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Derivatives - Schedule of Derivative Financial Instruments Portfolio by Type of Instrument (Detail) - BRL (R$)
Dec. 31, 2018
Dec. 31, 2017
Futures [Member]    
Disclosure of detailed information about financial instruments [line items]    
B3 R$ 586,033,000,000 R$ 607,980,000,000
Futures [Member] | Derivative financial instruments [member]    
Disclosure of detailed information about financial instruments [line items]    
B3 586,033,000,000 607,980,000,000
Futures [Member] | Derivative financial instruments [member] | B3 [member]    
Disclosure of detailed information about financial instruments [line items]    
B3 480,950,000,000 476,031,000,000
Futures [Member] | Derivative financial instruments [member] | Over-the-counter market [member]    
Disclosure of detailed information about financial instruments [line items]    
B3 105,083,000,000 131,949,000,000
Futures [Member] | Derivative financial instruments [member] | Financial institutions [member] | Over-the-counter market [member]    
Disclosure of detailed information about financial instruments [line items]    
B3 104,297,000,000 131,525,000,000
Futures [Member] | Derivative financial instruments [member] | Companies [member] | Over-the-counter market [member]    
Disclosure of detailed information about financial instruments [line items]    
B3 786,000,000 424,000,000
Swap [member]    
Disclosure of detailed information about financial instruments [line items]    
B3 939,510,000,000 837,299,000,000
Swap [member] | Derivative financial instruments [member]    
Disclosure of detailed information about financial instruments [line items]    
B3 939,510,000,000 837,299,000,000
Swap [member] | Derivative financial instruments [member] | B3 [member]    
Disclosure of detailed information about financial instruments [line items]    
B3 20,209,000,000 24,339,000,000
Swap [member] | Derivative financial instruments [member] | Over-the-counter market [member]    
Disclosure of detailed information about financial instruments [line items]    
B3 919,301,000,000 812,960,000,000
Swap [member] | Derivative financial instruments [member] | Financial institutions [member] | Over-the-counter market [member]    
Disclosure of detailed information about financial instruments [line items]    
B3 702,848,000,000 525,855,000,000
Swap [member] | Derivative financial instruments [member] | Companies [member] | Over-the-counter market [member]    
Disclosure of detailed information about financial instruments [line items]    
B3 150,639,000,000 173,129,000,000
Swap [member] | Derivative financial instruments [member] | Individuals [member] | Over-the-counter market [member]    
Disclosure of detailed information about financial instruments [line items]    
B3 65,814,000,000 113,976,000,000
Option contract [member]    
Disclosure of detailed information about financial instruments [line items]    
B3 1,262,568,000,000 1,847,829,000,000
Option contract [member] | Derivative financial instruments [member]    
Disclosure of detailed information about financial instruments [line items]    
B3 1,262,568,000,000 1,847,829,000,000
Option contract [member] | Derivative financial instruments [member] | B3 [member]    
Disclosure of detailed information about financial instruments [line items]    
B3 1,106,794,000,000 1,746,729,000,000
Option contract [member] | Derivative financial instruments [member] | Over-the-counter market [member]    
Disclosure of detailed information about financial instruments [line items]    
B3 155,774,000,000 101,100,000,000
Option contract [member] | Derivative financial instruments [member] | Financial institutions [member] | Over-the-counter market [member]    
Disclosure of detailed information about financial instruments [line items]    
B3 110,859,000,000 69,460,000,000
Option contract [member] | Derivative financial instruments [member] | Companies [member] | Over-the-counter market [member]    
Disclosure of detailed information about financial instruments [line items]    
B3 44,464,000,000 31,340,000,000
Option contract [member] | Derivative financial instruments [member] | Individuals [member] | Over-the-counter market [member]    
Disclosure of detailed information about financial instruments [line items]    
B3 451,000,000 300,000,000
Forward [member]    
Disclosure of detailed information about financial instruments [line items]    
B3 2,341,000,000 9,954,000,000
Forward [member] | Derivative financial instruments [member]    
Disclosure of detailed information about financial instruments [line items]    
B3 2,341,000,000 9,954,000,000
Forward [member] | Derivative financial instruments [member] | B3 [member]    
Disclosure of detailed information about financial instruments [line items]    
