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Hedge Accounting - Summary of Hedge Instrument of Net Investment in Foreign (Detail) - BRL (R$)
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Disclosure of Detailed Information about Hedges [Line Items]      
Nominal Value R$ 126,549,000,000 R$ 171,439,000,000  
Variation in value recognized in Other comprehensive income (1,135,000,000) (571,000,000) R$ (697,000,000)
Foreign exchange risk [member]      
Disclosure of Detailed Information about Hedges [Line Items]      
Nominal Value 12,550,000,000 10,561,000,000  
Variation in value recognized in Other comprehensive income (7,300,000,000) (5,507,000,000)  
Hedges of net investment in foreign operations [member]      
Disclosure of Detailed Information about Hedges [Line Items]      
Nominal Value 12,550,000,000 10,561,000,000  
Book Value, Assets 2,117,000,000 1,640,000,000  
Book value, Liabilities 113,000,000 357,000,000  
Variations in fair value used to calculate hedge ineffectiveness (7,296,000,000) (5,503,000,000)  
Variation in value recognized in Other comprehensive income (7,300,000,000) (5,507,000,000)  
Hedge ineffectiveness recognized in income 4,000,000 4,000,000  
Amount reclassified from foreign currency convertion into income 0 0  
Hedges of net investment in foreign operations [member] | Foreign exchange risk [member]      
Disclosure of Detailed Information about Hedges [Line Items]      
Nominal Value 12,550,000,000 10,561,000,000  
Variation in value recognized in Other comprehensive income (7,300,000,000) (5,507,000,000)  
Hedges of net investment in foreign operations [member] | Foreign exchange risk [member] | Forward [member]      
Disclosure of Detailed Information about Hedges [Line Items]      
Nominal Value 1,470,000,000 1,065,000,000  
Book Value, Assets 1,059,000,000 1,050,000,000  
Variations in fair value used to calculate hedge ineffectiveness 764,000,000 661,000,000  
Variation in value recognized in Other comprehensive income 726,000,000 623,000,000  
Hedge ineffectiveness recognized in income 38,000,000 38,000,000  
Amount reclassified from foreign currency convertion into income 0 0  
Hedges of net investment in foreign operations [member] | Foreign exchange risk [member] | DDI futures [Member]      
Disclosure of Detailed Information about Hedges [Line Items]      
Nominal Value 27,990,000,000 23,641,000,000  
Book Value, Assets   49,000,000  
Book value, Liabilities 113,000,000    
Variations in fair value used to calculate hedge ineffectiveness (11,394,000,000) (7,646,000,000)  
Variation in value recognized in Other comprehensive income (11,353,000,000) (7,605,000,000)  
Hedge ineffectiveness recognized in income (41,000,000) (41,000,000)  
Amount reclassified from foreign currency convertion into income 0 0  
Hedges of net investment in foreign operations [member] | Foreign exchange risk [member] | Non deliverable forward contract [Member]      
Disclosure of Detailed Information about Hedges [Line Items]      
Nominal Value 13,167,000,000 11,474,000,000  
Book Value, Assets 255,000,000    
Book value, Liabilities   357,000,000  
Variations in fair value used to calculate hedge ineffectiveness 3,198,000,000 1,525,000,000  
Variation in value recognized in Other comprehensive income 3,189,000,000 1,516,000,000  
Hedge ineffectiveness recognized in income 9,000,000 9,000,000  
Amount reclassified from foreign currency convertion into income 0 0  
Hedges of net investment in foreign operations [member] | Foreign exchange risk [member] | Financial assets held for hedging[Member]      
Disclosure of Detailed Information about Hedges [Line Items]      
Nominal Value 803,000,000 541,000,000  
Book Value, Assets 803,000,000 541,000,000  
Variations in fair value used to calculate hedge ineffectiveness 136,000,000 (43,000,000)  
Variation in value recognized in Other comprehensive income 138,000,000 (41,000,000)  
Hedge ineffectiveness recognized in income (2,000,000) (2,000,000)  
Amount reclassified from foreign currency convertion into income R$ 0 R$ 0