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SUMMARY OF QUANTITATIVE INFORMATION ABOUT LEVEL 3 FAIR VALUE MEASUREMENTS OF POST-EMPLOYMENT BENEFITS (Details) - Fair Value, Inputs, Level 3 [Member]
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Defined Benefit Plan Disclosure [Line Items]    
Discount Rate 5.98% 4.93%
Expected Return on Plan Assets   4.93%
Wage Increase Rate 7.00% 9.00%
Disability Rate 5.00% 5.00%
Normal retirement age 58 years 58 years
Age 20 - 29 [Member]    
Defined Benefit Plan Disclosure [Line Items]    
Withdrawal Rate 5.00% 5.00%
Age 30 - 39 [Member]    
Defined Benefit Plan Disclosure [Line Items]    
Withdrawal Rate 4.00% 4.00%
Age 40 - 44 [Member]    
Defined Benefit Plan Disclosure [Line Items]    
Withdrawal Rate 3.00% 3.00%
Age 45 - 49 [Member]    
Defined Benefit Plan Disclosure [Line Items]    
Withdrawal Rate 2.00% 2.00%
Age 50 - 57 [Member]    
Defined Benefit Plan Disclosure [Line Items]    
Withdrawal Rate 1.00% 1.00%
Age > 57 [Member]    
Defined Benefit Plan Disclosure [Line Items]    
Withdrawal Rate 0.00% 0.00%