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Hedge Accounting - Summary of Hedge Cash flow (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  
Hedge of deposits and repurchase agreements [Member]      
Disclosure of Detailed Information about Hedges [Line Items]      
Nominal Value 29,727,000,000 62,667,000,000  
Hedge of assets transactions [Member]      
Disclosure of Detailed Information about Hedges [Line Items]      
Nominal Value 8,003,000,000 23,919,000,000  
Hedge of asset backed securities under repurchase agreements [Member]      
Disclosure of Detailed Information about Hedges [Line Items]      
Nominal Value 38,013,000,000 31,855,000,000  
Hedge of assets denominated in UF [Member]      
Disclosure of Detailed Information about Hedges [Line Items]      
Nominal Value 13,221,000,000 15,227,000,000  
Hedge of highly probable forecast transactions [Member]      
Disclosure of Detailed Information about Hedges [Line Items]      
Nominal Value 71,000,000 232,000,000  
Cash flow hedges [member]      
Disclosure of Detailed Information about Hedges [Line Items]      
Book value of the hedged item, Assets 58,126,000,000 71,159,000,000  
Book value of the hedged item, Liabilities 32,927,000,000 69,111,000,000  
Variation in value recognized in Other comprehensive income (1,077,000,000) (2,162,000,000)  
Cash flow hedge reserve (2,333,000,000) (2,162,000,000)  
Nominal Value 92,408,000,000 141,468,000,000  
Variation in the amounts used to calculate hedge ineffectiveness (1,187,000,000) (2,321,000,000)  
Cash flow hedges [member] | Hedge of loan operations [Member]      
Disclosure of Detailed Information about Hedges [Line Items]      
Nominal Value 268,000,000 1,124,000,000  
Cash flow hedges [member] | Hedge of funding [Member]      
Disclosure of Detailed Information about Hedges [Line Items]      
Nominal Value 3,105,000,000 6,444,000,000  
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 29,727,000,000 62,667,000,000  
Variation in value recognized in Other comprehensive income (1,682,000,000) (3,227,000,000)  
Cash flow hedge reserve (2,946,000,000) (3,227,000,000)  
Nominal Value 29,727,000,000 62,667,000,000  
Variation in the amounts used to calculate hedge ineffectiveness (1,800,000,000) (3,377,000,000)  
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 7,866,000,000 23,490,000,000  
Variation in value recognized in Other comprehensive income 136,000,000 429,000,000  
Cash flow hedge reserve 136,000,000 429,000,000  
Nominal Value 8,003,000,000 23,919,000,000  
Variation in the amounts used to calculate hedge ineffectiveness 136,000,000 429,000,000  
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 36,668,000,000 31,099,000,000  
Variation in value recognized in Other comprehensive income 353,000,000 672,000,000  
Cash flow hedge reserve 353,000,000 672,000,000  
Nominal Value 38,013,000,000 31,855,000,000  
Variation in the amounts used to calculate hedge ineffectiveness 359,000,000 670,000,000  
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 274,000,000 1,124,000,000  
Variation in value recognized in Other comprehensive income 6,000,000 14,000,000  
Cash flow hedge reserve 6,000,000 14,000,000  
Nominal Value 268,000,000 1,124,000,000  
Variation in the amounts used to calculate hedge ineffectiveness 7,000,000 13,000,000  
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 13,247,000,000 15,227,000,000  
Variation in value recognized in Other comprehensive income 26,000,000 (29,000,000)  
Cash flow hedge reserve 26,000,000 (29,000,000)  
Nominal Value 13,221,000,000 15,227,000,000  
Variation in the amounts used to calculate hedge ineffectiveness 23,000,000 (34,000,000)  
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 3,200,000,000 6,444,000,000  
Variation in value recognized in Other comprehensive income 78,000,000 (16,000,000)  
Cash flow hedge reserve 86,000,000 (16,000,000)  
Nominal Value 3,105,000,000 6,444,000,000  
Variation in the amounts used to calculate hedge ineffectiveness 82,000,000 (17,000,000)  
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 14,820,000,000 13,074,000,000  
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  
Variation in the amounts used to calculate hedge ineffectiveness (7,296,000,000) (5,503,000,000)  
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 71,000,000 219,000,000  
Variation in value recognized in Other comprehensive income 6,000,000 (5,000,000)  
Cash flow hedge reserve 6,000,000 (5,000,000)  
Nominal Value 71,000,000 232,000,000  
Variation in the amounts used to calculate hedge ineffectiveness R$ 6,000,000 R$ (5,000,000)