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POSTRETIREMENT BENEFIT PLANS - Asset Allocation (Details)
Dec. 31, 2022
Principal pension plans | Global equities  
Defined Benefit Plan Disclosure [Line Items]  
Actual allocation 16.00%
Principal pension plans | Global equities | Minimum  
Defined Benefit Plan Disclosure [Line Items]  
Target allocation 14.00%
Principal pension plans | Global equities | Maximum  
Defined Benefit Plan Disclosure [Line Items]  
Target allocation 34.00%
Principal pension plans | Debt securities (including cash equivalents)  
Defined Benefit Plan Disclosure [Line Items]  
Actual allocation 55.00%
Principal pension plans | Debt securities (including cash equivalents) | Minimum  
Defined Benefit Plan Disclosure [Line Items]  
Target allocation 31.00%
Principal pension plans | Debt securities (including cash equivalents) | Maximum  
Defined Benefit Plan Disclosure [Line Items]  
Target allocation 81.50%
Principal pension plans | Real estate  
Defined Benefit Plan Disclosure [Line Items]  
Actual allocation 7.00%
Principal pension plans | Real estate | Minimum  
Defined Benefit Plan Disclosure [Line Items]  
Target allocation 1.00%
Principal pension plans | Real estate | Maximum  
Defined Benefit Plan Disclosure [Line Items]  
Target allocation 10.00%
Principal pension plans | Private equities and other investments  
Defined Benefit Plan Disclosure [Line Items]  
Actual allocation 22.00%
Principal pension plans | Private equities and other investments | Minimum  
Defined Benefit Plan Disclosure [Line Items]  
Target allocation 6.00%
Principal pension plans | Private equities and other investments | Maximum  
Defined Benefit Plan Disclosure [Line Items]  
Target allocation 30.00%
Other pension plans | Global equities  
Defined Benefit Plan Disclosure [Line Items]  
Target allocation 17.00%
Actual allocation 14.00%
Other pension plans | Debt securities (including cash equivalents)  
Defined Benefit Plan Disclosure [Line Items]  
Target allocation 60.00%
Actual allocation 57.00%
Other pension plans | Real estate  
Defined Benefit Plan Disclosure [Line Items]  
Target allocation 8.00%
Actual allocation 14.00%
Other pension plans | Private equities and other investments  
Defined Benefit Plan Disclosure [Line Items]  
Target allocation 15.00%
Actual allocation 15.00%