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EMPLOYEE BENEFIT PLANS (Schedule of Assumptions Used in Calculating Projected Benefit Cost and Net Periodic Benefit Cost) (Details)
12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Defined Benefit Plan Disclosure [Line Items]      
Expected return on plan assets 9.60%    
Pension Plan      
Defined Benefit Plan Disclosure [Line Items]      
Discount rate 3.03% 2.77% 3.46%
Rate of future compensation increases 3.80% 3.80% 3.90%
Expected return on plan assets 5.50% 5.10% 5.70%
Interest crediting rate for cash balance plan 1.95% 1.95% 2.11%
PBOP Plans | Minimum      
Defined Benefit Plan Disclosure [Line Items]      
Discount rate 2.97% 2.67% 3.37%
Expected return on plan assets 3.30% 3.10% 3.50%
PBOP Plans | Maximum      
Defined Benefit Plan Disclosure [Line Items]      
Discount rate 3.04% 2.80% 3.47%
Expected return on plan assets 6.40% 6.10% 6.60%