v3.20.4
EMPLOYEE BENEFIT PLANS Table 7 - Assumptions - Benefit Obligations (Details)
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Pension Plan [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Discount rate 2.84% 3.34% 4.40%
Rate of compensation increase 3.51% 3.51%  
Cash balance interest crediting rate 2.00% 2.00%  
Other Postretirement Benefit Plans [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Discount rate 2.83% 3.43%