SEGMENT INFORMATION - Revenue by Geographic Area (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenues	$ 2,136	$ 2,219	$ 6,259	$ 6,561
U.S. and Puerto Rico
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenues	1,329	1,306	3,766	3,945
China
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenues	91	90	273	240
Canada
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenues	78	83	231	238
Japan
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenues	59	58	165	166
Poland
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenues	49	51	164	147
France
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenues	46	41	159	142
Mexico
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenues	56	54	153	144
Egypt
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenues	45	41	134	116
Germany
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenues	38	39	130	119
Russia
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenues	38	57	106	148
United Kingdom
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenues	29	29	87	79
Italy
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenues	19	19	64	58
Spain
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenues	17	17	61	55
Other
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenues	$ 242	$ 334	$ 766	$ 964