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Financial Instruments and Risks Management - Exchange Rate Risk Management (Details) - BRL (R$)
R$ in Thousands
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Net exposure of assets and liabilities in foreign currency    
Financial assets R$ 14,298,290 R$ 28,780,120
Financial liabilities R$ (74,082,444) (39,403,941)
Exchange rate risk    
Financial Instruments and Risks Management    
Time horizon for sales in the futures market 18 months  
Exchange rate risk | USD    
Net exposure of assets and liabilities in foreign currency    
Financial assets R$ 13,994,993 3,298,761
Financial liabilities (58,149,396) (28,255,019)
Net liability exposure (44,154,403) (24,956,258)
Exchange rate risk | USD | Trade accounts payable    
Net exposure of assets and liabilities in foreign currency    
Financial liabilities (1,085,207) (72,680)
Exchange rate risk | USD | Loans and financing    
Net exposure of assets and liabilities in foreign currency    
Financial liabilities (45,460,138) (26,384,721)
Exchange rate risk | USD | Liabilities for asset acquisition and subsidiaries    
Net exposure of assets and liabilities in foreign currency    
Financial liabilities (288,172) (333,049)
Exchange rate risk | USD | Derivative financial instruments    
Net exposure of assets and liabilities in foreign currency    
Financial liabilities (11,315,879) (1,464,569)
Exchange rate risk | USD | Cash and cash equivalents    
Net exposure of assets and liabilities in foreign currency    
Financial assets 2,527,834 1,143,968
Exchange rate risk | USD | Trade accounts receivable    
Net exposure of assets and liabilities in foreign currency    
Financial assets 2,027,018 1,661,108
Exchange rate risk | USD | Derivative financial instruments    
Net exposure of assets and liabilities in foreign currency    
Financial assets R$ 9,440,141 R$ 493,685