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Derivatives - Schedule of Derivative Financial Instruments Portfolio by Type of Instrument (Detail) - BRL (R$) | Dec. 31, 2018 | Dec. 31, 2017
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Futures [Member] |  |
Disclosure of detailed information about financial instruments [line items] |  |
B3 | R$ 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

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