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Risk and Capital Management- Summary of VaR Total - Historical Simulation (Detail) - BRL (R$) R$ in Millions | Dec. 31, 2019 | Dec. 31, 2018
--- | --- | ---
Disclosure of Value at Risk historical simulation [Line Items] |  |  |
Risk factor group |  | R$ 278.3 | R$ 381.5
Interest rate risk [Member] |  |  |
Disclosure of Value at Risk historical simulation [Line Items] |  |  |
Risk factor group |  | 813.1 | 898.4
Foreign exchange risk [member] |  |  |
Disclosure of Value at Risk historical simulation [Line Items] |  |  |
Risk factor group |  | 10.9 | 37.3
Shares [member] |  |  |
Disclosure of Value at Risk historical simulation [Line Items] |  |  |
Risk factor group |  | 29.4 | 50.1
Commodity price risk [member] |  |  |
Disclosure of Value at Risk historical simulation [Line Items] |  |  |
Risk factor group |  | 1.0 | 1.0
Risk diversification effect [member] |  |  |
Disclosure of Value at Risk historical simulation [Line Items] |  |  |
Risk factor group |  | (576.1) | (605.3)
Average [Member] |  |  |
Disclosure of Value at Risk historical simulation [Line Items] |  |  |
Risk factor group |  | 333.7 | 399.3
Average [Member] | Interest rate risk [Member] |  |  |
Disclosure of Value at Risk historical simulation [Line Items] |  |  |
Risk factor group |  | 815.7 | 851.4
Average [Member] | Foreign exchange risk [member] |  |  |
Disclosure of Value at Risk historical simulation [Line Items] |  |  |
Risk factor group |  | 27.6 | 24.7
Average [Member] | Shares [member] |  |  |
Disclosure of Value at Risk historical simulation [Line Items] |  |  |
Risk factor group |  | 30.2 | 39.2
Average [Member] | Commodity price risk [member] |  |  |
Disclosure of Value at Risk historical simulation [Line Items] |  |  |
Risk factor group |  | 1.8 | 1.6
Average [Member] | Risk diversification effect [member] |  |  |
Disclosure of Value at Risk historical simulation [Line Items] |  |  |
Risk factor group | [1] | 0.0 |
Bottom of range [member] |  |  |
Disclosure of Value at Risk historical simulation [Line Items] |  |  |
Risk factor group |  | 208.7 | 294.7
Bottom of range [member] | Interest rate risk [Member] |  |  |
Disclosure of Value at Risk historical simulation [Line Items] |  |  |
Risk factor group |  | 651.6 | 720.0
Bottom of range [member] | Foreign exchange risk [member] |  |  |
Disclosure of Value at Risk historical simulation [Line Items] |  |  |
Risk factor group |  | 10.9 | 12.7
Bottom of range [member] | Shares [member] |  |  |
Disclosure of Value at Risk historical simulation [Line Items] |  |  |
Risk factor group |  | 13.5 | 23.6
Bottom of range [member] | Commodity price risk [member] |  |  |
Disclosure of Value at Risk historical simulation [Line Items] |  |  |
Risk factor group |  | 0.5 | 0.6
Top of range [member] |  |  |
Disclosure of Value at Risk historical simulation [Line Items] |  |  |
Risk factor group |  | 471.9 | 603.6
Top of range [member] | Interest rate risk [Member] |  |  |
Disclosure of Value at Risk historical simulation [Line Items] |  |  |
Risk factor group |  | 959.7 | 1,042.9
Top of range [member] | Foreign exchange risk [member] |  |  |
Disclosure of Value at Risk historical simulation [Line Items] |  |  |
Risk factor group |  | 59.2 | 45.2
Top of range [member] | Shares [member] |  |  |
Disclosure of Value at Risk historical simulation [Line Items] |  |  |
Risk factor group |  | 57.4 | 58.5
Top of range [member] | Commodity price risk [member] |  |  |
Disclosure of Value at Risk historical simulation [Line Items] |  |  |
Risk factor group |  | 4.7 | R$ 3.1
Top of range [member] | Risk diversification effect [member] |  |  |
Disclosure of Value at Risk historical simulation [Line Items] |  |  |
Risk factor group | [1] | R$ 0.0 |
[1] | VaR by Group of Risk Factors considers information from foreign units.

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- Definition The measure of a potential loss exposure as a result of future market movements, based on a specified confidence interval and measurement horizon. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IFRS -Number 7 -IssueDate 2019-01-01 -Paragraph 41 -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=7&code=ifrs-tx-2019-en-r&anchor=para_41&doctype=Standard -URIDate 2019-03-27 + Details
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