GEOGRAPHIC AREAS - Sales by Geographic Area (Details) - USD ($) $ in Millions	3 Months Ended								12 Months Ended
	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Revenues from External Customers and Long-Lived Assets [Line Items]
Net sales	$ 1,636	$ 1,910	$ 2,065	$ 1,865	$ 1,823	$ 1,872	$ 1,808	$ 1,693	$ 7,476	$ 7,196	$ 6,365
U.S.
Revenues from External Customers and Long-Lived Assets [Line Items]
Net sales									6,365	6,168	5,451
Japan
Revenues from External Customers and Long-Lived Assets [Line Items]
Net sales									410	352	369
China
Revenues from External Customers and Long-Lived Assets [Line Items]
Net sales									120	107	108
Canada
Revenues from External Customers and Long-Lived Assets [Line Items]
Net sales									519	472	341
Other foreign countries
Revenues from External Customers and Long-Lived Assets [Line Items]
Net sales									62	97	96
Export sales from the U.S.
Revenues from External Customers and Long-Lived Assets [Line Items]
Net sales									604	545	515
Export sales from the U.S. | Japan
Revenues from External Customers and Long-Lived Assets [Line Items]
Net sales									338	295	314
Export sales from the U.S. | China
Revenues from External Customers and Long-Lived Assets [Line Items]
Net sales									113	102	103
Export sales from the U.S. | Other foreign countries
Revenues from External Customers and Long-Lived Assets [Line Items]
Net sales									$ 153	$ 148	$ 98