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FINANCIAL INSTRUMENTS - Changes in liabilities from Cash Flow from financing activities (Details) - BRL (R$)
R$ in Thousands
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Related parties, net      
Changes in liabilities from Cash flow from financing activities      
Beginning of year R$ (51,839) R$ (57,541) R$ (53,506)
Cash transactions      
Proceeds/(Repayment) from financing activities 25,755 5,797 (6,492)
Non cash transactions      
Interest expense on loans and Interest on loans with related parties (545) (95) 2,457
Exchange variation, operations with subsidiaries and associate company and others 40    
End of year (26,589) (51,839) (57,541)
Debt, Debentures And Losses/Gains On Financial Instruments, Net      
Changes in liabilities from Cash flow from financing activities      
Beginning of year 16,510,851 20,576,866 26,417,256
Cash transactions      
Proceeds/(Repayment) from financing activities (3,439,644) (3,975,541) (2,150,035)
Interest paid on loans and financing (1,162,364) (1,330,116) (1,240,165)
Non cash transactions      
Interest expense on loans and Interest on loans with related parties 1,177,686 1,323,448 1,540,797
Exchange variation, operations with subsidiaries and associate company and others 1,825,430 (83,806) (3,990,987)
End of year R$ 14,911,959 R$ 16,510,851 R$ 20,576,866