RETIREMENT BENEFITS PLANS - Change in Plan Assets (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Change in plan assets
Beginning balance	$ 4,121
Ending balance	4,237	$ 4,121
Pension plans
Change in plan assets
Employer contributions	113	116	$ 343
Pension plans | United States
Change in plan assets
Beginning balance	2,635	3,672
Actual return on plan assets	203	(682)
Employer contributions	16	30	237
Gross benefits paid	(250)	(386)
Currency translation	0	0
Other	0	0
Ending balance	2,604	2,635	3,672
Pension plans | Non-United States plans
Change in plan assets
Beginning balance	1,486	2,247
Actual return on plan assets	86	(554)
Employer contributions	97	85	106
Gross benefits paid	(110)	(99)
Currency translation	71	(197)
Other	3	3
Ending balance	1,633	1,486	2,247
Other postretirement benefits plans
Change in plan assets
Beginning balance	16	19
Actual return on plan assets	1	(2)
Employer contributions	20	24
Gross benefits paid	(31)	(38)
Currency translation	0	0
Other	11	13
Ending balance	$ 17	$ 16	$ 19