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EMPLOYEE BENEFITS - ASSUMPTIONS (Details)
12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Pension Benefits | Benefit obligation assumptions        
Weighted average assumptions - benefit obligations        
Discount rate   3.00% 2.74% 3.45%
Rate of compensation increase   4.00% 4.00%  
Interest credit rate   2.25% 2.25%  
Pension Benefits | Net periodic benefit cost assumptions        
Weighted average assumptions - net periodic benefit cost        
Discount rate   2.74% 3.45% 4.30%
Expected return on plan assets   7.00% 7.00% 7.25%
Rate of compensation increase   4.00% 4.00% 4.00%
Interest credit rate   2.25% 2.25% 2.25%
Pension Benefits | Net periodic benefit cost assumptions | Subsequent event        
Weighted average assumptions - net periodic benefit cost        
Expected return on plan assets 7.00%      
OPEB Benefits | Benefit obligation assumptions        
Weighted average assumptions - benefit obligations        
Discount rate   2.98% 2.72%  
OPEB Benefits | Benefit obligation assumptions | Pre 65        
Medical cost trend rates        
Assumed medical cost trend rate   5.70% 5.85%  
Ultimate trend rate   5.00% 5.00%  
Year ultimate trend rate is reached   2028 2028  
OPEB Benefits | Benefit obligation assumptions | Post 65        
Medical cost trend rates        
Assumed medical cost trend rate   5.60% 5.70%  
Ultimate trend rate   5.00% 5.00%  
Year ultimate trend rate is reached   2028 2028  
OPEB Benefits | Net periodic benefit cost assumptions        
Weighted average assumptions - net periodic benefit cost        
Discount rate   2.95% 3.48% 4.29%
Expected return on plan assets   7.00% 7.00% 7.25%
OPEB Benefits | Net periodic benefit cost assumptions | Subsequent event        
Weighted average assumptions - net periodic benefit cost        
Expected return on plan assets 7.00%      
OPEB Benefits | Net periodic benefit cost assumptions | Pre 65        
Medical cost trend rates        
Assumed medical cost trend rate   5.85% 6.00% 6.25%
Ultimate trend rate   5.00% 5.00% 5.00%
Year ultimate trend rate is reached   2028 2028 2024
OPEB Benefits | Net periodic benefit cost assumptions | Post 65        
Medical cost trend rates        
Assumed medical cost trend rate   5.70% 5.80% 5.90%
Ultimate trend rate   5.00% 5.00% 5.00%
Year ultimate trend rate is reached   2028 2028 2028