NATURE OF OPERATIONS AND SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Revenue Recognition, Narrative (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018	Dec. 31, 2018
Disaggregation of Revenue [Line Items]
Revenues	$ 1,125	$ 766	$ 2,618	$ 2,162
Deferred revenue	61		61		$ 83
Deferred revenue, revenue recognized			65	29
Distribution revenue
Disaggregation of Revenue [Line Items]
Revenues	$ 679	$ 331	1,398	$ 965
One Customer | Distribution revenue
Disaggregation of Revenue [Line Items]
Revenues			$ 297