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EMPLOYEE BENEFIT PLANS - Economic actuarial assumptions and biometric data (Details) - Defined benefit plan
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Employee benefits    
Retirement age 65 years 65 years
Family composition 90.00% 90.00%
Turnover 1.00% 1.00%
Permanency in the plan 100.00% 100.00%
Discount rate    
Employee benefits    
Discount rate 3.56% 4.91%
Medical cost growth rate    
Employee benefits    
Medical cost growth rate above basic inflation 3.25% 3.25%
Mortality    
Employee benefits    
Biometric table of general mortality AT-2000 AT-2000
Biometric table of mortality for disabled persons IAPB 57 IAPB 57
Economic inflation    
Employee benefits    
Economic inflation 3.50% 4.00%
0 to 24 years    
Employee benefits    
Aging factor 1.50% 1.50%
Age 25 to 54 years    
Employee benefits    
Aging factor 2.50% 2.50%
Age 55 to 79 years    
Employee benefits    
Aging factor 4.50% 4.50%
Above 80 years    
Employee benefits    
Aging factor 2.50% 2.50%