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18. PROVISION FOR ENVIRONMENTAL LIABILITIES AND ASSET RETIREMENT OBLIGATIONS (Details) - BRL (R$) R$ in Thousands | Dec. 31, 2018 | Dec. 31, 2017
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Disclosure of fair value measurement of liabilities [line items] |  |
Provision for environmental liabilities and decommissioning of assets | R$ 281,766 | R$ 337,013
Environmental liabilities |  |
Disclosure of fair value measurement of liabilities [line items] |  |
Provision for environmental liabilities and decommissioning of assets | 198,386 | 255,517
Asset retirement obligations |  |
Disclosure of fair value measurement of liabilities [line items] |  |
Provision for environmental liabilities and decommissioning of assets | R$ 83,380 | R$ 81,496

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- Definition The amount of non-current provisions other than provisions for employee benefits. [Refer: Non-current provisions] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 1 -IssueDate 2018-01-01 -Paragraph 78 -Subparagraph d -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=1&date=2018-03-01&anchor=para_78_d&doctype=Standard -URIDate 2018-03-16 + Details
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