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Derivatives - Schedule of Derivative Financial Instruments Portfolio by Type of Instrument (Detail) - BRL (R$) | Dec. 31, 2021 | Dec. 31, 2020
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Disclosure of detailed information about financial instruments [line items] |  |
B3 |  | R$ 17,778,000,000
Derivative financial instruments [member] | Financial institutions [member] | Over-the-counter market [member] |  |
Disclosure of detailed information about financial instruments [line items] |  |
B3 | R$ 4,861,000,000 | 5,140,000,000
Futures [Member] |  |
Disclosure of detailed information about financial instruments [line items] |  |
B3 | 857,781,000,000 | 781,453,000,000
Futures [Member] | Derivative financial instruments [member] |  |
Disclosure of detailed information about financial instruments [line items] |  |
B3 | 857,781,000,000 | 781,453,000,000
Futures [Member] | Derivative financial instruments [member] | B3 [member] |  |
Disclosure of detailed information about financial instruments [line items] |  |
B3 | 857,781,000,000 | 781,453,000,000
Swap [member] |  |
Disclosure of detailed information about financial instruments [line items] |  |
B3 | 1,338,457,000,000 | 1,442,449,000,000
Swap [member] | Derivative financial instruments [member] |  |
Disclosure of detailed information about financial instruments [line items] |  |
B3 | 1,338,457,000,000 | 1,442,449,000,000
Swap [member] | Derivative financial instruments [member] | B3 [member] |  |
Disclosure of detailed information about financial instruments [line items] |  |
B3 | 817,629,000,000 | 835,744,000,000
Swap [member] | Derivative financial instruments [member] | Over-the-counter market [member] |  |
Disclosure of detailed information about financial instruments [line items] |  |
B3 | 520,828,000,000 | 606,705,000,000
Swap [member] | Derivative financial instruments [member] | Financial institutions [member] | Over-the-counter market [member] |  |
Disclosure of detailed information about financial instruments [line items] |  |
B3 | 413,651,000,000 | 531,303,000,000
Swap [member] | Derivative financial instruments [member] | Companies [member] | Over-the-counter market [member] |  |
Disclosure of detailed information about financial instruments [line items] |  |
B3 | 103,758,000,000 | 69,337,000,000
Swap [member] | Derivative financial instruments [member] | Individuals [member] | Over-the-counter market [member] |  |
Disclosure of detailed information about financial instruments [line items] |  |
B3 | 3,419,000,000 | 6,065,000,000
Option contract [member] |  |
Disclosure of detailed information about financial instruments [line items] |  |
B3 | 1,621,736,000,000 | 1,738,849,000,000
Option contract [member] | Derivative financial instruments [member] |  |
Disclosure of detailed information about financial instruments [line items] |  |
B3 | 1,621,736,000,000 | 1,738,849,000,000
Option contract [member] | Derivative financial instruments [member] | B3 [member] |  |
Disclosure of detailed information about financial instruments [line items] |  |
B3 | 1,530,730,000,000 | 1,617,643,000,000
Option contract [member] | Derivative financial instruments [member] | Over-the-counter market [member] |  |
Disclosure of detailed information about financial instruments [line items] |  |
B3 | 91,006,000,000 | 121,206,000,000
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 | 57,540,000,000 | 84,865,000,000
Option contract [member] | Derivative financial instruments [member] | Companies [member] | Over-the-counter market [member] |  |
Disclosure of detailed information about financial instruments [line items] |  |
B3 | 32,415,000,000 | 35,021,000,000
Option contract [member] | Derivative financial instruments [member] | Individuals [member] | Over-the-counter market [member] |  |
Disclosure of detailed information about financial instruments [line items] |  |
B3 | 1,051,000,000 | 1,320,000,000
Forward [member] |  |
Disclosure of detailed information about financial instruments [line items] |  |
B3 | 26,129,000,000 | 23,989,000,000
