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Hedge Accounting - Summary of Hedge of Net Investment in Foreign Operations (Detail) - BRL (R$)
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Disclosure of Detailed Information about Hedges [Line Items]      
Variation in value recognized in Other comprehensive income R$ (1,135,000,000) R$ (571,000,000) R$ (697,000,000)
Nominal Value 126,549,000,000 171,439,000,000  
Hedges of net investment in foreign operations [member]      
Disclosure of Detailed Information about Hedges [Line Items]      
Variation in value recognized in Other comprehensive income (7,300,000,000) (5,507,000,000)  
Nominal Value 12,550,000,000 10,561,000,000  
Foreign exchange risk [member]      
Disclosure of Detailed Information about Hedges [Line Items]      
Book Value, Assets 0 0  
Book Value, Liabilities 14,820,000,000 13,074,000,000  
Variation in value recognized in Other comprehensive income (7,300,000,000) (5,507,000,000)  
Foreign currency convertion (7,300,000,000) (5,507,000,000)  
Nominal Value 12,550,000,000 10,561,000,000  
Variation in the amounts used to calculate hedge ineffectiveness (7,296,000,000) (5,503,000,000)  
Foreign exchange risk [member] | Hedges of net investment in foreign operations [member]      
Disclosure of Detailed Information about Hedges [Line Items]      
Book Value, Assets 0 0  
Book Value, Liabilities 14,820,000,000 13,074,000,000  
Variation in value recognized in Other comprehensive income (7,300,000,000) (5,507,000,000)  
Foreign currency convertion (7,300,000,000) (5,507,000,000)  
Nominal Value 12,550,000,000 10,561,000,000  
Variation in the amounts used to calculate hedge ineffectiveness R$ (7,296,000,000) R$ (5,503,000,000)