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17 PROVISION FOR ENVIRONMENTAL LIABILITIES AND ASSET RETIREMENT OBLIGATIONS (Details) - BRL (R$)
R$ in Thousands
Dec. 31, 2019
Dec. 31, 2018
ProvisionForEnvironmentalLiabilitiesAndAssetRetirementObligationsLineItems [Line Items]    
Provision for environmental liabilities and decommissioning of assets R$ 524,001 R$ 281,766
Environmental liabilities [Member]    
ProvisionForEnvironmentalLiabilitiesAndAssetRetirementObligationsLineItems [Line Items]    
Provision for environmental liabilities and decommissioning of assets 192,270 198,386
Asset retirement obligations [Member]    
ProvisionForEnvironmentalLiabilitiesAndAssetRetirementObligationsLineItems [Line Items]    
Provision for environmental liabilities and decommissioning of assets R$ 331,731 R$ 83,380