Forward [member] | Derivative financial instruments [member] |  |
Disclosure of detailed information about financial instruments [line items] |  |
B3 | 26,129,000,000 | 23,989,000,000
Forward [member] | Derivative financial instruments [member] | B3 [member] |  |
Disclosure of detailed information about financial instruments [line items] |  |
B3 | 25,368,000,000 | 23,097,000,000
Forward [member] | Derivative financial instruments [member] | Over-the-counter market [member] |  |
Disclosure of detailed information about financial instruments [line items] |  |
B3 | 761,000,000 | 892,000,000
Forward [member] | Derivative financial instruments [member] | Financial institutions [member] | Over-the-counter market [member] |  |
Disclosure of detailed information about financial instruments [line items] |  |
B3 | 761,000,000 | 892,000,000
Credit derivatives [Member] |  |
Disclosure of detailed information about financial instruments [line items] |  |
B3 | 21,556,000,000 | 20,060,000,000
Credit derivatives [Member] | Derivative financial instruments [member] |  |
Disclosure of detailed information about financial instruments [line items] |  |
B3 | 21,556,000,000 | 20,060,000,000
Credit derivatives [Member] | Derivative financial instruments [member] | B3 [member] |  |
Disclosure of detailed information about financial instruments [line items] |  |
B3 | 7,535,000,000 | 3,743,000,000
Credit derivatives [Member] | Derivative financial instruments [member] | Over-the-counter market [member] |  |
Disclosure of detailed information about financial instruments [line items] |  |
B3 | 14,021,000,000 | 16,317,000,000
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 | 14,021,000,000 | 16,317,000,000
NDF [Member] |  |
Disclosure of detailed information about financial instruments [line items] |  |
B3 | 278,531,000,000 | 313,463,000,000
NDF [Member] | Derivative financial instruments [member] |  |
Disclosure of detailed information about financial instruments [line items] |  |
B3 | 278,531,000,000 | 313,463,000,000
NDF [Member] | Derivative financial instruments [member] | B3 [member] |  |
Disclosure of detailed information about financial instruments [line items] |  |
B3 | 65,035,000,000 | 67,887,000,000
NDF [Member] | Derivative financial instruments [member] | Over-the-counter market [member] |  |
Disclosure of detailed information about financial instruments [line items] |  |
B3 | 213,496,000,000 | 245,576,000,000
NDF [Member] | Derivative financial instruments [member] | Financial institutions [member] | Over-the-counter market [member] |  |
Disclosure of detailed information about financial instruments [line items] |  |
B3 | 76,415,000,000 | 124,124,000,000
NDF [Member] | Derivative financial instruments [member] | Companies [member] | Over-the-counter market [member] |  |
Disclosure of detailed information about financial instruments [line items] |  |
B3 | 136,270,000,000 | 120,476,000,000
NDF [Member] | Derivative financial instruments [member] | Individuals [member] | Over-the-counter market [member] |  |
Disclosure of detailed information about financial instruments [line items] |  |
B3 | 811,000,000 | 976,000,000
Target flow of swap [member] | Derivative financial instruments [member] |  |
Disclosure of detailed information about financial instruments [line items] |  |
B3 | 6,064,000,000 | 6,413,000,000
Target flow of swap [member] | Derivative financial instruments [member] | Over-the-counter market [member] |  |
Disclosure of detailed information about financial instruments [line items] |  |
B3 | 6,064,000,000 | 6,413,000,000
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 | 1,200,000,000 | 1,273,000,000
Other derivative financial instruments [Member] |  |
Disclosure of detailed information about financial instruments [line items] |  |
B3 | 6,064,000,000 | R$ 6,413,000,000
Other derivative financial instruments [Member] | Derivative financial instruments [member] | Individuals [member] | Over-the-counter market [member] |  |
Disclosure of detailed information about financial instruments [line items] |  |
B3 | R$ 3,000,000 |

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