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BENEFIT PLANS - WEIGHTED AVERAGE ASSUMPTIONS USED TO DETERMINE BENEFIT OBLIGATIONS (Details)
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Retirement Benefits [Abstract]      
Interest crediting rate 1.30% 1.30% 1.50%
Discount rate 0.60% 1.00% 1.80%
Rate of compensation increase 2.40% 2.50% 2.50%