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Hedge Accounting - Schedule of the Effect of Hedge Accounting on the Financial Position and Performance (Detail) - BRL (R$)
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Disclosure of Detailed Information about Hedges [Line Items]    
Nominal Value R$ 116,430,000,000 R$ 126,549,000,000
Fair value hedge [Member]    
Disclosure of Detailed Information about Hedges [Line Items]    
Book value of the hedged item, Assets 11,868,000,000 12,457,000,000
Book Value of the hedged item, Liabilities 7,436,000,000 9,124,000,000
Fair value of the hedge item, Assets 12,216,000,000 12,602,000,000
Fair value of the hedge item, Liabilities 8,195,000,000 9,167,000,000
Variation in the amounts used to calculate hedge ineffectiveness (411,000,000) 103,000,000
Nominal Value 19,431,000,000 21,591,000,000
Variation in value recognized in income 426,000,000 (93,000,000)
Fair value hedge [Member] | Hedge of loan operations [Member]    
Disclosure of Detailed Information about Hedges [Line Items]    
Book value of the hedged item, Assets 7,386,000,000 7,066,000,000
Fair value of the hedge item, Assets 7,642,000,000 7,119,000,000
Variation in the amounts used to calculate hedge ineffectiveness 256,000,000 53,000,000
Nominal Value 7,386,000,000 7,066,000,000
Variation in value recognized in income (264,000,000) (54,000,000)
Fair value hedge [Member] | Hedge of funding [Member]    
Disclosure of Detailed Information about Hedges [Line Items]    
Book Value of the hedged item, Liabilities 7,436,000,000 9,124,000,000
Fair value of the hedge item, Liabilities 8,195,000,000 9,167,000,000
Variation in the amounts used to calculate hedge ineffectiveness (759,000,000) (43,000,000)
Nominal Value 7,436,000,000 9,124,000,000
Variation in value recognized in income 775,000,000 43,000,000
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 4,482,000,000 5,391,000,000
Fair value of the hedge item, Assets 4,574,000,000 5,483,000,000
Variation in the amounts used to calculate hedge ineffectiveness 92,000,000 93,000,000
Nominal Value 4,609,000,000 5,401,000,000
Variation in value recognized in income R$ (85,000,000) R$ (82,000,000)