RETIREMENT BENEFITS - Net (Benefit) Expense (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2024	Mar. 31, 2023
U.S. plans | Pension plans
Service-related expense
Service cost	$ 0	$ 0
Interest cost on benefit obligation	117	127
Expected return on plan assets	(151)	(161)
Amortization of unrecognized:
Prior service cost (benefit)	0	1
Net actuarial loss (gain)	46	38
Curtailment (gain)	0	0
Settlement loss	0	0
Total net expense	12	5
U.S. plans | Postretirement benefit plans
Service-related expense
Service cost	0	0
Interest cost on benefit obligation	4	5
Expected return on plan assets	(3)	(3)
Amortization of unrecognized:
Prior service cost (benefit)	(2)	(2)
Net actuarial loss (gain)	(2)	(3)
Curtailment (gain)	0	0
Settlement loss	0	0
Total net expense	(3)	(3)
Non-U.S. plans | Pension plans
Service-related expense
Service cost	29	28
Interest cost on benefit obligation	109	98
Expected return on plan assets	(87)	(81)
Amortization of unrecognized:
Prior service cost (benefit)	(1)	(2)
Net actuarial loss (gain)	23	18
Curtailment (gain)	0	(8)
Settlement loss	0	3
Total net expense	73	56
Non-U.S. plans | Postretirement benefit plans
Service-related expense
Service cost	0	0
Interest cost on benefit obligation	29	25
Expected return on plan assets	(22)	(19)
Amortization of unrecognized:
Prior service cost (benefit)	(2)	(2)
Net actuarial loss (gain)	3	(4)
Curtailment (gain)	0	0
Settlement loss	0	0
Total net expense	$ 8	$ 0