B3 1,912,000,000 4,023,000,000
Forward [member] | Derivative financial instruments [member] | Over-the-counter market [member]    
Disclosure of detailed information about financial instruments [line items]    
B3 429,000,000 5,931,000,000
Forward [member] | Derivative financial instruments [member] | Companies [member] | Over-the-counter market [member]    
Disclosure of detailed information about financial instruments [line items]    
B3 429,000,000 5,931,000,000
Credit derivatives [Member]    
Disclosure of detailed information about financial instruments [line items]    
B3 8,324,000,000 10,110,000,000
Credit derivatives [Member] | Derivative financial instruments [member]    
Disclosure of detailed information about financial instruments [line items]    
B3 8,324,000,000 10,110,000,000
Credit derivatives [Member] | Derivative financial instruments [member] | Over-the-counter market [member]    
Disclosure of detailed information about financial instruments [line items]    
B3 8,324,000,000 10,110,000,000
Credit derivatives [Member] | Derivative financial instruments [member] | Financial institutions [member] | Over-the-counter market [member]    
Disclosure of detailed information about financial instruments [line items]    
B3 7,742,000,000 10,110,000,000
Credit derivatives [Member] | Derivative financial instruments [member] | Companies [member] | Over-the-counter market [member]    
Disclosure of detailed information about financial instruments [line items]    
B3 582,000,000  
NDF [Member]    
Disclosure of detailed information about financial instruments [line items]    
B3 225,355,000,000 252,628,000,000
NDF [Member] | Derivative financial instruments [member]    
Disclosure of detailed information about financial instruments [line items]    
B3 225,355,000,000 252,628,000,000
NDF [Member] | Derivative financial instruments [member] | B3 [member]    
Disclosure of detailed information about financial instruments [line items]    
B3 47,628,000,000 76,838,000,000
NDF [Member] | Derivative financial instruments [member] | Over-the-counter market [member]    
Disclosure of detailed information about financial instruments [line items]    
B3 177,727,000,000 175,790,000,000
NDF [Member] | Derivative financial instruments [member] | Financial institutions [member] | Over-the-counter market [member]    
Disclosure of detailed information about financial instruments [line items]    
B3 103,172,000,000 118,743,000,000
NDF [Member] | Derivative financial instruments [member] | Companies [member] | Over-the-counter market [member]    
Disclosure of detailed information about financial instruments [line items]    
B3 73,811,000,000 56,905,000,000
NDF [Member] | Derivative financial instruments [member] | Individuals [member] | Over-the-counter market [member]    
Disclosure of detailed information about financial instruments [line items]    
B3 744,000,000 142,000,000
Target flow of swap [member] | Derivative financial instruments [member]    
Disclosure of detailed information about financial instruments [line items]    
B3 1,334,000,000 955,000,000
Target flow of swap [member] | Derivative financial instruments [member] | Over-the-counter market [member]    
Disclosure of detailed information about financial instruments [line items]    
B3 1,334,000,000 955,000,000
Target flow of swap [member] | Derivative financial instruments [member] | Companies [member] | Over-the-counter market [member]    
Disclosure of detailed information about financial instruments [line items]    
B3 1,334,000,000 955,000,000
Other derivative financial instruments [Member]    
Disclosure of detailed information about financial instruments [line items]    
B3 5,304,000,000 4,225,000,000
Other derivative financial instruments [Member] | Derivative financial instruments [member]    
Disclosure of detailed information about financial instruments [line items]    
B3 5,304,000,000 4,225,000,000
Other derivative financial instruments [Member] | Derivative financial instruments [member] | Over-the-counter market [member]    
Disclosure of detailed information about financial instruments [line items]    
B3 5,304,000,000 4,225,000,000
Other derivative financial instruments [Member] | Derivative financial instruments [member] | Financial institutions [member] | Over-the-counter market [member]    
Disclosure of detailed information about financial instruments [line items]    
B3 3,602,000,000 1,792,000,000
Other derivative financial instruments [Member] | Derivative financial instruments [member] | Companies [member] | Over-the-counter market [member]    
Disclosure of detailed information about financial instruments [line items]    
B3 R$ 1,702,000,000 R$ 2,433,000,000