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PENSION AND OTHER POSTRETIREMENT BENEFIT PROGRAMS - Changes in Fair Value Measurements that Used Significant Unobservable Inputs (Details) - Other holdings - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Defined Benefit Plan, Change in Fair Value of Plan Assets, Level 3 Reconciliation [Roll Forward]    
Beginning of period $ 85  
End of period 264 $ 85
Significant unobservable inputs (Level 3)    
Defined Benefit Plan, Change in Fair Value of Plan Assets, Level 3 Reconciliation [Roll Forward]    
Beginning of period 8 9
Transfers out   (1)
Purchases 149  
End of period 157 $ 8
Significant unobservable inputs (Level 3) | United Kingdom    
Defined Benefit Plan, Change in Fair Value of Plan Assets, Level 3 Reconciliation [Roll Forward]    
Purchases $ 148