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FINANCIAL INSTRUMENTS AND RISKS MANAGEMENT - Exchange Risk Sensitivity Analysis (Details) | 6 Months Ended |
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Jun. 30, 2020 BRL (R$) | Dec. 31, 2019
Probable |  |
Financial Instruments and Risks Management |  |
Closing foreign exchange rate | 5.4416 |
Possible (25%) |  |
Financial Instruments and Risks Management |  |
Closing foreign exchange rate | 6.802 |
Remote (50%) |  |
Financial Instruments and Risks Management |  |
Closing foreign exchange rate | 8.1624 |
Possible (-25%) |  |
Financial Instruments and Risks Management |  |
Closing foreign exchange rate | 4.0812 |
Remote (-50%) |  |
Financial Instruments and Risks Management |  |
Closing foreign exchange rate | 2.7208 |
Currency Risk |  |
Financial Instruments and Risks Management |  |
Closing foreign exchange rate | 5.4760 |
Currency Risk | Cash and cash equivalents | Probable |  |
Financial Instruments and Risks Management |  |
Effect on profit or loss and equity due to changes in fair value of financial assets attributable to an increase in measurement input | R$ 9,895,463,000 |
Currency Risk | 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 | 2,473,866,000 |
Currency Risk | 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 | 4,947,732,000 |
Currency Risk | 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 | 2,891,501,000 |
Currency Risk | 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 | 722,875,000 |
Currency Risk | 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 | 1,445,751,000 |
Currency Risk | 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 | (491,805,000) |
Currency Risk | 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 | (122,951,000) |
Currency Risk | 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 | (245,903,000) |
Currency Risk | 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 | (63,817,265,000) |
Currency Risk | 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 | (15,954,316,000) |
Currency Risk | 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 | (31,908,633,000) |
Currency Risk | 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 | (401,273,000) |
Currency Risk | 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 | (100,318,000) |
Currency Risk | 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 | (200,637,000) |
Currency Risk | 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 | (2,955,980,000) |
Currency Risk | 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 | (4,195,471,000) |
Currency Risk | 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 | (8,658,160,000) |
Currency Risk | 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 | 3,740,215,000 |
Currency Risk | 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 | 7,973,398,000 |
Currency Risk | Derivatives Non Deliverable Forward ("NDF") | 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 | (29,511,000) |
Currency Risk | Derivatives Non Deliverable Forward ("NDF") | 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 | (33,907,000) |
Currency Risk | Derivatives Non Deliverable Forward ("NDF") | 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 | (67,814,000) |
Currency Risk | Derivatives Non Deliverable Forward ("NDF") | 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 | 33,908,000 |
Currency Risk | Derivatives Non Deliverable Forward ("NDF") | 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$ 67,815,000 |
Currency Risk | Mark to Market Derivatives |  |
Financial Instruments and Risks Management |  |
Closing foreign exchange rate | 5.4416 | 4.0307
Percentage increase in foreign exchange rate | 35.00% |
Maximum percentage exposure in U.S. Dollars | 75.00% |
Currency Risk | 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 | R$ (8,526,926,000) |
Currency Risk | 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 | (5,279,964,000) |
Currency Risk | 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 | (10,559,931,000) |
Currency Risk | 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 | 5,279,972,000 |
Currency Risk | 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$ 10,559,940,000 |

X
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