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v3.20.1

Fair Value of Financial Instruments - Summary of Sensitivity Analyses Operations of Level 3 (Detail) - BRL (R$) R$ in Millions | Dec. 31, 2019 | Dec. 31, 2018
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Interest rate [Member] | Scenarios I [Member] |  |
Disclosure of Fair Value Financial Sensitivity Analysis [Line Items] |  |
Impact, Income | R$ (0.9) | R$ (0.4)
Impact, Stockholders' equity | 0.0 | (1.2)
Interest rate [Member] | Scenarios II [Member] |  |
Disclosure of Fair Value Financial Sensitivity Analysis [Line Items] |  |
Impact, Income | (23.3) | (9.3)
Impact, Stockholders' equity | (0.3) | (29.3)
Interest rate [Member] | Scenarios III [Member] |  |
Disclosure of Fair Value Financial Sensitivity Analysis [Line Items] |  |
Impact, Income | (46.1) | (18.6)
Impact, Stockholders' equity | (0.6) | (57.8)
Shares [member] | Scenarios I [Member] |  |
Disclosure of Fair Value Financial Sensitivity Analysis [Line Items] |  |
Impact, Income | 0.0 | (63.4)
Impact, Stockholders' equity | 0.0 |
Shares [member] | Scenarios II [Member] |  |
Disclosure of Fair Value Financial Sensitivity Analysis [Line Items] |  |
Impact, Income | 0.0 | (126.8)
Impact, Stockholders' equity | 0.0 |
Nonlinear [Member] | Scenarios I [Member] |  |
Disclosure of Fair Value Financial Sensitivity Analysis [Line Items] |  |
Impact, Income | (22.6) | (48.2)
Impact, Stockholders' equity | 0.0 |
Nonlinear [Member] | Scenarios II [Member] |  |
Disclosure of Fair Value Financial Sensitivity Analysis [Line Items] |  |
Impact, Income | (43.2) | R$ (89.3)
Impact, Stockholders' equity | R$ 0.0 |

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