RETIREMENT BENEFITS - Net (Benefit) Expense (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022
U.S. plans | Pension plans
Service-related expense
Service cost	$ 0	$ 0	$ 0	$ 0
Interest cost on benefit obligation	124	120	374	311
Expected return on plan assets	(160)	(153)	(481)	(461)
Amortization of unrecognized:
Prior service (benefit)	0	0	1	1
Net actuarial loss (gain)	39	36	118	136
Curtailment (gain)			0	0
Settlement loss	0	0	0	0
Total net expense	3	3	12	(13)
U.S. plans | Postretirement benefit plans
Service-related expense
Service cost	0	0	0	0
Interest cost on benefit obligation	4	4	13	11
Expected return on plan assets	(3)	(3)	(10)	(9)
Amortization of unrecognized:
Prior service (benefit)	(2)	(2)	(7)	(7)
Net actuarial loss (gain)	(3)	(2)	(8)	(5)
Curtailment (gain)			0	0
Settlement loss	0	0	0	0
Total net expense	(4)	(3)	(12)	(10)
Non-U.S. plans | Pension plans
Service-related expense
Service cost	29	26	87	90
Interest cost on benefit obligation	105	91	305	243
Expected return on plan assets	(84)	(64)	(247)	(196)
Amortization of unrecognized:
Prior service (benefit)	(1)	(2)	(4)	(5)
Net actuarial loss (gain)	20	16	54	43
Curtailment (gain)			(8)	(23)
Settlement loss	5	0	9	(10)
Total net expense	74	67	196	142
Non-U.S. plans | Pension plans | Consumer loans
Amortization of unrecognized:
Total net expense				36
Non-U.S. plans | Postretirement benefit plans
Service-related expense
Service cost	0	1	1	2
Interest cost on benefit obligation	27	21	79	67
Expected return on plan assets	(20)	(16)	(59)	(54)
Amortization of unrecognized:
Prior service (benefit)	(2)	(2)	(6)	(6)
Net actuarial loss (gain)	(4)	2	(14)	4
Curtailment (gain)			0	0
Settlement loss	0	0	0	0
Total net expense	$ 1	$ 6	$ 1	$ 13