PENSION AND POSTRETIREMENT EMPLOYEE BENEFIT PLANS - Components of net periodic benefit cost (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
U.S. Postretirement Benefit Plan
Defined Benefit Plan Disclosure [Line Items]
Service cost	$ 0	$ 0	$ 0
Interest cost	1	2	2
Expected return on plan assets	0	0	0
Amortization of net loss	0	0	0
Amortization of prior service credit	(2)	(3)	(3)
Other	0	0	0
Net periodic (benefit) cost	(1)	(1)	(1)
U.S. Plan | Pension Benefit Plans
Defined Benefit Plan Disclosure [Line Items]
Service cost	2	2	2
Interest cost	7	8	8
Expected return on plan assets	(15)	(13)	(13)
Amortization of net loss	0	0	0
Amortization of prior service credit	0	0	0
Other	0	0	0
Net periodic (benefit) cost	(6)	(3)	(3)
Non-U.S. Plans | Pension Benefit Plans
Defined Benefit Plan Disclosure [Line Items]
Service cost	3	3	3
Interest cost	5	5	6
Expected return on plan assets	(5)	(5)	(7)
Amortization of net loss	1	2	0
Amortization of prior service credit	(1)	(1)	(1)
Other	0	0	2
Net periodic (benefit) cost	$ 3	$ 4	$ 3