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FINANCIAL INSTRUMENTS - Liquidity risk (Details) - Liquidity risk - BRL (R$) R$ in Thousands | Dec. 31, 2019 | Dec. 31, 2018
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Disclosure of maturity analysis for financial liabilities held for managing liquidity risk |  |
Contractual obligations | R$ 30,220,463 | R$ 29,105,095
Next 12 months |  |
Disclosure of maturity analysis for financial liabilities held for managing liquidity risk |  |
Contractual obligations | 7,097,967 | 8,035,610
1-3 years |  |
Disclosure of maturity analysis for financial liabilities held for managing liquidity risk |  |
Contractual obligations | 4,738,175 | 5,298,939
4-5 years |  |
Disclosure of maturity analysis for financial liabilities held for managing liquidity risk |  |
Contractual obligations | 4,624,640 | 4,110,594
More than 5 years |  |
Disclosure of maturity analysis for financial liabilities held for managing liquidity risk |  |
Contractual obligations | 13,759,681 | 11,659,952
Trade accounts payable |  |
Disclosure of maturity analysis for financial liabilities held for managing liquidity risk |  |
Contractual obligations | 3,762,768 | 4,335,054
Trade accounts payable | Next 12 months |  |
Disclosure of maturity analysis for financial liabilities held for managing liquidity risk |  |
Contractual obligations | 3,762,768 | 4,335,054
Loans and Financing |  |
Disclosure of maturity analysis for financial liabilities held for managing liquidity risk |  |
Contractual obligations | 20,061,659 | 20,613,734
Loans and Financing | Next 12 months |  |
Disclosure of maturity analysis for financial liabilities held for managing liquidity risk |  |
Contractual obligations | 2,312,877 | 2,817,346
Loans and Financing | 1-3 years |  |
Disclosure of maturity analysis for financial liabilities held for managing liquidity risk |  |
Contractual obligations | 2,659,844 | 5,053,827
Loans and Financing | 4-5 years |  |
Disclosure of maturity analysis for financial liabilities held for managing liquidity risk |  |
Contractual obligations | 3,793,164 | 2,509,962
Loans and Financing | More than 5 years |  |
Disclosure of maturity analysis for financial liabilities held for managing liquidity risk |  |
Contractual obligations | 11,295,774 | 10,232,599
Debentures |  |
Disclosure of maturity analysis for financial liabilities held for managing liquidity risk |  |
Contractual obligations | 3,457,033 | 1,940,474
Debentures | Next 12 months |  |
Disclosure of maturity analysis for financial liabilities held for managing liquidity risk |  |
Contractual obligations | 152,928 | 104,995
Debentures | 1-3 years |  |
Disclosure of maturity analysis for financial liabilities held for managing liquidity risk |  |
Contractual obligations | 1,764,003 | 231,817
Debentures | 4-5 years |  |
Disclosure of maturity analysis for financial liabilities held for managing liquidity risk |  |
Contractual obligations | 686,732 | 1,600,632
Debentures | More than 5 years |  |
Disclosure of maturity analysis for financial liabilities held for managing liquidity risk |  |
Contractual obligations | 853,370 | 3,030
Unrealized losses on financial instruments - Derivative instruments |  |
Disclosure of maturity analysis for financial liabilities held for managing liquidity risk |  |
Contractual obligations |  | 5,245
Unrealized losses on financial instruments - Derivative instruments | Next 12 months |  |
Disclosure of maturity analysis for financial liabilities held for managing liquidity risk |  |
Contractual obligations |  | 5,245
Obligation with FIDC |  |
Disclosure of maturity analysis for financial liabilities held for managing liquidity risk |  |
Contractual obligations | 1,018,501 | 938,526
Obligation with FIDC | More than 5 years |  |
Disclosure of maturity analysis for financial liabilities held for managing liquidity risk |  |
Contractual obligations | 1,018,501 | 938,526
Lease liabilities (current liability) |  |
Disclosure of maturity analysis for financial liabilities held for managing liquidity risk |  |
Contractual obligations | 202,536 |
Lease liabilities (current liability) | Next 12 months |  |
Disclosure of maturity analysis for financial liabilities held for managing liquidity risk |  |
Contractual obligations | 202,536 |
Other current liabilities |  |
Disclosure of maturity analysis for financial liabilities held for managing liquidity risk |  |
Contractual obligations | 666,858 | 772,970
Other current liabilities | Next 12 months |  |
Disclosure of maturity analysis for financial liabilities held for managing liquidity risk |  |
Contractual obligations | 666,858 | 772,970
Lease liabilities (non-current liability) |  |
Disclosure of maturity analysis for financial liabilities held for managing liquidity risk |  |
Contractual obligations | 601,733 |
Lease liabilities (non-current liability) | 1-3 years |  |
Disclosure of maturity analysis for financial liabilities held for managing liquidity risk |  |
Contractual obligations | 294,249 |
Lease liabilities (non-current liability) | 4-5 years |  |
Disclosure of maturity analysis for financial liabilities held for managing liquidity risk |  |
Contractual obligations | 144,744 |
Lease liabilities (non-current liability) | More than 5 years |  |
Disclosure of maturity analysis for financial liabilities held for managing liquidity risk |  |
Contractual obligations | 162,740 |
Other non-current liabilities |  |
Disclosure of maturity analysis for financial liabilities held for managing liquidity risk |  |
Contractual obligations | 449,375 | 499,092
Other non-current liabilities | 1-3 years |  |
Disclosure of maturity analysis for financial liabilities held for managing liquidity risk |  |
Contractual obligations | 20,079 | 13,295
Other non-current liabilities | More than 5 years |  |
Disclosure of maturity analysis for financial liabilities held for managing liquidity risk |  |
Contractual obligations | R$ 429,296 | R$ 485,797

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