RESTRUCTURING - Schedule of Restructuring Reserve Activity (Details) - USD ($) $ in Millions	3 Months Ended				9 Months Ended		12 Months Ended
	Sep. 30, 2024	Jun. 30, 2024	Mar. 31, 2024	Sep. 30, 2023	Sep. 30, 2024	Sep. 30, 2023	Dec. 31, 2023
Restructuring Reserve [Roll Forward]
Beginning of period	$ 272	$ 764	$ 712		$ 712	$ 0	$ 0
Restructuring charges	34	81	291
Change in estimate	(25)	(45)	(66)
Net restructuring charges	9	36	225	$ 0	270	0	781
Payments and utilization	(169)	(527)	(173)				(69)
Foreign exchange	(10)	(1)	0				0
End of period	102	272	764		102		712
Personnel costs
Restructuring Reserve [Roll Forward]
Beginning of period	272	731	687		687	0	0
Restructuring charges	34	81	237
Change in estimate	(25)	(42)	(66)
Net restructuring charges	9	39	171				687
Payments and utilization	(169)	(497)	(127)				0
Foreign exchange	(10)	(1)	0				0
End of period	102	272	731		102		687
Other
Restructuring Reserve [Roll Forward]
Beginning of period	0	33	25		25	$ 0	0
Restructuring charges	0	0	54
Change in estimate	0	(3)	0
Net restructuring charges	0	(3)	54				94
Payments and utilization	0	(30)	(46)				(69)
Foreign exchange	0	0	0				0
End of period	$ 0	$ 0	$ 33		$ 0		$ 25