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FINANCIAL INSTRUMENTS - Liquidity risk (Details) - Liquidity risk - BRL (R$) R$ in Thousands | Dec. 31, 2020 | Dec. 31, 2019
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Disclosure of maturity analysis for financial liabilities held for managing liquidity risk |  |
Contractual obligations | R$ 32,800,346 | R$ 29,416,194
Less than 1 year |  |
Disclosure of maturity analysis for financial liabilities held for managing liquidity risk |  |
Contractual obligations | 9,377,095 | 6,895,431
1-3 years |  |
Disclosure of maturity analysis for financial liabilities held for managing liquidity risk |  |
Contractual obligations | 5,724,459 | 4,443,926
4-5 years |  |
Disclosure of maturity analysis for financial liabilities held for managing liquidity risk |  |
Contractual obligations | 3,563,916 | 4,479,896
More than 5 years |  |
Disclosure of maturity analysis for financial liabilities held for managing liquidity risk |  |
Contractual obligations | 14,134,876 | 13,596,941
Trade accounts payable |  |
Disclosure of maturity analysis for financial liabilities held for managing liquidity risk |  |
Contractual obligations | 5,437,953 | 3,762,768
Trade accounts payable | Less than 1 year |  |
Disclosure of maturity analysis for financial liabilities held for managing liquidity risk |  |
Contractual obligations | 5,437,953 | 3,762,768
Loans and Financing |  |
Disclosure of maturity analysis for financial liabilities held for managing liquidity risk |  |
Contractual obligations | 21,962,204 | 20,061,659
Loans and Financing | Less than 1 year |  |
Disclosure of maturity analysis for financial liabilities held for managing liquidity risk |  |
Contractual obligations | 2,131,402 | 2,312,877
Loans and Financing | 1-3 years |  |
Disclosure of maturity analysis for financial liabilities held for managing liquidity risk |  |
Contractual obligations | 3,465,577 | 2,659,844
Loans and Financing | 4-5 years |  |
Disclosure of maturity analysis for financial liabilities held for managing liquidity risk |  |
Contractual obligations | 3,531,312 | 3,793,164
Loans and Financing | More than 5 years |  |
Disclosure of maturity analysis for financial liabilities held for managing liquidity risk |  |
Contractual obligations | 12,833,913 | 11,295,774
Debentures |  |
Disclosure of maturity analysis for financial liabilities held for managing liquidity risk |  |
Contractual obligations | 3,077,960 | 3,457,033
Debentures | Less than 1 year |  |
Disclosure of maturity analysis for financial liabilities held for managing liquidity risk |  |
Contractual obligations | 66,145 | 152,928
Debentures | 1-3 years |  |
Disclosure of maturity analysis for financial liabilities held for managing liquidity risk |  |
Contractual obligations | 2,174,184 | 1,764,003
Debentures | 4-5 years |  |
Disclosure of maturity analysis for financial liabilities held for managing liquidity risk |  |
Contractual obligations | 32,604 | 686,732
Debentures | More than 5 years |  |
Disclosure of maturity analysis for financial liabilities held for managing liquidity risk |  |
Contractual obligations | 805,027 | 853,370
Related parties |  |
Disclosure of maturity analysis for financial liabilities held for managing liquidity risk |  |
Contractual obligations | 22,855 |
Related parties | More than 5 years |  |
Disclosure of maturity analysis for financial liabilities held for managing liquidity risk |  |
Contractual obligations | 22,855 |
Obligation with FIDC |  |
Disclosure of maturity analysis for financial liabilities held for managing liquidity risk |  |
Contractual obligations | 987,406 | 1,018,501
Obligation with FIDC | Less than 1 year |  |
Disclosure of maturity analysis for financial liabilities held for managing liquidity risk |  |
Contractual obligations | 944,513 |
Obligation with FIDC | 1-3 years |  |
Disclosure of maturity analysis for financial liabilities held for managing liquidity risk |  |
Contractual obligations | 42,893 |
Obligation with FIDC | More than 5 years |  |
Disclosure of maturity analysis for financial liabilities held for managing liquidity risk |  |
Contractual obligations |  | 1,018,501
Other current liabilities |  |
Disclosure of maturity analysis for financial liabilities held for managing liquidity risk |  |
Contractual obligations | 797,082 | 666,858
Other current liabilities | Less than 1 year |  |
Disclosure of maturity analysis for financial liabilities held for managing liquidity risk |  |
Contractual obligations | 797,082 | 666,858
Other non-current liabilities |  |
Disclosure of maturity analysis for financial liabilities held for managing liquidity risk |  |
Contractual obligations | 514,886 | 449,375
Other non-current liabilities | 1-3 years |  |
Disclosure of maturity analysis for financial liabilities held for managing liquidity risk |  |
Contractual obligations | 41,805 | 20,079
Other non-current liabilities | More than 5 years |  |
Disclosure of maturity analysis for financial liabilities held for managing liquidity risk |  |
Contractual obligations | R$ 473,081 | R$ 429,296

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