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, 2021
Dec. 31, 2020
Pension Plan    
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]    
2022 Target Allocation 100.00%  
Percentage of Plan Assets 100.00% 100.00%
Pension Plan | Equity securities    
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]    
2022 Target Allocation 46.30%  
Percentage of Plan Assets 47.60% 51.80%
Pension Plan | Fixed income    
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]    
2022 Target Allocation 34.60%  
Percentage of Plan Assets 34.60% 33.80%
Pension Plan | Hedge funds    
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]    
2022 Target Allocation 2.20%  
Percentage of Plan Assets 2.20% 2.20%
Pension Plan | Private equity    
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]    
2022 Target Allocation 5.00%  
Percentage of Plan Assets 2.70% 2.10%
Pension Plan | Structured credit    
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]    
2022 Target Allocation 5.20%  
Percentage of Plan Assets 5.60% 5.00%
Pension Plan | Real estate    
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]    
2022 Target Allocation 5.20%  
Percentage of Plan Assets 5.60% 3.30%
Pension Plan | Absolute return fixed income    
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]    
2022 Target Allocation 1.50%  
Percentage of Plan Assets 1.70% 1.80%
Other Postretirement Benefits Plan    
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]    
2022 Target Allocation 100.00%  
Percentage of Plan Assets 100.00% 100.00%
Other Postretirement Benefits Plan | Equity securities    
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]    
2022 Target Allocation 21.20%  
Percentage of Plan Assets 22.50% 22.20%
Other Postretirement Benefits Plan | Fixed income    
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]    
2022 Target Allocation 68.50%  
Percentage of Plan Assets 66.40% 66.40%
Other Postretirement Benefits Plan | Hedge funds    
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]    
2022 Target Allocation 1.40%  
Percentage of Plan Assets 1.80% 1.80%
Other Postretirement Benefits Plan | Private equity    
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]    
2022 Target Allocation 1.10%  
Percentage of Plan Assets 0.00% 0.40%
Other Postretirement Benefits Plan | Structured credit    
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]    
2022 Target Allocation 1.00%  
Percentage of Plan Assets 1.20% 0.90%
Other Postretirement Benefits Plan | Real estate    
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]    
2022 Target Allocation 1.00%  
Percentage of Plan Assets 2.10% 1.80%
Other Postretirement Benefits Plan | Absolute return fixed income    
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]    
2022 Target Allocation 5.80%  
Percentage of Plan Assets 6.00% 6.50%