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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
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