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Derivatives - Schedule of Derivative Financial Instruments Portfolio by Type of Instrument (Detail) - BRL (R$) | Dec. 31, 2019 | Dec. 31, 2018
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Disclosure of detailed information about financial instruments [line items] |  |
B3 | R$ 20,000,000 |
Derivative financial instruments [member] | Financial institutions [member] | Over-the-counter market [member] |  |
Disclosure of detailed information about financial instruments [line items] |  |
B3 | 5,340,000,000 | R$ 3,602,000,000
Futures [Member] |  |
Disclosure of detailed information about financial instruments [line items] |  |
B3 | 664,884,000,000 | 586,033,000,000
Futures [Member] | Derivative financial instruments [member] |  |
Disclosure of detailed information about financial instruments [line items] |  |
B3 | 664,884,000,000 | 586,033,000,000
Futures [Member] | Derivative financial instruments [member] | B3 [member] |  |
Disclosure of detailed information about financial instruments [line items] |  |
B3 | 465,537,000,000 | 480,950,000,000
Futures [Member] | Derivative financial instruments [member] | Over-the-counter market [member] |  |
Disclosure of detailed information about financial instruments [line items] |  |
B3 | 199,347,000,000 | 105,083,000,000
Futures [Member] | Derivative financial instruments [member] | Financial institutions [member] | Over-the-counter market [member] |  |
Disclosure of detailed information about financial instruments [line items] |  |
B3 | 198,788,000,000 | 104,297,000,000
Futures [Member] | Derivative financial instruments [member] | Companies [member] | Over-the-counter market [member] |  |
Disclosure of detailed information about financial instruments [line items] |  |
B3 | 559,000,000 | 786,000,000
Swap [member] |  |
Disclosure of detailed information about financial instruments [line items] |  |
B3 | 1,094,378,000,000 | 940,844,000,000
Swap [member] | Derivative financial instruments [member] |  |
Disclosure of detailed information about financial instruments [line items] |  |
B3 | 1,094,378,000,000 | 940,844,000,000
Swap [member] | Derivative financial instruments [member] | B3 [member] |  |
Disclosure of detailed information about financial instruments [line items] |  |
B3 | 18,128,000,000 | 20,209,000,000
Swap [member] | Derivative financial instruments [member] | Over-the-counter market [member] |  |
Disclosure of detailed information about financial instruments [line items] |  |
B3 | 1,076,250,000,000 | 920,635,000,000
Swap [member] | Derivative financial instruments [member] | Financial institutions [member] | Over-the-counter market [member] |  |
Disclosure of detailed information about financial instruments [line items] |  |
B3 | 864,858,000,000 | 702,848,000,000
Swap [member] | Derivative financial instruments [member] | Companies [member] | Over-the-counter market [member] |  |
Disclosure of detailed information about financial instruments [line items] |  |
B3 | 180,005,000,000 | 151,973,000,000
Swap [member] | Derivative financial instruments [member] | Individuals [member] | Over-the-counter market [member] |  |
Disclosure of detailed information about financial instruments [line items] |  |
B3 | 31,387,000,000 | 65,814,000,000
Option contract [member] |  |
Disclosure of detailed information about financial instruments [line items] |  |
B3 | 1,720,205,000,000 | 1,262,568,000,000
Option contract [member] | Derivative financial instruments [member] |  |
Disclosure of detailed information about financial instruments [line items] |  |
B3 | 1,720,205,000,000 | 1,262,568,000,000
Option contract [member] | Derivative financial instruments [member] | B3 [member] |  |
Disclosure of detailed information about financial instruments [line items] |  |
B3 | 1,559,356,000,000 | 1,106,794,000,000
Option contract [member] | Derivative financial instruments [member] | Over-the-counter market [member] |  |
Disclosure of detailed information about financial instruments [line items] |  |
B3 | 160,849,000,000 | 155,774,000,000
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 | 125,312,000,000 | 110,859,000,000
Option contract [member] | Derivative financial instruments [member] | Companies [member] | Over-the-counter market [member] |  |
