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FINANCIAL INSTRUMENTS - Liquidity risk (Details) - Liquidity risk - BRL (R$) R$ in Thousands | Dec. 31, 2017 | Dec. 31, 2016
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Disclosure of maturity analysis for financial liabilities held for managing liquidity risk |  |
Contractual obligations | R$ 30,125,256 | R$ 34,209,751
Next 12 months |  |
Disclosure of maturity analysis for financial liabilities held for managing liquidity risk |  |
Contractual obligations | 6,998,424 | 9,205,223
1-3 years |  |
Disclosure of maturity analysis for financial liabilities held for managing liquidity risk |  |
Contractual obligations | 6,079,924 | 4,829,403
4-5 years |  |
Disclosure of maturity analysis for financial liabilities held for managing liquidity risk |  |
Contractual obligations | 3,208,433 | 8,536,568
After year 5 |  |
Disclosure of maturity analysis for financial liabilities held for managing liquidity risk |  |
Contractual obligations | 13,838,475 | 11,638,557
Trade accounts payable |  |
Disclosure of maturity analysis for financial liabilities held for managing liquidity risk |  |
Contractual obligations | 3,179,954 | 2,743,818
Trade accounts payable | Next 12 months |  |
Disclosure of maturity analysis for financial liabilities held for managing liquidity risk |  |
Contractual obligations | 3,179,954 | 2,743,818
Loans and Financing |  |
Disclosure of maturity analysis for financial liabilities held for managing liquidity risk |  |
Contractual obligations | 24,470,750 | 29,258,030
Loans and Financing | Next 12 months |  |
Disclosure of maturity analysis for financial liabilities held for managing liquidity risk |  |
Contractual obligations | 3,191,793 | 5,940,222
Loans and Financing | 1-3 years |  |
Disclosure of maturity analysis for financial liabilities held for managing liquidity risk |  |
Contractual obligations | 6,060,186 | 4,818,322
Loans and Financing | 4-5 years |  |
Disclosure of maturity analysis for financial liabilities held for managing liquidity risk |  |
Contractual obligations | 3,168,144 | 8,443,080
Loans and Financing | After year 5 |  |
Disclosure of maturity analysis for financial liabilities held for managing liquidity risk |  |
Contractual obligations | 12,050,627 | 10,056,406
Debentures |  |
Disclosure of maturity analysis for financial liabilities held for managing liquidity risk |  |
Contractual obligations | 59,128 | 277,879
Debentures | 1-3 years |  |
Disclosure of maturity analysis for financial liabilities held for managing liquidity risk |  |
Contractual obligations | 6,528 |
Debentures | 4-5 years |  |
Disclosure of maturity analysis for financial liabilities held for managing liquidity risk |  |
Contractual obligations | 40,289 | 93,488
Debentures | After year 5 |  |
Disclosure of maturity analysis for financial liabilities held for managing liquidity risk |  |
Contractual obligations | 12,311 | 184,391
Unrealized losses on financial instruments |  |
Disclosure of maturity analysis for financial liabilities held for managing liquidity risk |  |
Contractual obligations | 1,267 | 6,584
Unrealized losses on financial instruments | Next 12 months |  |
Disclosure of maturity analysis for financial liabilities held for managing liquidity risk |  |
Contractual obligations | 1,267 | 6,584
FIDC Obligation |  |
Disclosure of maturity analysis for financial liabilities held for managing liquidity risk |  |
Contractual obligations | 1,135,077 | 1,007,259
FIDC Obligation | After year 5 |  |
Disclosure of maturity analysis for financial liabilities held for managing liquidity risk |  |
Contractual obligations | 1,135,077 | 1,007,259
Other current liabilities |  |
Disclosure of maturity analysis for financial liabilities held for managing liquidity risk |  |
Contractual obligations | 625,410 | 514,599
Other current liabilities | Next 12 months |  |
Disclosure of maturity analysis for financial liabilities held for managing liquidity risk |  |
Contractual obligations | 625,410 | 514,599
Other non-current liabilities |  |
Disclosure of maturity analysis for financial liabilities held for managing liquidity risk |  |
Contractual obligations | 653,670 | 401,582
Other non-current liabilities | 1-3 years |  |
Disclosure of maturity analysis for financial liabilities held for managing liquidity risk |  |
Contractual obligations | 13,209 | 11,081
Other non-current liabilities | After year 5 |  |
Disclosure of maturity analysis for financial liabilities held for managing liquidity risk |  |
Contractual obligations | R$ 640,461 | R$ 390,501

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