GEOGRAPHIC AREAS - Sales by Geographic Area (Details) - USD ($) $ in Millions	3 Months Ended								12 Months Ended
	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Revenues from External Customers and Long-Lived Assets [Line Items]
Net sales	$ 1,548	$ 1,671	$ 1,692	$ 1,643	$ 1,636	$ 1,910	$ 2,065	$ 1,865	$ 6,554	$ 7,476	$ 7,196
U.S.
Revenues from External Customers and Long-Lived Assets [Line Items]
Net sales									5,674	6,365	6,168
Canada
Revenues from External Customers and Long-Lived Assets [Line Items]
Net sales									440	519	472
Japan
Revenues from External Customers and Long-Lived Assets [Line Items]
Net sales									305	410	352
China
Revenues from External Customers and Long-Lived Assets [Line Items]
Net sales									90	120	107
Other foreign countries
Revenues from External Customers and Long-Lived Assets [Line Items]
Net sales									45	62	97
Export sales from the U.S.
Revenues from External Customers and Long-Lived Assets [Line Items]
Net sales									479	604	545
Export sales from the U.S. | U.S. | Japanese Customers
Revenues from External Customers and Long-Lived Assets [Line Items]
Net sales									265	338	295
Export sales from the U.S. | U.S. | Chinese Customers
Revenues from External Customers and Long-Lived Assets [Line Items]
Net sales									85	113	102
Export sales from the U.S. | U.S. | Other Countries Customers
Revenues from External Customers and Long-Lived Assets [Line Items]
Net sales									$ 129	$ 153	$ 148