Disclosure of detailed information about financial instruments [line items] |  |
B3 | 35,122,000,000 | 44,464,000,000
Option contract [member] | Derivative financial instruments [member] | Individuals [member] | Over-the-counter market [member] |  |
Disclosure of detailed information about financial instruments [line items] |  |
B3 | 415,000,000 | 451,000,000
Forward [member] |  |
Disclosure of detailed information about financial instruments [line items] |  |
B3 | 5,134,000,000 | 2,341,000,000
Forward [member] | Derivative financial instruments [member] |  |
Disclosure of detailed information about financial instruments [line items] |  |
B3 | 5,134,000,000 | 2,341,000,000
Forward [member] | Derivative financial instruments [member] | B3 [member] |  |
Disclosure of detailed information about financial instruments [line items] |  |
B3 | 4,381,000,000 | 1,912,000,000
Forward [member] | Derivative financial instruments [member] | Over-the-counter market [member] |  |
Disclosure of detailed information about financial instruments [line items] |  |
B3 | 753,000,000 | 429,000,000
Forward [member] | Derivative financial instruments [member] | Financial institutions [member] | Over-the-counter market [member] |  |
Disclosure of detailed information about financial instruments [line items] |  |
B3 | 292,000,000 |
Forward [member] | Derivative financial instruments [member] | Companies [member] | Over-the-counter market [member] |  |
Disclosure of detailed information about financial instruments [line items] |  |
B3 | 461,000,000 | 429,000,000
Credit derivatives [Member] |  |
Disclosure of detailed information about financial instruments [line items] |  |
B3 | 12,739,000,000 | 8,324,000,000
Credit derivatives [Member] | Derivative financial instruments [member] |  |
Disclosure of detailed information about financial instruments [line items] |  |
B3 | 12,739,000,000 | 8,324,000,000
Credit derivatives [Member] | Derivative financial instruments [member] | B3 [member] |  |
Disclosure of detailed information about financial instruments [line items] |  |
B3 | 1,000,000 |
Credit derivatives [Member] | Derivative financial instruments [member] | Over-the-counter market [member] |  |
Disclosure of detailed information about financial instruments [line items] |  |
B3 | 12,738,000,000 | 8,324,000,000
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 | 12,738,000,000 | 7,742,000,000
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 | 295,508,000,000 | 225,355,000,000
NDF [Member] | Derivative financial instruments [member] |  |
Disclosure of detailed information about financial instruments [line items] |  |
B3 | 295,508,000,000 | 225,355,000,000
NDF [Member] | Derivative financial instruments [member] | B3 [member] |  |
Disclosure of detailed information about financial instruments [line items] |  |
B3 | 53,756,000,000 | 47,628,000,000
NDF [Member] | Derivative financial instruments [member] | Over-the-counter market [member] |  |
Disclosure of detailed information about financial instruments [line items] |  |
B3 | 241,752,000,000 | 177,727,000,000
NDF [Member] | Derivative financial instruments [member] | Financial institutions [member] | Over-the-counter market [member] |  |
Disclosure of detailed information about financial instruments [line items] |  |
B3 | 141,204,000,000 | 103,172,000,000
NDF [Member] | Derivative financial instruments [member] | Companies [member] | Over-the-counter market [member] |  |
Disclosure of detailed information about financial instruments [line items] |  |
B3 | 99,204,000,000 | 73,811,000,000
NDF [Member] | Derivative financial instruments [member] | Individuals [member] | Over-the-counter market [member] |  |
Disclosure of detailed information about financial instruments [line items] |  |
B3 | 1,344,000,000 | 744,000,000
Target flow of swap [member] | Derivative financial instruments [member] |  |
Disclosure of detailed information about financial instruments [line items] |  |
B3 | 6,581,000,000 | 5,304,000,000
Target flow of swap [member] | Derivative financial instruments [member] | Over-the-counter market [member] |  |
Disclosure of detailed information about financial instruments [line items] |  |
B3 | 6,581,000,000 | 5,304,000,000
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 | R$ 1,241,000,000 | R$ 1,702,000,000

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