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EMPLOYEE BENEFITS - Defined benefit pension plan - Variation of the plan obligations (Details) - Defined benefit pension plan - BRL (R$)
R$ in Thousands
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
EMPLOYEE BENEFITS      
Obligation at the beginning of the year R$ 1,084,758    
Cost of service 60,803 R$ 60,595 R$ 57,619
Interest expense 82,513 90,381 199,389
Past service cost 7,065 1,082 2,788
Obligation at the end of the year 1,057,849 1,084,758  
Present value of the defined benefit obligations      
EMPLOYEE BENEFITS      
Obligation at the beginning of the year 4,314,592 4,174,653 4,739,299
Cost of service 60,803 60,595 57,619
Interest expense 188,729 195,557 199,389
Payment of benefits (318,198) (335,471) (317,505)
Past service cost 7,065 1,082 2,788
Supplementary amounts of the plan 17,078    
Settlement (61,369) (52,035) 609
Gain (loss) on remeasurement (370,083) 235,549 186,905
Liabilities held for sale   (101,794)  
Exchange Variance 552,634 136,456 (694,451)
Obligation at the end of the year R$ 4,391,251 R$ 4,314,592 R$ 4,174,653