non-current [Member] | Structured Operations Certificates [Member]      
Disclosure Of Repurchase Agreements [Line Items]      
Institutional market debt R$ 849 R$ 2,624