RESTRUCTURING CHARGES - Restructuring Roll Forward (Details) - USD ($) $ in Millions	6 Months Ended	12 Months Ended
	Jun. 30, 2018	Dec. 31, 2017
Restructuring Reserve [Roll Forward]
Beginning balance	$ 72	$ 114
Liability recognized		116
Payments	(29)	(141)
Other adjustments	(10)	(17)
Ending balance	33	72
Workforce reductions [Member]
Restructuring Reserve [Roll Forward]
Beginning balance	67	113
Liability recognized		57
Payments	(25)	(102)
Other adjustments	(10)	(1)
Ending balance	32	67
Plant closings and other [Member]
Restructuring Reserve [Roll Forward]
Beginning balance	5	1
Liability recognized		59
Payments	(4)	(39)
Other adjustments	0	(16)
Ending balance	$ 1	$ 5