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Financial Instruments and Risks Management - Exchange Risk Sensitivity Analysis (Details) - Exchange rate risk
 12 Months Ended
Dec. 31, 2019
BRL (R$)
Financial Instruments and Risks Management  
Closing foreign exchange rate 4.0307
Cash and cash equivalents | Probable  
Financial Instruments and Risks Management  
Effect on profit or loss and equity due to changes in fair value of financial assets attributable to an increase in measurement input R$ 2,527,834,000
Cash and cash equivalents | Possible (25%)  
Financial Instruments and Risks Management  
Effect on profit or loss and equity due to changes in fair value of financial assets attributable to an increase in measurement input 631,959,000
Cash and cash equivalents | Remote (50%)  
Financial Instruments and Risks Management  
Effect on profit or loss and equity due to changes in fair value of financial assets attributable to an increase in measurement input 1,263,917,000
Trade accounts receivable | Probable  
Financial Instruments and Risks Management  
Effect on profit or loss and equity due to changes in fair value of financial assets attributable to an increase in measurement input 2,027,018,000
Trade accounts receivable | Possible (25%)  
Financial Instruments and Risks Management  
Effect on profit or loss and equity due to changes in fair value of financial assets attributable to an increase in measurement input 506,755,000
Trade accounts receivable | Remote (50%)  
Financial Instruments and Risks Management  
Effect on profit or loss and equity due to changes in fair value of financial assets attributable to an increase in measurement input 1,013,509,000
Trade accounts payable | Probable  
Financial Instruments and Risks Management  
Effect on profit or loss and equity due to changes in fair value of financial liabilities attributable to an increase in measurement input 1,085,207,000
Trade accounts payable | Possible (25%)  
Financial Instruments and Risks Management  
Effect on profit or loss and equity due to changes in fair value of financial liabilities attributable to an increase in measurement input 271,302,000
Trade accounts payable | Remote (50%)  
Financial Instruments and Risks Management  
Effect on profit or loss and equity due to changes in fair value of financial liabilities attributable to an increase in measurement input 542,604,000
Loans and financing | Probable  
Financial Instruments and Risks Management  
Effect on profit or loss and equity due to changes in fair value of financial liabilities attributable to an increase in measurement input 45,460,138,000
Loans and financing | Possible (25%)  
Financial Instruments and Risks Management  
Effect on profit or loss and equity due to changes in fair value of financial liabilities attributable to an increase in measurement input 11,365,035,000
Loans and financing | Remote (50%)  
Financial Instruments and Risks Management  
Effect on profit or loss and equity due to changes in fair value of financial liabilities attributable to an increase in measurement input 22,730,069,000
Liabilities for asset acquisition and subsidiaries | Probable  
Financial Instruments and Risks Management  
Effect on profit or loss and equity due to changes in fair value of financial liabilities attributable to an increase in measurement input 288,172,000
Liabilities for asset acquisition and subsidiaries | Possible (25%)  
Financial Instruments and Risks Management  
Effect on profit or loss and equity due to changes in fair value of financial liabilities attributable to an increase in measurement input 72,043,000
Liabilities for asset acquisition and subsidiaries | Remote (50%)  
Financial Instruments and Risks Management  
Effect on profit or loss and equity due to changes in fair value of financial liabilities attributable to an increase in measurement input 144,086,000
Derivative Options | Probable  
Financial Instruments and Risks Management  
Effect on profit or loss and equity due to changes in fair value of financial instruments attributable to an increase in measurement input (2,198,750,000)
Derivative Options | Possible (25%)  
Financial Instruments and Risks Management  
Effect on profit or loss and equity due to changes in fair value of financial instruments attributable to an increase in measurement input (4,087,518,000)
Derivative Options | Remote (50%)  
Financial Instruments and Risks Management  
Effect on profit or loss and equity due to changes in fair value of financial instruments attributable to an increase in measurement input (8,175,033,000)
Derivative Options | Possible (-25%)  
Financial Instruments and Risks Management  
Effect on profit or loss and equity due to changes in fair value of financial instruments attributable to a decrease in measurement input (4,087,510,000)
Derivative Options | Remote (-50%)  
Financial Instruments and Risks Management  
Effect on profit or loss and equity due to changes in fair value of financial instruments attributable to a decrease in measurement input (8,175,024,000)
Derivative Swap | Probable  
Financial Instruments and Risks Management  
Effect on profit or loss and equity due to changes in fair value of financial instruments attributable to an increase in measurement input 66,981,000
Derivative Swap | Possible (25%)  
Financial Instruments and Risks Management  
Effect on profit or loss and equity due to changes in fair value of financial instruments attributable to an increase in measurement input (2,710,465,000)
Derivative Swap | Remote (50%)  
Financial Instruments and Risks Management  
Effect on profit or loss and equity due to changes in fair value of financial instruments attributable to an increase in measurement input (6,048,324,000)
Derivative Swap | Possible (-25%)  
Financial Instruments and Risks Management  
Effect on profit or loss and equity due to changes in fair value of financial instruments attributable to a decrease in measurement input (3,011,787,000)
Derivative Swap | Remote (-50%)  
Financial Instruments and Risks Management  
Effect on profit or loss and equity due to changes in fair value of financial instruments attributable to a decrease in measurement input R$ (6,383,188,000)