Annual report [Section 13 and 15(d), not S-K Item 405]

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, 2024
Dec. 31, 2023
Pension Benefits    
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]    
2025 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]    
2025 Target Allocation 34.00%  
Percentage of Plan Assets 32.70% 32.10%
Pension Benefits | Fixed income    
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]    
2025 Target Allocation 40.80%  
Percentage of Plan Assets 38.90% 38.80%
Pension Benefits | Hedge funds    
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]    
2025 Target Allocation 9.40%  
Percentage of Plan Assets 9.60% 9.40%
Pension Benefits | Private equity    
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]    
2025 Target Allocation 3.40%  
Percentage of Plan Assets 3.60% 3.40%
Pension Benefits | Structured credit    
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]    
2025 Target Allocation 2.50%  
Percentage of Plan Assets 4.00% 5.10%
Pension Benefits | Real estate    
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]    
2025 Target Allocation 9.90%  
Percentage of Plan Assets 11.20% 11.20%
OPEB    
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]    
2025 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]    
2025 Target Allocation 17.20%  
Percentage of Plan Assets 17.60% 18.40%
OPEB | Fixed income    
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]    
2025 Target Allocation 78.40%  
Percentage of Plan Assets 76.60% 74.50%
OPEB | Hedge funds    
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]    
2025 Target Allocation 1.00%  
Percentage of Plan Assets 1.20% 1.50%
OPEB | Private equity    
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]    
2025 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]    
2025 Target Allocation 0.30%  
Percentage of Plan Assets 0.50% 0.90%
OPEB | Real estate    
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]    
2025 Target Allocation 3.10%  
Percentage of Plan Assets 4.10% 4.70%