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, 2022
Dec. 31, 2021
Pension Benefits    
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]    
2023 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]    
2023 Target Allocation 33.30%  
Percentage of Plan Assets 36.10% 47.60%
Pension Benefits | Fixed income    
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]    
2023 Target Allocation 41.60%  
Percentage of Plan Assets 40.90% 34.60%
Pension Benefits | Hedge funds    
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]    
2023 Target Allocation 9.20%  
Percentage of Plan Assets 2.70% 2.20%
Pension Benefits | Private equity    
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]    
2023 Target Allocation 3.30%  
Percentage of Plan Assets 3.30% 2.70%
Pension Benefits | Structured credit    
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]    
2023 Target Allocation 2.60%  
Percentage of Plan Assets 6.90% 5.60%
Pension Benefits | Real estate    
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]    
2023 Target Allocation 10.00%  
Percentage of Plan Assets 8.20% 5.60%
Pension Benefits | Absolute return fixed income    
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]    
2023 Target Allocation 0.00%  
Percentage of Plan Assets 1.90% 1.70%
OPEB    
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]    
2023 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]    
2023 Target Allocation 21.90%  
Percentage of Plan Assets 22.00% 22.50%
OPEB | Fixed income    
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]    
2023 Target Allocation 73.70%  
Percentage of Plan Assets 67.40% 66.40%
OPEB | Hedge funds    
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]    
2023 Target Allocation 2.20%  
Percentage of Plan Assets 1.90% 1.80%
OPEB | Private equity    
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]    
2023 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]    
2023 Target Allocation 1.10%  
Percentage of Plan Assets 1.20% 1.20%
OPEB | Real estate    
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]    
2023 Target Allocation 1.10%  
Percentage of Plan Assets 1.70% 2.10%
OPEB | Absolute return fixed income    
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]    
2023 Target Allocation 0.00%  
Percentage of Plan Assets 5.80% 6.00%