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Hedge Accounting - Summary of Hedge Cash flow (Detail) - BRL (R$)
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Disclosure of Detailed Information about Hedges [Line Items]      
Variation in value recognized in Other comprehensive income R$ (16,000,000) R$ (1,135,000,000) R$ (571,000,000)
Nominal Value 116,430,000,000 126,549,000,000  
Hedge of deposits and repurchase agreements [Member]      
Disclosure of Detailed Information about Hedges [Line Items]      
Nominal Value 24,543,000,000 29,727,000,000  
Hedge of assets transactions [Member]      
Disclosure of Detailed Information about Hedges [Line Items]      
Nominal Value 5,656,000,000 8,003,000,000  
Hedge of asset backed securities under repurchase agreements [Member]      
Disclosure of Detailed Information about Hedges [Line Items]      
Nominal Value 32,130,000,000 38,013,000,000  
Hedge of assets denominated in UF [Member]      
Disclosure of Detailed Information about Hedges [Line Items]      
Nominal Value 12,582,000,000 13,221,000,000  
Hedge of highly probable forecast transactions [Member]      
Disclosure of Detailed Information about Hedges [Line Items]      
Nominal Value 294,000,000 71,000,000  
Cash flow hedges [member]      
Disclosure of Detailed Information about Hedges [Line Items]      
Book value of the hedged item, Assets 49,611,000,000 58,126,000,000  
Book value of the hedged item, Liabilities 29,160,000,000 32,927,000,000  
Variation in value recognized in Other comprehensive income (2,217,000,000) (1,077,000,000)  
Cash flow hedge reserve (2,524,000,000) (2,333,000,000)  
Nominal Value 80,052,000,000 92,408,000,000  
Variation in the amounts used to calculate hedge ineffectiveness (2,219,000,000) (1,187,000,000)  
Cash flow hedges [member] | Hedge of loan operations [Member]      
Disclosure of Detailed Information about Hedges [Line Items]      
Nominal Value 257,000,000 268,000,000  
Cash flow hedges [member] | Hedge of funding [Member]      
Disclosure of Detailed Information about Hedges [Line Items]      
Nominal Value 4,590,000,000 3,105,000,000  
Interest rate risk [Member] | Cash flow hedges [member] | Hedge of deposits and repurchase agreements [Member]      
Disclosure of Detailed Information about Hedges [Line Items]      
Book value of the hedged item, Liabilities 24,543,000,000 29,727,000,000  
Variation in value recognized in Other comprehensive income (2,808,000,000) (1,682,000,000)  
Cash flow hedge reserve (3,310,000,000) (2,946,000,000)  
Nominal Value 24,543,000,000 29,727,000,000  
Variation in the amounts used to calculate hedge ineffectiveness (2,814,000,000) (1,800,000,000)  
Interest rate risk [Member] | Cash flow hedges [member] | Hedge of assets transactions [Member]      
Disclosure of Detailed Information about Hedges [Line Items]      
Book value of the hedged item, Assets 5,564,000,000 7,866,000,000  
Variation in value recognized in Other comprehensive income 91,000,000 136,000,000  
Cash flow hedge reserve 91,000,000 136,000,000  
Nominal Value 5,656,000,000 8,003,000,000  
Variation in the amounts used to calculate hedge ineffectiveness 91,000,000 136,000,000  
Interest rate risk [Member] | Cash flow hedges [member] | Hedge of asset backed securities under repurchase agreements [Member]      
Disclosure of Detailed Information about Hedges [Line Items]      
Book value of the hedged item, Assets 30,896,000,000 36,668,000,000  
Variation in value recognized in Other comprehensive income 520,000,000 353,000,000  
Cash flow hedge reserve 520,000,000 353,000,000  
Nominal Value 32,130,000,000 38,013,000,000  
Variation in the amounts used to calculate hedge ineffectiveness 523,000,000 359,000,000  
Interest rate risk [Member] | Cash flow hedges [member] | Hedge of loan operations [Member]      
Disclosure of Detailed Information about Hedges [Line Items]      
Book value of the hedged item, Assets 269,000,000 274,000,000  
Variation in value recognized in Other comprehensive income 12,000,000 6,000,000  
Cash flow hedge reserve 12,000,000 6,000,000  
Nominal Value 257,000,000 268,000,000  
Variation in the amounts used to calculate hedge ineffectiveness 14,000,000 7,000,000  
Interest rate risk [Member] | Cash flow hedges [member] | Hedge of assets denominated in UF [Member]      
Disclosure of Detailed Information about Hedges [Line Items]      
Book value of the hedged item, Assets 12,588,000,000 13,247,000,000  
Variation in value recognized in Other comprehensive income 6,000,000 26,000,000  
Cash flow hedge reserve 6,000,000 26,000,000  
Nominal Value 12,582,000,000 13,221,000,000  
Variation in the amounts used to calculate hedge ineffectiveness 5,000,000 23,000,000  
Interest rate risk [Member] | Cash flow hedges [member] | Hedge of funding [Member]      
Disclosure of Detailed Information about Hedges [Line Items]      
Book value of the hedged item, Liabilities 4,617,000,000 3,200,000,000  
Variation in value recognized in Other comprehensive income (27,000,000) 78,000,000  
Cash flow hedge reserve (22,000,000) 86,000,000  
Nominal Value 4,590,000,000 3,105,000,000  
Variation in the amounts used to calculate hedge ineffectiveness (27,000,000) 82,000,000  
Foreign exchange risk [member]      
Disclosure of Detailed Information about Hedges [Line Items]      
Book value of the hedged item, Assets 0 0  
Book value of the hedged item, Liabilities 14,396,000,000 14,820,000,000  
Variation in value recognized in Other comprehensive income (7,217,000,000) (7,300,000,000)  
Nominal Value 16,947,000,000 12,550,000,000  
Variation in the amounts used to calculate hedge ineffectiveness (7,220,000,000) (7,296,000,000)  
Foreign exchange risk [member] | Cash flow hedges [member] | Hedge of highly probable forecast transactions [Member]      
Disclosure of Detailed Information about Hedges [Line Items]      
Book value of the hedged item, Assets 294,000,000 71,000,000  
Variation in value recognized in Other comprehensive income (11,000,000) 6,000,000  
Cash flow hedge reserve 179,000,000 6,000,000  
Nominal Value 294,000,000 71,000,000  
Variation in the amounts used to calculate hedge ineffectiveness R$ (11,000,000) R$ 6,000,000