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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
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