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EMPLOYEE BENEFIT PLANS - Economic actuarial assumptions and biometric data (Details)
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Employee benefits    
Retirement age 65 years 65 years
Percentage of retirees who are married 90.00% 90.00%
Defined benefit plan    
Employee benefits    
Family composition Men 4 years + old Men 4 years + old
Permanency in the plan 100.00% 100.00%
Defined benefit plan | Discount rate    
Employee benefits    
Discount rate 4.39% 3.56%
Defined benefit plan | Medical cost growth rate    
Employee benefits    
Medical cost growth rate above basic inflation 3.25% 3.25%
Defined benefit plan | Mortality    
Employee benefits    
Biometric table of general mortality AT-2000 AT-2000
Biometric table of mortality for disabled persons IAPB 57 IAPB 57
Biometric table of entry of disabled persons Mercer Disability Mercer Disability
Turnover 1.00% 1.00%
Defined benefit plan | Nominal inflation    
Employee benefits    
Nominal inflation 3.25% 3.50%
Defined benefit plan | Ages: 0 to 24 years    
Employee benefits    
Aging factor 1.50% 1.50%
Defined benefit plan | Ages: 25 to 54 years    
Employee benefits    
Aging factor 2.50% 2.50%
Defined benefit plan | Ages: 55 to 79 years    
Employee benefits    
Aging factor 4.50% 4.50%
Defined benefit plan | Ages: Above 80 years    
Employee benefits    
Aging factor 2.50% 2.50%