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EMPLOYEE BENEFITS - Schedule of Assumptions used To Calculate Pension and SERP and PBOP (Details)
12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Defined Benefit Plan Disclosure [Line Items]      
Expected Long-Term Rate of Return (in percent) 7.00% 7.00%  
Pension and SERP      
Defined Benefit Plan Disclosure [Line Items]      
Expected Long-Term Rate of Return (in percent) 8.25% 8.25% 8.25%
PBOP      
Defined Benefit Plan Disclosure [Line Items]      
Expected Long-Term Rate of Return (in percent) 8.25% 8.25% 8.25%
Minimum | Pension and SERP      
Defined Benefit Plan Disclosure [Line Items]      
Discount rate (in percent) 2.20% 1.50% 2.60%
Compensation/Progression Rate (in percent) 3.50% 3.50% 3.50%
Minimum | PBOP      
Defined Benefit Plan Disclosure [Line Items]      
Discount rate (in percent) 2.30% 1.80% 2.70%
Maximum | Pension and SERP      
Defined Benefit Plan Disclosure [Line Items]      
Discount rate (in percent) 3.20% 3.00% 3.50%
Compensation/Progression Rate (in percent) 4.00% 4.00% 4.00%
Maximum | PBOP      
Defined Benefit Plan Disclosure [Line Items]      
Discount rate (in percent) 3.30% 3.10% 3.60%