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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, 2018
Dec. 31, 2017
Summary of risks and financial instruments [line items]    
Net liability position R$ (6,058.6) R$ (5,286.6)
CDI [member]    
Summary of risks and financial instruments [line items]    
Net liability position (5,176.4) (4,446.8)
CDI [member] | Cash equivalent [member]    
Summary of risks and financial instruments [line items]    
Net liability position 3,722.3 4,821.6
CDI [member] | Financial Investments [member]    
Summary of risks and financial instruments [line items]    
Net liability position 2,537.3 1,153.0
CDI [member] | Asset position foreign exchange hedging [member]    
Summary of risks and financial instruments [line items]    
Net liability position 33.9 29.9
CDI [member] | Loans and debentures [member]    
Summary of risks and financial instruments [line items]    
Net liability position (8,440.9) (7,987.3)
CDI [member] | Liability position foreign exchange hedging instruments [member]    
Summary of risks and financial instruments [line items]    
Net liability position (2,205.5) (1,877.4)
CDI [member] | Liability position hedging instruments pre fixed [member]    
Summary of risks and financial instruments [line items]    
Net liability position (823.5) (586.6)
TJLP [member]    
Summary of risks and financial instruments [line items]    
Net liability position (201.2) (301.9)
TJLP [member] | Loans tjlp [member]    
Summary of risks and financial instruments [line items]    
Net liability position (201.2) (301.9)
LIBOR [member]    
Summary of risks and financial instruments [line items]    
Net liability position (625.5) (434.2)
LIBOR [member] | Asset position foreign exchange hedging instruments [member]    
Summary of risks and financial instruments [line items]    
Net liability position 811.6 984.3
LIBOR [member] | Loans libor [member]    
Summary of risks and financial instruments [line items]    
Net liability position (1,437.1) (1,418.5)
Tiie [member]    
Summary of risks and financial instruments [line items]    
Net liability position (4.0) (3.4)
Tiie [member] | Loans tiie [member]    
Summary of risks and financial instruments [line items]    
Net liability position (4.0) (3.4)
SELIC [member]    
Summary of risks and financial instruments [line items]    
Net liability position (51.5) (100.3)
SELIC [member] | Loans selic [member]    
Summary of risks and financial instruments [line items]    
Net liability position R$ (51.5) R$ (100.3)