RETIREMENT BENEFITS PLANS - Change in Benefit Obligations (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Pension plans | United States
Change in benefit obligations
Balance at January 1	$ 2,807	$ 3,760
Service cost	19	27	$ 37
Interest cost	142	117	70
Actuarial loss (gain)	104	(713)
Gross benefits paid	(250)	(386)
Currency translation	0	0
Plan amendments	1	1
Other	0	0
Balance at December 31	2,824	2,807	3,760
Accumulated benefit obligation	2,807	2,784
Pension plans | Non-United States plans
Change in benefit obligations
Balance at January 1	1,813	2,837
Service cost	43	59	72
Interest cost	85	47	40
Actuarial loss (gain)	104	(817)
Gross benefits paid	(110)	(99)
Currency translation	85	(218)
Plan amendments	(1)	1
Other	3	3
Balance at December 31	2,022	1,813	2,837
Accumulated benefit obligation	1,922	1,737
Other postretirement benefits plans
Change in benefit obligations
Balance at January 1	209	304
Service cost	1	1	1
Interest cost	10	7	6
Actuarial loss (gain)	11	(73)
Gross benefits paid	(31)	(38)
Currency translation	1	(3)
Plan amendments	0	(2)
Other	11	13
Balance at December 31	$ 212	$ 209	$ 304