Annual report pursuant to Section 13 and 15(d)

PENSIONS AND OTHER POSTRETIREMENT BENEFITS - Target Allocation and Actual Asset Allocations for Pension and VEBA Plan Assets (Details)

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PENSIONS AND OTHER POSTRETIREMENT BENEFITS - Target Allocation and Actual Asset Allocations for Pension and VEBA Plan Assets (Details)
Dec. 31, 2023
Dec. 31, 2022
Pension Benefits    
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]    
2024 Target Allocation 100.00%  
Percentage of Plan Assets 100.00% 100.00%
Pension Benefits | Equity securities    
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]    
2024 Target Allocation 33.80%  
Percentage of Plan Assets 32.10% 36.10%
Pension Benefits | Fixed income    
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]    
2024 Target Allocation 41.10%  
Percentage of Plan Assets 38.80% 40.90%
Pension Benefits | Hedge funds    
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]    
2024 Target Allocation 9.40%  
Percentage of Plan Assets 9.40% 2.70%
Pension Benefits | Private equity    
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]    
2024 Target Allocation 3.30%  
Percentage of Plan Assets 3.40% 3.30%
Pension Benefits | Structured credit    
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]    
2024 Target Allocation 2.40%  
Percentage of Plan Assets 5.10% 6.90%
Pension Benefits | Real estate    
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]    
2024 Target Allocation 10.00%  
Percentage of Plan Assets 11.20% 8.20%
Pension Benefits | Absolute return fixed income    
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]    
2024 Target Allocation 0.00%  
Percentage of Plan Assets 0.00% 1.90%
OPEB    
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]    
2024 Target Allocation 100.00%  
Percentage of Plan Assets 100.00% 100.00%
OPEB | Equity securities    
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]    
2024 Target Allocation 16.60%  
Percentage of Plan Assets 18.40% 22.00%
OPEB | Fixed income    
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]    
2024 Target Allocation 78.50%  
Percentage of Plan Assets 74.50% 67.40%
OPEB | Hedge funds    
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]    
2024 Target Allocation 1.40%  
Percentage of Plan Assets 1.50% 1.90%
OPEB | Private equity    
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]    
2024 Target Allocation 0.00%  
Percentage of Plan Assets 0.00% 0.00%
OPEB | Structured credit    
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]    
2024 Target Allocation 0.20%  
Percentage of Plan Assets 0.90% 1.20%
OPEB | Real estate    
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]    
2024 Target Allocation 3.30%  
Percentage of Plan Assets 4.70% 1.70%
OPEB | Absolute return fixed income    
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]    
2024 Target Allocation 0.00%  
Percentage of Plan Assets 0.00% 5.80%