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Risks and Financial Instruments - Financial assets and liabilities exposed to floating interest rates (Detail) - BRL (R$)
R$ in Millions
Dec. 31, 2019
Dec. 31, 2018
Summary of risks and financial instruments [line items]    
Net liability position R$ (6,739.2) R$ (6,058.6)
DI [member]    
Summary of risks and financial instruments [line items]    
Net liability position (5,997.9) (5,176.4)
DI [member] | Cash equivalent [member]    
Summary of risks and financial instruments [line items]    
Net liability position 1,780.9 3,722.3
DI [member] | Financial Investments [member]    
Summary of risks and financial instruments [line items]    
Net liability position 2,610.7 2,537.3
DI [member] | Asset position foreign exchange hedging [member]    
Summary of risks and financial instruments [line items]    
Net liability position 19.3 33.9
DI [member] | Loans and debentures [member]    
Summary of risks and financial instruments [line items]    
Net liability position (6,268.6) (8,440.9)
DI [member] | Liability position foreign exchange hedging instruments [member]    
Summary of risks and financial instruments [line items]    
Net liability position (3,318.3) (2,205.5)
DI [member] | Liability position hedging instruments pre fixed [member]    
Summary of risks and financial instruments [line items]    
Net liability position (821.9) (823.5)
TJLP [member]    
Summary of risks and financial instruments [line items]    
Net liability position (103.9) (201.2)
TJLP [member] | Loans tjlp [member]    
Summary of risks and financial instruments [line items]    
Net liability position (103.9) (201.2)
LIBOR [member]    
Summary of risks and financial instruments [line items]    
Net liability position (607.0) (625.5)
LIBOR [member] | Asset position foreign exchange hedging instruments [member]    
Summary of risks and financial instruments [line items]    
Net liability position 850.3 811.6
LIBOR [member] | Loans libor [member]    
Summary of risks and financial instruments [line items]    
Net liability position (1,457.3) (1,437.1)
Tiie [member]    
Summary of risks and financial instruments [line items]    
Net liability position 0.0 (4.0)
Tiie [member] | Loans tiie [member]    
Summary of risks and financial instruments [line items]    
Net liability position 0.0 (4.0)
SELIC [member]    
Summary of risks and financial instruments [line items]    
Net liability position (30.4) (51.5)
SELIC [member] | Loans selic [member]    
Summary of risks and financial instruments [line items]    
Net liability position R$ (30.4) R$ (51.5)