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Hedge Accounting - Schedule of the Effect of Hedge Accounting on the Financial Position and Performance (Detail) - BRL (R$)
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Disclosure of Detailed Information about Hedges [Line Items]    
Nominal Value R$ 126,549,000,000 R$ 171,439,000,000
Fair value hedge [Member]    
Disclosure of Detailed Information about Hedges [Line Items]    
Book value of the hedged item, Assets 12,457,000,000 6,459,000,000
Book Value of the hedged item, Liabilities 9,124,000,000 12,951,000,000
Fair value of the hedge item, Assets 12,602,000,000 6,428,000,000
Fair value of the hedge item, Liabilities 9,081,000,000 10,341,000,000
Variation in the amounts used to calculate hedge ineffectiveness 103,000,000 25,000,000
Nominal Value 21,591,000,000 19,410,000,000
Variation in value recognized in income (93,000,000) (27,000,000)
Fair value hedge [Member] | Hedge of loan operations [Member]    
Disclosure of Detailed Information about Hedges [Line Items]    
Book value of the hedged item, Assets 7,066,000,000 5,977,000,000
Fair value of the hedge item, Assets 7,119,000,000 5,978,000,000
Variation in the amounts used to calculate hedge ineffectiveness 53,000,000 (50,000,000)
Nominal Value 7,066,000,000 5,977,000,000
Variation in value recognized in income (54,000,000) 52,000,000
Fair value hedge [Member] | Hedge of funding [Member]    
Disclosure of Detailed Information about Hedges [Line Items]    
Book value of the hedged item, Assets 0  
Book Value of the hedged item, Liabilities 9,124,000,000 12,157,000,000
Fair value of the hedge item, Liabilities 9,081,000,000 9,562,000,000
Variation in the amounts used to calculate hedge ineffectiveness (43,000,000) 108,000,000
Nominal Value 9,124,000,000 12,157,000,000
Variation in value recognized in income 43,000,000 (113,000,000)
Fair value hedge [Member] | Hedge of fair value through other comprehensive income [Member]    
Disclosure of Detailed Information about Hedges [Line Items]    
Book value of the hedged item, Assets 5,391,000,000 482,000,000
Fair value of the hedge item, Assets 5,483,000,000 450,000,000
Variation in the amounts used to calculate hedge ineffectiveness 93,000,000 (33,000,000)
Nominal Value 5,401,000,000 482,000,000
Variation in value recognized in income R$ (82,000,000) 34,000,000
Fair value hedge [Member] | Hedge of syndicated loan [Member]    
Disclosure of Detailed Information about Hedges [Line Items]    
Book Value of the hedged item, Liabilities   794,000,000
Fair value of the hedge item, Liabilities   779,000,000
Nominal Value   R$ 794,000,000