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PENSION AND OTHER POSTEMPLOYMENT BENEFITS - Assumptions Used to Determine Net Periodic Benefit Cost (Details)
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Pension      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Discount rate 5.72% 5.05% 5.23%
Rate of compensation increase 4.30% 4.30% 4.30%
Cash balance weighted average interest crediting rate 4.37% 4.94% 4.04%
Effective rate for interest on benefit obligations 4.92%   2.44%
Effective rate for service costs 5.17%   3.28%
Effective rate for interest on service costs 5.05%   2.96%
Expected return on plan assets 8.00% 8.00% 7.50%
Rate of compensation increase 4.30% 4.30% 4.10%
Pension | Minimum      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Effective rate for interest on benefit obligations   5.10%  
Effective rate for service costs   5.34%  
Effective rate for interest on service costs   5.22%  
Pension | Maximum      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Effective rate for interest on benefit obligations   4.80%  
Effective rate for service costs   5.11%  
Effective rate for interest on service costs   4.94%  
OPEB      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Discount rate 5.60% 4.97% 5.16%
Effective rate for interest on benefit obligations 4.88% 5.06%  
Effective rate for service costs 5.23% 5.41%  
Effective rate for interest on service costs 5.16% 5.33%  
Expected return on plan assets 7.00% 7.00% 7.50%
Rate to which the cost trend rate is assumed to decline (ultimate trend rate) 4.50% 4.50% 4.50%
OPEB | Minimum      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Effective rate for interest on benefit obligations     2.18%
Effective rate for service costs     3.41%
Effective rate for interest on service costs     3.24%
Other Postretirement Benefits Plan - Pre Medicare      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Health care cost trend rate assumed (pre/post-Medicare) 7.00% 7.00% 6.00%
Other Postretirement Benefits Plan - Post Medicare      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Health care cost trend rate assumed (pre/post-Medicare) 6.00% 6.50% 5.50%