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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, 2019
Dec. 31, 2018
Dec. 31, 2017
EMPLOYEE BENEFITS      
Obligation at the beginning of the year R$ 1,057,849    
Cost of service 54,518 R$ 60,803 R$ 60,595
Interest expense 189,544 82,513 90,381
Past service cost 2,302 7,065 1,082
Obligation at the end of the year 1,138,592 1,057,849  
Present value of the defined benefit obligations      
EMPLOYEE BENEFITS      
Obligation at the beginning of the year 4,391,251 4,314,592 4,174,653
Cost of service 54,518 60,803 60,595
Interest expense 189,544 188,729 195,557
Payment of benefits (309,817) (318,198) (335,471)
Past service cost 2,302 7,065 1,082
Supplementary amounts of the plan   17,078  
Settlement (498,493) (61,369) (52,035)
Gain (loss) on remeasurement 546,911 (370,083) 235,549
Liabilities held for sale     (101,794)
Exchange Variance 225,750 552,634 136,456
Obligation at the end of the year R$ 4,601,966 R$ 4,391,251 R$ 4,314,592