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PROPERTY, PLANT AND EQUIPMENT - Valuation Technique (Details) - Property, plant and equipment - Recurring fair value measurement - Discounted cash flow model
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Disclosure of significant unobservable inputs used in fair value measurement of assets [line items]    
Terminal Value Multiple 23 21
Investment Horizon 10 years 10 years
Interest rate, measurement input    
Disclosure of significant unobservable inputs used in fair value measurement of assets [line items]    
Discount Rate 7 7