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EMPLOYEE BENEFIT PLANS - Discount rate and assumptions (Details)
 12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Supplemental Benefit Plan      
Weighted-average assumptions used to determine nonunion benefit obligations      
Discount rate (as a percent) 4.60% 1.80%  
Weighted-average assumptions used to determine net periodic benefit cost      
Discount rate (as a percent) 1.80% 1.10% 2.40%
Postretirement Health Benefit Plan      
Weighted-average assumptions used to determine nonunion benefit obligations      
Discount rate (as a percent) 5.00% 2.70%  
Weighted-average assumptions used to determine net periodic benefit cost      
Discount rate (as a percent) 2.70% 2.30% 3.10%