RESTRUCTURING - Schedule of Restructuring Reserve Activity (Details) - USD ($) $ in Millions	3 Months Ended				6 Months Ended		12 Months Ended
	Jun. 30, 2024	Mar. 31, 2024	Dec. 31, 2023	Jun. 30, 2023	Jun. 30, 2024	Jun. 30, 2023	Dec. 31, 2023
Restructuring Reserve [Roll Forward]
Beginning of period	$ 764	$ 712			$ 712	$ 0	$ 0
Restructuring charges	81	291
Change in estimate	(45)	(66)
Net restructuring charges	36	225	$ 781	$ 0	261	0	781
Payments and utilization	(527)	(173)					(69)
Foreign exchange	(1)	0					0
End of period	272	764	712		272		712
Personnel costs
Restructuring Reserve [Roll Forward]
Beginning of period	731	687			687	0	0
Restructuring charges	81	237
Change in estimate	(42)	(66)
Net restructuring charges	39	171					687
Payments and utilization	(497)	(127)					0
Foreign exchange	(1)	0					0
End of period	272	731	687		272		687
Other
Restructuring Reserve [Roll Forward]
Beginning of period	33	25			25	$ 0	0
Restructuring charges	0	54
Change in estimate	(3)	0
Net restructuring charges	(3)	54					94
Payments and utilization	(30)	(46)					(69)
Foreign exchange	0	0					0
End of period	$ 0	$ 33	$ 25		$ 0		$ 25