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EMPLOYEE BENEFIT PLANS - Economic actuarial assumptions and biometric data (Details)
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
EMPLOYEE BENEFIT PLANS    
Retirement age 65 years 65 years
Percentage of retirees who are married 90.00% 90.00%
Defined benefit plan    
EMPLOYEE BENEFIT PLANS    
Family composition Men 4 years + old Men 4 years + old
Permanency in the plan 100.00% 100.00%
Defined benefit plan | Discount rate    
EMPLOYEE BENEFIT PLANS    
Discount rate 8.92% 7.16%
Defined benefit plan | Medical cost growth rate    
EMPLOYEE BENEFIT PLANS    
Medical cost growth rate above basic inflation 3.25% 3.25%
Defined benefit plan | Nominal inflation    
EMPLOYEE BENEFIT PLANS    
Nominal inflation 3.25% 3.25%
Defined benefit plan | Ages: 0 to 24 years    
EMPLOYEE BENEFIT PLANS    
Aging factor 1.50% 1.50%
Defined benefit plan | Ages: 25 to 54 years    
EMPLOYEE BENEFIT PLANS    
Aging factor 2.50% 2.50%
Defined benefit plan | Ages: 55 to 79 years    
EMPLOYEE BENEFIT PLANS    
Aging factor 4.50% 4.50%
Defined benefit plan | Ages: Above 80 years    
EMPLOYEE BENEFIT PLANS    
Aging factor 2.50% 2.50%
Defined benefit plan | Mortality    
EMPLOYEE BENEFIT PLANS    
Biometric table of general mortality AT-2000 AT-2000
Biometric table of mortality for disabled persons IAPB 57 IAPB 57
Turnover 1.00% 1.00%