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Financial Instruments and Risks Management - Outstanding of assets and liabilities derivatives positions (Details)
R$ in Thousands, $ in Thousands
Dec. 31, 2019
USD ($)
Dec. 31, 2019
BRL (R$)
Dec. 31, 2018
USD ($)
Dec. 31, 2018
BRL (R$)
Financial Instruments and Risks        
Fair value   R$ (1,818,941)   R$ (1,142,766)
Debt hedge        
Financial Instruments and Risks        
Fair value   (2,154,474)   (1,023,848)
Operational Hedge        
Financial Instruments and Risks        
Fair value   67,078   (117,778)
Operational Hedge | Zero-cost collar (R$ x US$)        
Financial Instruments and Risks        
Notional amount | $ $ 3,425,000   $ 3,040,000  
Fair value   67,078   (134,814)
Operational Hedge | NDF (R$ x US$)        
Financial Instruments and Risks        
Notional amount | $     150,000  
Fair value       17,036
Commodity hedge        
Financial Instruments and Risks        
Fair value   268,455   (1,140)
Commodity hedge | Swap US-CPI standing wood (U.S.$)        
Financial Instruments and Risks        
Notional amount | $ 679,485      
Fair value   268,547    
Commodity hedge | Swap Bunker (oil)        
Financial Instruments and Risks        
Notional amount | $ 365   5,344  
Fair value   (92)   (1,140)
Assets | Debt hedge        
Financial Instruments and Risks        
Fair value   25,887,797   119,178
Assets | Debt hedge | Swap CDI x Fixed (U.S.$)        
Financial Instruments and Risks        
Notional amount   11,498,565   8,722,620
Fair value   11,673,117   119,178
Assets | Debt hedge | Pre-fixed Swap to U.S.$ (U.S.$)        
Financial Instruments and Risks        
Notional amount | $ 1,317,226      
Fair value   1,478,336    
Assets | Debt hedge | Swap LIBOR x Fixed (U.S.$)        
Financial Instruments and Risks        
Notional amount | $ 2,750,000   2,757,143  
Fair value   11,063,970    
Assets | Debt hedge | Swap IPCA x CDI (notional in Reais)        
Financial Instruments and Risks        
Notional amount | $ 933,842      
Fair value   1,093,067    
Assets | Debt hedge | Swap IPCA x Fixed (U.S.$)        
Financial Instruments and Risks        
Notional amount | $ 499,441      
Fair value   579,307    
Liabilities | Swap IPCA x CDI (notional in Reais)        
Financial Instruments and Risks        
Notional amount | $ 843,845      
Fair value   (859,812)    
Liabilities | Debt hedge        
Financial Instruments and Risks        
Fair value   (28,042,271)   (1,143,026)
Liabilities | Debt hedge | Swap CDI x Fixed (U.S.$)        
Financial Instruments and Risks        
Notional amount | $ 3,115,614   2,402,110  
Fair value   (13,613,469)   (972,319)
Liabilities | Debt hedge | Swap LIBOR x Fixed (U.S.$)        
Financial Instruments and Risks        
Notional amount | $ 350,000   $ 2,757,143  
Fair value   (1,511,347)   R$ (170,707)
Liabilities | Debt hedge | Swap LIBOR x Fixed (U.S.$)        
Financial Instruments and Risks        
Notional amount | $ 2,750,000      
Fair value   (11,508,880)    
Liabilities | Debt hedge | Swap IPCA x Fixed (U.S.$)        
Financial Instruments and Risks        
Notional amount | $ $ 121,003      
Fair value   R$ (548,763)