PENSION AND OTHER POSTRETIREMENT BENEFIT PROGRAMS - Changes in Fair Value Measurements that Used Significant Unobservable Inputs (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023
Defined Benefit Plan, Change in Fair Value of Plan Assets, Level 3 Reconciliation [Roll Forward]
Beginning of period	$ 2,350
End of period	2,228	$ 2,350
Significant unobservable inputs (Level 3)
Defined Benefit Plan, Change in Fair Value of Plan Assets, Level 3 Reconciliation [Roll Forward]
Beginning of period	155
End of period	127	155
Other holdings
Defined Benefit Plan, Change in Fair Value of Plan Assets, Level 3 Reconciliation [Roll Forward]
Beginning of period	239
End of period	215	239
Other holdings | Significant unobservable inputs (Level 3)
Defined Benefit Plan, Change in Fair Value of Plan Assets, Level 3 Reconciliation [Roll Forward]
Beginning of period	155	7
Purchases	3	148
Unrealized gains (losses)	(24)
Sales	(7)
End of period	127	$ 155
Other holdings | Significant unobservable inputs (Level 3) | United Kingdom
Defined Benefit Plan, Change in Fair Value of Plan Assets, Level 3 Reconciliation [Roll Forward]
Purchases	$ 148