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31. Risks and Financial Instruments (Details 2) - BRL (R$)
R$ in Millions
Dec. 31, 2017
Dec. 31, 2016
SummaryOfRisksAndFinancialInstrumentsLineItems [Line Items]    
Net liability position R$ (5,286.6) R$ (3,837.2)
CDI    
SummaryOfRisksAndFinancialInstrumentsLineItems [Line Items]    
Net liability position (4,446.8) (3,003.3)
CDI | Cash equivalents    
SummaryOfRisksAndFinancialInstrumentsLineItems [Line Items]    
Net liability position 4,821.6 3,837.8
CDI | Financial investments    
SummaryOfRisksAndFinancialInstrumentsLineItems [Line Items]    
Net liability position 1,153.0 1,174.5
CDI | Asset position of foreign exchange hedging instruments—CDI    
SummaryOfRisksAndFinancialInstrumentsLineItems [Line Items]    
Net liability position 29.9 28.3
CDI | Loans and debentures    
SummaryOfRisksAndFinancialInstrumentsLineItems [Line Items]    
Net liability position (7,987.3) (5,862.3)
CDI | Liability position of foreign exchange hedging instruments—CDI    
SummaryOfRisksAndFinancialInstrumentsLineItems [Line Items]    
Net liability position (1,877.4) (2,181.6)
CDI | Liability position of hedging instruments from pre-fixed interest to CDI    
SummaryOfRisksAndFinancialInstrumentsLineItems [Line Items]    
Net liability position (586.6) 0.0
TJLP    
SummaryOfRisksAndFinancialInstrumentsLineItems [Line Items]    
Net liability position (301.9) (404.4)
TJLP | Loans - TJLP    
SummaryOfRisksAndFinancialInstrumentsLineItems [Line Items]    
Net liability position (301.9) (404.4)
LIBOR    
SummaryOfRisksAndFinancialInstrumentsLineItems [Line Items]    
Net liability position (434.2) (320.4)
LIBOR | Asset position of foreign exchange hedging instruments—LIBOR    
SummaryOfRisksAndFinancialInstrumentsLineItems [Line Items]    
Net liability position 984.3 1,149.7
LIBOR | Loans - LIBOR    
SummaryOfRisksAndFinancialInstrumentsLineItems [Line Items]    
Net liability position (1,418.5) (1,470.1)
TIIE    
SummaryOfRisksAndFinancialInstrumentsLineItems [Line Items]    
Net liability position (3.4) (9.6)
TIIE | Loans - TIIE    
SummaryOfRisksAndFinancialInstrumentsLineItems [Line Items]    
Net liability position (3.4) (9.6)
SELIC    
SummaryOfRisksAndFinancialInstrumentsLineItems [Line Items]    
Net liability position (100.3) (99.5)
SELIC | Loans - SELIC    
SummaryOfRisksAndFinancialInstrumentsLineItems [Line Items]    
Net liability position R$ (100.3) R$ (99.5)