PENSION AND OTHER POST-RETIREMENT BENEFIT PLANS - SCHEDULE OF WEIGHTED AVERAGE ASSUMPTIONS USED IN COMPUTING BENEFIT OBLIGATIONS (Details)	Dec. 31, 2020	Dec. 31, 2019
Defined Benefit Plan Disclosure [Line Items]
Interest crediting rate	4.70%	4.70%
Pension Benefits
Defined Benefit Plan Disclosure [Line Items]
Discount rate	2.30%	3.10%
Rate of increase in compensation levels	3.50%	3.60%
Other Benefits
Defined Benefit Plan Disclosure [Line Items]
Discount rate	2.50%	3.20%