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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, 2018 | Dec. 31, 2017 | Jan. 01, 2017 | Dec. 31, 2016
--- | --- | --- | --- | ---
Disclosure Of Derivative Financial Instruments [Line Items] |  |  |  |
Assets | R$ 23,466 | R$ 22,843 | R$ 24,231 |
Liabilities | (27,519) | (26,746) | R$ (24,698) |
Futures [Member] |  |  |  |
Disclosure Of Derivative Financial Instruments [Line Items] |  |  |  |
Assets |  | 158 |  |
Swap [member] |  |  |  |
Disclosure Of Derivative Financial Instruments [Line Items] |  |  |  |
Assets | 13,049 | 9,190 |  |
Liabilities | (19,354) | (13,692) |  |
Options [Member] |  |  |  |
Disclosure Of Derivative Financial Instruments [Line Items] |  |  |  |
Assets | 4,215 | 3,337 |  |
Liabilities | (3,929) | (2,793) |  |
Forward [member] |  |  |  |
Disclosure Of Derivative Financial Instruments [Line Items] |  |  |  |
Assets | 1,835 | 6,911 |  |
Liabilities | (470) | (6,272) |  |
Credit derivatives financial institutions [member] |  |  |  |
Disclosure Of Derivative Financial Instruments [Line Items] |  |  |  |
Assets | 120 | 137 |  |
Liabilities | (140) | (58) |  |
Non deliverable forward [member] |  |  |  |
Disclosure Of Derivative Financial Instruments [Line Items] |  |  |  |
Assets | 3,711 | 2,950 |  |
Liabilities | (3,384) | (3,745) |  |
Check of swap companies [member] |  |  |  |
Disclosure Of Derivative Financial Instruments [Line Items] |  |  |  |
Assets | 44 | 68 |  |
Liabilities | (162) | (122) |  |
Other derivative financial instruments [Member] |  |  |  |
Disclosure Of Derivative Financial Instruments [Line Items] |  |  |  |
Assets | 492 | 92 |  |
Liabilities | (80) | (64) |  |
Level 1 [Member] |  |  |  |
Disclosure Of Derivative Financial Instruments [Line Items] |  |  |  |
Assets | 15 | 158 |  |
Liabilities | (22) |  |  |
Level 1 [Member] | Futures [Member] |  |  |  |
Disclosure Of Derivative Financial Instruments [Line Items] |  |  |  |
Assets |  | 158 |  |
Level 1 [Member] | Other derivative financial instruments [Member] |  |  |  |
Disclosure Of Derivative Financial Instruments [Line Items] |  |  |  |
Assets | 15 |  |  |
Liabilities | (22) |  |  |
Level 2 [Member] |  |  |  |
Disclosure Of Derivative Financial Instruments [Line Items] |  |  |  |
Assets | 23,309 | 22,249 |  |
Liabilities | (27,471) | (26,643) |  |
Level 2 [Member] | Swap [member] |  |  |  |
Disclosure Of Derivative Financial Instruments [Line Items] |  |  |  |
Assets | 12,959 | 8,821 |  |
Liabilities | (19,351) | (13,590) |  |
Level 2 [Member] | Options [Member] |  |  |  |
Disclosure Of Derivative Financial Instruments [Line Items] |  |  |  |
Assets | 4,163 | 3,271 |  |
Liabilities | (3,906) | (2,792) |  |
Level 2 [Member] | Forward [member] |  |  |  |
Disclosure Of Derivative Financial Instruments [Line Items] |  |  |  |
Assets | 1,835 | 6,911 |  |
Liabilities | (470) | (6,272) |  |
Level 2 [Member] | Credit derivatives financial institutions [member] |  |  |  |
Disclosure Of Derivative Financial Instruments [Line Items] |  |  |  |
Assets | 120 | 137 |  |
Liabilities | (140) | (58) |  |
Level 2 [Member] | Non deliverable forward [member] |  |  |  |
Disclosure Of Derivative Financial Instruments [Line Items] |  |  |  |
Assets | 3,711 | 2,950 |  |
Liabilities | (3,384) | (3,745) |  |
Level 2 [Member] | Check of swap companies [member] |  |  |  |
Disclosure Of Derivative Financial Instruments [Line Items] |  |  |  |
Assets | 44 | 68 |  |
Liabilities | (162) | (122) |  |
Level 2 [Member] | Other derivative financial instruments [Member] |  |  |  |
Disclosure Of Derivative Financial Instruments [Line Items] |  |  |  |
Assets | 477 | 91 |  |
Liabilities | (58) | (64) |  |
Level 3 [Member] |  |  |  |
Disclosure Of Derivative Financial Instruments [Line Items] |  |  |  |
Assets | 142 | 436 |  | R$ 521
Liabilities | (26) | (103) |  | R$ 60
Level 3 [Member] | Swap [member] |  |  |  |
Disclosure Of Derivative Financial Instruments [Line Items] |  |  |  |
Assets | 90 | 369 |  |
Liabilities | (3) | (102) |  |
Level 3 [Member] | Options [Member] |  |  |  |
Disclosure Of Derivative Financial Instruments [Line Items] |  |  |  |
Assets | 52 | 66 |  |
Liabilities | R$ (23) | (1) |  |
Level 3 [Member] | Other derivative financial instruments [Member] |  |  |  |
Disclosure Of Derivative Financial Instruments [Line Items] |  |  |  |
Assets |  | R$ 1 |  |

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