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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
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