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TAX, CIVIL AND LABOR CLAIMS AND CONTINGENT ASSETS - Provisions (Details) - BRL (R$) R$ in Thousands | 12 Months Ended |  |
--- | --- | --- | ---
Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Other provisions disclosures |  |  |
Provision for tax, civil, and labor liabilities | R$ 827,883 | R$ 2,239,226 |
Reversal of contingent liabilities, net | 929,711 |  |
Reversal of monetary update of contingent liabilities, net | 369,819 |  |
Judicial deposits, ICMS legal proceeding | 1,691,596 |  |
Tax, labor and civil provisions |  |  |
Other provisions disclosures |  |  |
Provision for tax, civil, and labor liabilities | 827,883 | 2,239,226 | R$ 1,904,730
ICMS (state VAT) |  |  |
Other provisions disclosures |  |  |
Provision for tax, civil, and labor liabilities | 2,821 | 67,942 |
Corporate Income Tax and Social Contribution Tax |  |  |
Other provisions disclosures |  |  |
Provision for tax, civil, and labor liabilities | 39,256 | 37,376 |
Emergency Capacity Charge and Extraordinary Rate Adjustment |  |  |
Other provisions disclosures |  |  |
Provision for tax, civil, and labor liabilities | 9,278 | 8,852 |
Financing of social integration program and Social security financing |  |  |
Other provisions disclosures |  |  |
Provision for tax, civil, and labor liabilities | 163,981 | 1,678,778 |
Other tax provisions and Social security contributions |  |  |
Other provisions disclosures |  |  |
Provision for tax, civil, and labor liabilities | 42,285 | 36,823 |
Labor provisions |  |  |
Other provisions disclosures |  |  |
Provision for tax, civil, and labor liabilities | 517,329 | 358,901 |
Civil provisions |  |  |
Other provisions disclosures |  |  |
Provision for tax, civil, and labor liabilities | R$ 52,933 | R$ 50,554 |

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