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21. PROVISION FOR ENVIRONMENTAL LIABILITIES AND ASSET RETIREMMENT OBLIGATIONS (Details) - BRL (R$) R$ in Thousands | Dec. 31, 2020 | Dec. 31, 2019
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ProvisionForEnvironmentalLiabitiesAndAssetRetiremmentObligationsLineItems [Line Items] |  |
Provision for environmental liabilities and decommissioning of assets | R$ 803,835 | R$ 524,001
Environmental liabilities [member] |  |
ProvisionForEnvironmentalLiabitiesAndAssetRetiremmentObligationsLineItems [Line Items] |  |
Provision for environmental liabilities and decommissioning of assets | 192,830 | 192,270
Asset retirement obligations [member] |  |
ProvisionForEnvironmentalLiabitiesAndAssetRetiremmentObligationsLineItems [Line Items] |  |
Provision for environmental liabilities and decommissioning of assets | R$ 611,005 | R$ 331,731

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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 2020-01-01 -Paragraph 78 -Subparagraph d -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=1&code=ifrs-tx-2020-en-r&anchor=para_78_d&doctype=Standard -URIDate 2020-01-01 + Details
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