Annual report pursuant to Section 13 and 15(d)

BENEFIT PLANS - Weighted-Average Assumptions used to Determine Net Periodic Benefit Cost (Details)

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BENEFIT PLANS - Weighted-Average Assumptions used to Determine Net Periodic Benefit Cost (Details)
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Pension Benefits      
Weighted-average assumptions used to determine net periodic benefit cost at December 31,      
Discount rate 4.39% 3.73% 4.23%
Expected return on plan assets 6.46% 7.14% 7.14%
Rate of compensation increase 4.93% 4.88% 4.88%
Other Benefits      
Weighted-average assumptions used to determine net periodic benefit cost at December 31,      
Discount rate 4.30% 3.60% 3.98%
Expected return on plan assets 6.70% 7.25% 7.25%