RETIREMENT BENEFITS - Net (Benefit) Expense (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2023	Mar. 31, 2022
U.S. Plans | Pension Plans
Service-related expense
Service cost	$ 0	$ 0
Interest cost on benefit obligation	127	86
Expected return on plan assets	(161)	(154)
Amortization of unrecognized:
Prior service cost (benefit)	1	1
Net actuarial loss (gain)	38	56
Curtailment (gain)	0	0
Settlement loss	0	0
Total net expense	5	(11)
U.S. Plans | Postretirement Benefit Plans
Service-related expense
Service cost	0	0
Interest cost on benefit obligation	5	3
Expected return on plan assets	(3)	(3)
Amortization of unrecognized:
Prior service cost (benefit)	(2)	(2)
Net actuarial loss (gain)	(3)	(1)
Curtailment (gain)	0	0
Settlement loss	0	0
Total net expense	(3)	(3)
Non-U.S. plans | Pension Plans
Service-related expense
Service cost	28	34
Interest cost on benefit obligation	98	73
Expected return on plan assets	(81)	(66)
Amortization of unrecognized:
Prior service cost (benefit)	(2)	(2)
Net actuarial loss (gain)	18	13
Curtailment (gain)	(8)	0
Settlement loss	3	0
Total net expense	56	52
Non-U.S. plans | Postretirement Benefit Plans
Service-related expense
Service cost	0	1
Interest cost on benefit obligation	25	23
Expected return on plan assets	(19)	(20)
Amortization of unrecognized:
Prior service cost (benefit)	(2)	(3)
Net actuarial loss (gain)	(4)	1
Curtailment (gain)	0	0
Settlement loss	0	0
Total net expense	$ 0	$ 2