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FINANCIAL INSTRUMENTS - Liquidity risk (Details) - Liquidity risk - BRL (R$) R$ in Thousands | Dec. 31, 2018 | Dec. 31, 2017
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Disclosure of maturity analysis for financial liabilities held for managing liquidity risk |  |
Contractual obligations | R$ 29,321,092 | R$ 30,125,257
Next 12 months |  |
Disclosure of maturity analysis for financial liabilities held for managing liquidity risk |  |
Contractual obligations | 8,251,607 | 6,998,424
1-3 years |  |
Disclosure of maturity analysis for financial liabilities held for managing liquidity risk |  |
Contractual obligations | 6,126,076 | 6,079,924
4-5 years |  |
Disclosure of maturity analysis for financial liabilities held for managing liquidity risk |  |
Contractual obligations | 4,221,983 | 3,208,433
More than 5 years |  |
Disclosure of maturity analysis for financial liabilities held for managing liquidity risk |  |
Contractual obligations | 10,721,426 | 13,838,476
Trade accounts payable |  |
Disclosure of maturity analysis for financial liabilities held for managing liquidity risk |  |
Contractual obligations | 4,335,054 | 3,179,954
Trade accounts payable | Next 12 months |  |
Disclosure of maturity analysis for financial liabilities held for managing liquidity risk |  |
Contractual obligations | 4,335,054 | 3,179,954
Loans and Financing |  |
Disclosure of maturity analysis for financial liabilities held for managing liquidity risk |  |
Contractual obligations | 20,613,734 | 24,470,751
Loans and Financing | Next 12 months |  |
Disclosure of maturity analysis for financial liabilities held for managing liquidity risk |  |
Contractual obligations | 2,817,346 | 3,191,793
Loans and Financing | 1-3 years |  |
Disclosure of maturity analysis for financial liabilities held for managing liquidity risk |  |
Contractual obligations | 5,053,827 | 6,060,187
Loans and Financing | 4-5 years |  |
Disclosure of maturity analysis for financial liabilities held for managing liquidity risk |  |
Contractual obligations | 2,509,962 | 3,168,144
Loans and Financing | More than 5 years |  |
Disclosure of maturity analysis for financial liabilities held for managing liquidity risk |  |
Contractual obligations | 10,232,599 | 12,050,627
Debentures |  |
Disclosure of maturity analysis for financial liabilities held for managing liquidity risk |  |
Contractual obligations | 1,940,474 | 59,128
Debentures | Next 12 months |  |
Disclosure of maturity analysis for financial liabilities held for managing liquidity risk |  |
Contractual obligations | 104,995 |
Debentures | 1-3 years |  |
Disclosure of maturity analysis for financial liabilities held for managing liquidity risk |  |
Contractual obligations | 231,817 | 6,528
Debentures | 4-5 years |  |
Disclosure of maturity analysis for financial liabilities held for managing liquidity risk |  |
Contractual obligations | 1,600,632 | 40,289
Debentures | More than 5 years |  |
Disclosure of maturity analysis for financial liabilities held for managing liquidity risk |  |
Contractual obligations | 3,030 | 12,311
Unrealized losses on financial instruments |  |
Disclosure of maturity analysis for financial liabilities held for managing liquidity risk |  |
Contractual obligations | 5,245 | 1,267
Unrealized losses on financial instruments | Next 12 months |  |
Disclosure of maturity analysis for financial liabilities held for managing liquidity risk |  |
Contractual obligations | 5,245 | 1,267
Obligation with FIDC |  |
Disclosure of maturity analysis for financial liabilities held for managing liquidity risk |  |
Contractual obligations | 938,526 | 1,135,077
Obligation with FIDC | 1-3 years |  |
Disclosure of maturity analysis for financial liabilities held for managing liquidity risk |  |
Contractual obligations | 827,137 |
Obligation with FIDC | 4-5 years |  |
Disclosure of maturity analysis for financial liabilities held for managing liquidity risk |  |
Contractual obligations | 111,389 |
Obligation with FIDC | More than 5 years |  |
Disclosure of maturity analysis for financial liabilities held for managing liquidity risk |  |
Contractual obligations |  | 1,135,077
Other current liabilities |  |
Disclosure of maturity analysis for financial liabilities held for managing liquidity risk |  |
Contractual obligations | 988,967 | 625,410
Other current liabilities | Next 12 months |  |
Disclosure of maturity analysis for financial liabilities held for managing liquidity risk |  |
Contractual obligations | 988,967 | 625,410
Other non-current liabilities |  |
Disclosure of maturity analysis for financial liabilities held for managing liquidity risk |  |
Contractual obligations | 499,092 | 653,670
Other non-current liabilities | 1-3 years |  |
Disclosure of maturity analysis for financial liabilities held for managing liquidity risk |  |
Contractual obligations | 13,295 | 13,209
Other non-current liabilities | More than 5 years |  |
Disclosure of maturity analysis for financial liabilities held for managing liquidity risk |  |
Contractual obligations | R$ 485,797 | R$ 640,461

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