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Fair Value of Financial Instruments - Summary of Breakdown of Fair Value Hierarchy Levels for Derivative Assets and Liabilities (Detail) - BRL (R$) R$ in Millions | Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
--- | --- | --- | ---
Disclosure Of Derivative Financial Instruments [Line Items] |  |  |
Assets | R$ 69,045 | R$ 76,504 |
Liabilities | (63,204) | (79,505) |
Swap contract [member] |  |  |
Disclosure Of Derivative Financial Instruments [Line Items] |  |  |
Assets | 38,014 | 46,019 |
Liabilities | (34,646) | (51,789) |
Options contract [member] |  |  |
Disclosure Of Derivative Financial Instruments [Line Items] |  |  |
Assets | 21,252 | 20,418 |
Liabilities | (22,547) | (20,262) |
Forward contract [member] |  |  |
Disclosure Of Derivative Financial Instruments [Line Items] |  |  |
Assets | 3,111 | 2,085 |
Liabilities | (762) | (905) |
Credit derivatives financial institutions [member] |  |  |
Disclosure Of Derivative Financial Instruments [Line Items] |  |  |
Assets | 242 | 156 |
Liabilities | (198) | (76) |
NDF - Non deliverable forward [member] |  |  |
Disclosure Of Derivative Financial Instruments [Line Items] |  |  |
Assets | 5,943 | 7,596 |
Liabilities | (4,896) | (6,426) |
Other derivative financial instruments [Member] |  |  |
Disclosure Of Derivative Financial Instruments [Line Items] |  |  |
Assets | 483 | 230 |
Liabilities | (155) | (47) |
Level 1 [Member] |  |  |
Disclosure Of Derivative Financial Instruments [Line Items] |  |  |
Assets | 6 | 23 |
Liabilities | (3) | (22) |
Level 1 [Member] | Options contract [member] |  |  |
Disclosure Of Derivative Financial Instruments [Line Items] |  |  |
Assets | 3 | 4 |
Liabilities | (2) | (13) |
Level 1 [Member] | Other derivative financial instruments [Member] |  |  |
Disclosure Of Derivative Financial Instruments [Line Items] |  |  |
Assets | 3 | 19 |
Liabilities | (1) | (9) |
Level 2 [Member] |  |  |
Disclosure Of Derivative Financial Instruments [Line Items] |  |  |
Assets | 68,887 | 76,376 |
Liabilities | (63,076) | (79,373) |
Level 2 [Member] | Swap contract [member] |  |  |
Disclosure Of Derivative Financial Instruments [Line Items] |  |  |
Assets | 37,924 | 45,926 |
Liabilities | (34,535) | (51,680) |
Level 2 [Member] | Options contract [member] |  |  |
Disclosure Of Derivative Financial Instruments [Line Items] |  |  |
Assets | 21,187 | 20,402 |
Liabilities | (22,531) | (20,248) |
Level 2 [Member] | Forward contract [member] |  |  |
Disclosure Of Derivative Financial Instruments [Line Items] |  |  |
Assets | 3,111 | 2,085 |
Liabilities | (762) | (905) |
Level 2 [Member] | Credit derivatives financial institutions [member] |  |  |
Disclosure Of Derivative Financial Instruments [Line Items] |  |  |
Assets | 242 | 156 |
Liabilities | (198) | (76) |
Level 2 [Member] | NDF - Non deliverable forward [member] |  |  |
Disclosure Of Derivative Financial Instruments [Line Items] |  |  |
Assets | 5,943 | 7,596 |
Liabilities | (4,896) | (6,426) |
Level 2 [Member] | Other derivative financial instruments [Member] |  |  |
Disclosure Of Derivative Financial Instruments [Line Items] |  |  |
Assets | 480 | 211 |
Liabilities | (154) | (38) |
Level 3 [Member] |  |  |
Disclosure Of Derivative Financial Instruments [Line Items] |  |  |
Assets | 152 | 105 | R$ 103
Liabilities | (125) | (110) | R$ (85)
Level 3 [Member] | Swap contract [member] |  |  |
Disclosure Of Derivative Financial Instruments [Line Items] |  |  |
Assets | 90 | 93 |
Liabilities | (111) | (109) |
Level 3 [Member] | Options contract [member] |  |  |
Disclosure Of Derivative Financial Instruments [Line Items] |  |  |
Assets | 62 | 12 |
Liabilities | R$ (14) | R$ (1) |

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