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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, 2019
Dec. 31, 2018
Dec. 31, 2017
Related parties, net      
Changes in liabilities from Cash flow from financing activities      
Beginning of year R$ (26,589) R$ (51,839) R$ (57,541)
Cash transactions      
Proceeds/(Repayment) from financing activities (64,089) 25,755 5,797
Non cash transactions      
Interest expense on loans and Interest on loans with related parties (4,767) (545) (95)
Exchange variation, operations with subsidiaries and associate company and others   40  
End of year (95,445) (26,589) (51,839)
Debt, Debentures and Losses/Gains on financial instruments, net - Derivative instruments      
Changes in liabilities from Cash flow from financing activities      
Beginning of year 14,878,542 16,510,851 20,576,866
Cash transactions      
Proceeds/(Repayment) from financing activities 700,490 (3,439,644) (3,975,541)
Interest paid on loans and financing (945,027) (1,162,364) (1,330,116)
Non cash transactions      
Interest expense on loans and Interest on loans with related parties 938,120 1,177,686 1,323,448
Exchange variation, operations with subsidiaries and associate company and others 474,896 1,792,013 (83,806)
End of year R$ 16,047,021 R$ 14,878,542 R$ 16,510,851