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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, 2019 | Dec. 31, 2018 | Dec. 31, 2017
--- | --- | --- | ---
Disclosure Of Derivative Financial Instruments [Line Items] |  |  |
Assets | R$ 41,854 | R$ 23,466 |
Liabilities | (47,828) | (27,519) |
Swap contract [member] |  |  |
Disclosure Of Derivative Financial Instruments [Line Items] |  |  |
Assets | 26,458 | 13,093 |
Liabilities | (32,927) | (19,516) |
Options contract [member] |  |  |
Disclosure Of Derivative Financial Instruments [Line Items] |  |  |
Assets | 8,456 | 4,215 |
Liabilities | (9,061) | (3,929) |
Forward contract [member] |  |  |
Disclosure Of Derivative Financial Instruments [Line Items] |  |  |
Assets | 2,162 | 1,835 |
Liabilities | (754) | (470) |
Credit derivatives financial institutions [member] |  |  |
Disclosure Of Derivative Financial Instruments [Line Items] |  |  |
Assets | 167 | 120 |
Liabilities | (40) | (140) |
NDF - Non deliverable forward [member] |  |  |
Disclosure Of Derivative Financial Instruments [Line Items] |  |  |
Assets | 4,446 | 3,711 |
Liabilities | (4,971) | (3,384) |
Other derivative financial instruments [Member] |  |  |
Disclosure Of Derivative Financial Instruments [Line Items] |  |  |
Assets | 165 | 492 |
Liabilities | (75) | (80) |
Level 1 [Member] |  |  |
Disclosure Of Derivative Financial Instruments [Line Items] |  |  |
Assets | 14 | 15 |
Liabilities | (7) | (22) |
Level 1 [Member] | Swap contract [member] |  |  |
Disclosure Of Derivative Financial Instruments [Line Items] |  |  |
Assets | 0 |  |
Liabilities | 0 |  |
Level 1 [Member] | Options contract [member] |  |  |
Disclosure Of Derivative Financial Instruments [Line Items] |  |  |
Assets | 0 |  |
Liabilities | 0 |  |
Level 1 [Member] | Forward contract [member] |  |  |
Disclosure Of Derivative Financial Instruments [Line Items] |  |  |
Assets | 0 |  |
Liabilities | 0 |  |
Level 1 [Member] | Credit derivatives financial institutions [member] |  |  |
Disclosure Of Derivative Financial Instruments [Line Items] |  |  |
Assets | 0 |  |
Liabilities | 0 |  |
Level 1 [Member] | NDF - Non deliverable forward [member] |  |  |
Disclosure Of Derivative Financial Instruments [Line Items] |  |  |
Assets | 0 |  |
Liabilities | 0 |  |
Level 1 [Member] | Other derivative financial instruments [Member] |  |  |
Disclosure Of Derivative Financial Instruments [Line Items] |  |  |
Assets | 14 | 15 |
Liabilities | (7) | (22) |
Level 2 [Member] |  |  |
Disclosure Of Derivative Financial Instruments [Line Items] |  |  |
Assets | 41,737 | 23,309 |
Liabilities | (47,736) | (27,471) |
Level 2 [Member] | Swap contract [member] |  |  |
Disclosure Of Derivative Financial Instruments [Line Items] |  |  |
Assets | 26,426 | 13,003 |
Liabilities | (32,881) | (19,513) |
Level 2 [Member] | Options contract [member] |  |  |
Disclosure Of Derivative Financial Instruments [Line Items] |  |  |
Assets | 8,385 | 4,163 |
Liabilities | (9,022) | (3,906) |
Level 2 [Member] | Forward contract [member] |  |  |
Disclosure Of Derivative Financial Instruments [Line Items] |  |  |
Assets | 2,162 | 1,835 |
Liabilities | (754) | (470) |
Level 2 [Member] | Credit derivatives financial institutions [member] |  |  |
Disclosure Of Derivative Financial Instruments [Line Items] |  |  |
Assets | 167 | 120 |
Liabilities | (40) | (140) |
Level 2 [Member] | NDF - Non deliverable forward [member] |  |  |
Disclosure Of Derivative Financial Instruments [Line Items] |  |  |
Assets | 4,446 | 3,711 |
Liabilities | (4,971) | (3,384) |
Level 2 [Member] | Other derivative financial instruments [Member] |  |  |
Disclosure Of Derivative Financial Instruments [Line Items] |  |  |
Assets | 151 | 477 |
Liabilities | (68) | (58) |
Level 3 [Member] |  |  |
Disclosure Of Derivative Financial Instruments [Line Items] |  |  |
Assets | 103 | 142 | R$ 436
Liabilities | (85) | (26) | R$ (103)
Level 3 [Member] | Swap contract [member] |  |  |
Disclosure Of Derivative Financial Instruments [Line Items] |  |  |
Assets | 32 | 90 |
Liabilities | (46) | (3) |
Level 3 [Member] | Options contract [member] |  |  |
Disclosure Of Derivative Financial Instruments [Line Items] |  |  |
Assets | 71 | 52 |
Liabilities | (39) | (23) |
Level 3 [Member] | Forward contract [member] |  |  |
Disclosure Of Derivative Financial Instruments [Line Items] |  |  |
Assets | 0 |  |
Liabilities | 0 |  |
Level 3 [Member] | Credit derivatives financial institutions [member] |  |  |
Disclosure Of Derivative Financial Instruments [Line Items] |  |  |
Assets | 0 |  |
Liabilities | 0 |  |
Level 3 [Member] | NDF - Non deliverable forward [member] |  |  |
Disclosure Of Derivative Financial Instruments [Line Items] |  |  |
Assets | 0 |  |
Liabilities | 0 |  |
Level 3 [Member] | Other derivative financial instruments [Member] |  |  |
Disclosure Of Derivative Financial Instruments [Line Items] |  |  |
Assets | 0 | R$ 0 |
Liabilities | R$ 0 |  |

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