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Derivatives - Summary of Derivative Contracts Maturity (Detail) - BRL (R$) | Dec. 31, 2019 | Dec. 31, 2018
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Disclosure of maturity analysis for derivative financial liabilities [line items] |  |
Off-balance sheet - notional amount | R$ 20,000,000 |
Futures [Member] |  |
Disclosure of maturity analysis for derivative financial liabilities [line items] |  |
Off-balance sheet - notional amount | 664,884,000,000 | R$ 586,033,000,000
Swap [member] |  |
Disclosure of maturity analysis for derivative financial liabilities [line items] |  |
Off-balance sheet - notional amount | 1,094,378,000,000 | 940,844,000,000
Option contract [member] |  |
Disclosure of maturity analysis for derivative financial liabilities [line items] |  |
Off-balance sheet - notional amount | 1,720,205,000,000 | 1,262,568,000,000
Forward [member] |  |
Disclosure of maturity analysis for derivative financial liabilities [line items] |  |
Off-balance sheet - notional amount | 5,134,000,000 | 2,341,000,000
Credit derivatives [Member] |  |
Disclosure of maturity analysis for derivative financial liabilities [line items] |  |
Off-balance sheet - notional amount | 12,739,000,000 | 8,324,000,000
NDF [Member] |  |
Disclosure of maturity analysis for derivative financial liabilities [line items] |  |
Off-balance sheet - notional amount | 295,508,000,000 | 225,355,000,000
Other derivative financial instruments [Member] |  |
Disclosure of maturity analysis for derivative financial liabilities [line items] |  |
Off-balance sheet - notional amount | 6,581,000,000 | 5,304,000,000
0-30 days [Member] | Futures [Member] |  |
Disclosure of maturity analysis for derivative financial liabilities [line items] |  |
Off-balance sheet - notional amount | 196,055,000,000 | 217,836,000,000
0-30 days [Member] | Swap [member] |  |
Disclosure of maturity analysis for derivative financial liabilities [line items] |  |
Off-balance sheet - notional amount | 24,094,000,000 | 70,403,000,000
0-30 days [Member] | Option contract [member] |  |
Disclosure of maturity analysis for derivative financial liabilities [line items] |  |
Off-balance sheet - notional amount | 988,793,000,000 | 595,515,000,000
0-30 days [Member] | Forward [member] |  |
Disclosure of maturity analysis for derivative financial liabilities [line items] |  |
Off-balance sheet - notional amount | 953,000,000 | 1,412,000,000
0-30 days [Member] | NDF [Member] |  |
Disclosure of maturity analysis for derivative financial liabilities [line items] |  |
Off-balance sheet - notional amount | 105,809,000,000 | 76,032,000,000
0-30 days [Member] | Other derivative financial instruments [Member] |  |
Disclosure of maturity analysis for derivative financial liabilities [line items] |  |
Off-balance sheet - notional amount | 12,000,000 | 8,000,000
31-180 days [Member] | Futures [Member] |  |
Disclosure of maturity analysis for derivative financial liabilities [line items] |  |
Off-balance sheet - notional amount | 238,485,000,000 | 193,637,000,000
31-180 days [Member] | Swap [member] |  |
Disclosure of maturity analysis for derivative financial liabilities [line items] |  |
Off-balance sheet - notional amount | 204,065,000,000 | 97,028,000,000
31-180 days [Member] | Option contract [member] |  |
Disclosure of maturity analysis for derivative financial liabilities [line items] |  |
Off-balance sheet - notional amount | 320,300,000,000 | 131,147,000,000
31-180 days [Member] | Forward [member] |  |
Disclosure of maturity analysis for derivative financial liabilities [line items] |  |
Off-balance sheet - notional amount | 2,514,000,000 | 844,000,000
31-180 days [Member] | Credit derivatives [Member] |  |
Disclosure of maturity analysis for derivative financial liabilities [line items] |  |
Off-balance sheet - notional amount | 4,746,000,000 | 1,188,000,000
31-180 days [Member] | NDF [Member] |  |
Disclosure of maturity analysis for derivative financial liabilities [line items] |  |
Off-balance sheet - notional amount | 129,278,000,000 | 102,024,000,000
31-180 days [Member] | Other derivative financial instruments [Member] |  |
Disclosure of maturity analysis for derivative financial liabilities [line items] |  |
Off-balance sheet - notional amount | 786,000,000 | 405,000,000
181-365 days [Member] | Futures [Member] |  |
Disclosure of maturity analysis for derivative financial liabilities [line items] |  |
Off-balance sheet - notional amount | 87,747,000,000 | 33,969,000,000
181-365 days [Member] | Swap [member] |  |
Disclosure of maturity analysis for derivative financial liabilities [line items] |  |
Off-balance sheet - notional amount | 103,013,000,000 | 96,090,000,000
181-365 days [Member] | Option contract [member] |  |
Disclosure of maturity analysis for derivative financial liabilities [line items] |  |
Off-balance sheet - notional amount | 258,488,000,000 | 329,834,000,000
181-365 days [Member] | Forward [member] |  |
Disclosure of maturity analysis for derivative financial liabilities [line items] |  |
Off-balance sheet - notional amount | 1,651,000,000 | 85,000,000
181-365 days [Member] | Credit derivatives [Member] |  |
Disclosure of maturity analysis for derivative financial liabilities [line items] |  |
Off-balance sheet - notional amount | 733,000,000 | 680,000,000
181-365 days [Member] | NDF [Member] |  |
Disclosure of maturity analysis for derivative financial liabilities [line items] |  |
Off-balance sheet - notional amount | 38,851,000,000 | 30,212,000,000
181-365 days [Member] | Other derivative financial instruments [Member] |  |
Disclosure of maturity analysis for derivative financial liabilities [line items] |  |
Off-balance sheet - notional amount | 320,000,000 | 357,000,000
Non-current [Member] | Futures [Member] |  |
Disclosure of maturity analysis for derivative financial liabilities [line items] |  |
Off-balance sheet - notional amount | 142,597,000,000 | 140,591,000,000
Non-current [Member] | Swap [member] |  |
Disclosure of maturity analysis for derivative financial liabilities [line items] |  |
Off-balance sheet - notional amount | 763,206,000,000 | 677,323,000,000
Non-current [Member] | Option contract [member] |  |
Disclosure of maturity analysis for derivative financial liabilities [line items] |  |
Off-balance sheet - notional amount | 152,624,000,000 | 206,072,000,000
Non-current [Member] | Credit derivatives [Member] |  |
Disclosure of maturity analysis for derivative financial liabilities [line items] |  |
Off-balance sheet - notional amount | 7,260,000,000 | 6,456,000,000
Non-current [Member] | NDF [Member] |  |
Disclosure of maturity analysis for derivative financial liabilities [line items] |  |
Off-balance sheet - notional amount | 21,570,000,000 | 17,087,000,000
Non-current [Member] | Other derivative financial instruments [Member] |  |
Disclosure of maturity analysis for derivative financial liabilities [line items] |  |
Off-balance sheet - notional amount | R$ 5,463,000,000 | R$ 4,534,000,000

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