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Hedge Accounting - Summary of Cash Flow Hedge Instruments (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)  
Cash flow hedges [member]      
Disclosure of Detailed Information about Hedges [Line Items]      
Nominal Value 80,052,000,000 92,408,000,000  
Book Value, Assets 4,617,000,000 3,293,000,000  
Book value, Liabilities 13,028,000,000 13,540,000,000  
Variations in fair value used to calculate hedge ineffectiveness (2,219,000,000) (1,187,000,000)  
Variation in value recognized in Other comprehensive income (2,217,000,000) (1,077,000,000)  
Hedge ineffectiveness recognized in income (2,000,000) (110,000,000)  
Amount reclassified from Cash flow hedge reserve to income 0 0  
Cash flow hedges [member] | Interest rate risk [Member] | Interest rate futures [member]      
Disclosure of Detailed Information about Hedges [Line Items]      
Nominal Value 62,329,000,000 75,743,000,000  
Book Value, Assets   256,000,000  
Book value, Liabilities 14,000,000 21,000,000  
Variations in fair value used to calculate hedge ineffectiveness (2,200,000,000) (1,305,000,000)  
Variation in value recognized in Other comprehensive income (2,197,000,000) (1,193,000,000)  
Hedge ineffectiveness recognized in income (3,000,000) (112,000,000)  
Amount reclassified from Cash flow hedge reserve to income 0 0  
Cash flow hedges [member] | Interest rate risk [Member] | Interest rate swap2 [Member]      
Disclosure of Detailed Information about Hedges [Line Items]      
Nominal Value 17,429,000,000 16,594,000,000  
Book Value, Assets 4,617,000,000 3,023,000,000  
Book value, Liabilities 12,858,000,000 13,519,000,000  
Variations in fair value used to calculate hedge ineffectiveness (8,000,000) 112,000,000  
Variation in value recognized in Other comprehensive income (9,000,000) 110,000,000  
Hedge ineffectiveness recognized in income 1,000,000 2,000,000  
Amount reclassified from Cash flow hedge reserve to income 0 0  
Cash flow hedges [member] | Foreign exchange risk [member] | Futures [Member]      
Disclosure of Detailed Information about Hedges [Line Items]      
Nominal Value 294,000,000 6,000,000  
Book Value, Assets   5,000,000  
Book value, Liabilities 156,000,000    
Variations in fair value used to calculate hedge ineffectiveness (11,000,000) 1,000,000  
Variation in value recognized in Other comprehensive income (11,000,000) 1,000,000  
Amount reclassified from Cash flow hedge reserve to income R$ 0 0  
Cash flow hedges [member] | Foreign exchange risk [member] | Option contract [member]      
Disclosure of Detailed Information about Hedges [Line Items]      
Nominal Value   65,000,000  
Book Value, Assets   9,000,000  
Variations in fair value used to calculate hedge ineffectiveness   5,000,000  
Variation in value recognized in Other comprehensive income   5,000,000  
Amount reclassified from Cash flow hedge reserve to income   R$ 0