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Hedge Accounting - Summary of Hedge Instrument of Net Investment in Foreign (Detail) - BRL (R$)
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Disclosure of Detailed Information about Hedges [Line Items]      
Nominal Value R$ 116,430,000,000 R$ 126,549,000,000  
Variation in value recognized in Other comprehensive income (16,000,000) (1,135,000,000) R$ (571,000,000)
Foreign exchange risk [member]      
Disclosure of Detailed Information about Hedges [Line Items]      
Nominal Value 16,947,000,000 12,550,000,000  
Variation in value recognized in Other comprehensive income (7,217,000,000) (7,300,000,000)  
Hedges of net investment in foreign operations [member]      
Disclosure of Detailed Information about Hedges [Line Items]      
Nominal Value 16,947,000,000 12,550,000,000  
Book Value, Assets 4,988,000,000 2,117,000,000  
Book value, Liabilities 0 113,000,000  
Variations in fair value used to calculate hedge ineffectiveness (7,220,000,000) (7,296,000,000)  
Variation in value recognized in Other comprehensive income (7,217,000,000) (7,300,000,000)  
Hedge ineffectiveness recognized in income (3,000,000) 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 16,947,000,000 12,550,000,000  
Variation in value recognized in Other comprehensive income (7,217,000,000) (7,300,000,000)  
Hedges of net investment in foreign operations [member] | Foreign exchange risk [member] | Forward [member]      
Disclosure of Detailed Information about Hedges [Line Items]      
Nominal Value (2,990,000,000) (1,470,000,000)  
Book Value, Assets 2,977,000,000 1,059,000,000  
Book value, Liabilities 0    
Variations in fair value used to calculate hedge ineffectiveness 408,000,000 764,000,000  
Variation in value recognized in Other comprehensive income 381,000,000 726,000,000  
Hedge ineffectiveness recognized in income 27,000,000 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 32,966,000,000 27,990,000,000  
Book Value, Assets 228,000,000    
Book value, Liabilities 0 113,000,000  
Variations in fair value used to calculate hedge ineffectiveness (12,329,000,000) (11,394,000,000)  
Variation in value recognized in Other comprehensive income (12,292,000,000) (11,353,000,000)  
Hedge ineffectiveness recognized in income (37,000,000) (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 (11,525,000,000) (13,167,000,000)  
Book Value, Assets 260,000,000 255,000,000  
Book value, Liabilities 0    
Variations in fair value used to calculate hedge ineffectiveness 4,443,000,000 3,198,000,000  
Variation in value recognized in Other comprehensive income 4,434,000,000 3,189,000,000  
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 (1,504,000,000) (803,000,000)  
Book Value, Assets 1,523,000,000 803,000,000  
Book value, Liabilities 0    
Variations in fair value used to calculate hedge ineffectiveness 258,000,000 136,000,000  
Variation in value recognized in Other comprehensive income 260,000,000 138,000,000  
Hedge ineffectiveness recognized in income (2,000,000) (2,000,000)  
Amount reclassified from foreign currency convertion into income R$ 0 R$ 0