RETIREMENT BENEFITS - Net (Benefit) Expense (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2022	Jun. 30, 2021	Jun. 30, 2022	Jun. 30, 2021
U.S. | Pension Plans
Service-related expense
Benefits earned during the period	$ 0	$ 0	$ 0	$ 0
Interest cost on benefit obligation	105	95	191	177
Expected return on plan assets	(154)	(174)	(308)	(356)
Amortization of unrecognized:
Prior service cost (benefit)	0	0	1	1
Net actuarial loss (gain)	44	54	100	116
Curtailment (gain)	0	0	0	0
Settlement (gain) loss	0	0	0	0
Total net expense	(5)	(25)	(16)	(62)
U.S. | Postretirement Benefit Plans
Service-related expense
Benefits earned during the period	0	0	0	0
Interest cost on benefit obligation	4	3	7	6
Expected return on plan assets	(3)	(3)	(6)	(7)
Amortization of unrecognized:
Prior service cost (benefit)	(3)	(2)	(5)	(4)
Net actuarial loss (gain)	(2)	(1)	(3)	(1)
Curtailment (gain)	0	0	0	0
Settlement (gain) loss	0	0	0	0
Total net expense	(4)	(3)	(7)	(6)
Non-U.S. plans | Pension Plans
Service-related expense
Benefits earned during the period	30	38	64	77
Interest cost on benefit obligation	79	70	152	132
Expected return on plan assets	(66)	(63)	(132)	(124)
Amortization of unrecognized:
Prior service cost (benefit)	(1)	(2)	(3)	(3)
Net actuarial loss (gain)	14	14	27	32
Curtailment (gain)	(23)	0	(23)	0
Settlement (gain) loss	(10)	4	(10)	4
Total net expense	23	61	75	118
Non-U.S. plans | Pension Plans | Consumer
Amortization of unrecognized:
Total net expense	28		28
Non-U.S. plans | Postretirement Benefit Plans
Service-related expense
Benefits earned during the period	0	2	1	4
Interest cost on benefit obligation	23	24	46	49
Expected return on plan assets	(18)	(21)	(38)	(43)
Amortization of unrecognized:
Prior service cost (benefit)	(1)	(3)	(4)	(5)
Net actuarial loss (gain)	1	3	2	8
Curtailment (gain)	0	0	0	0
Settlement (gain) loss	0	0	0	0
Total net expense	$ 5	$ 5	$ 7	$ 13