SEGMENT INFORMATION - Revenue by Geographic Area (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenues	$ 2,209	$ 2,136	$ 6,377	$ 6,259
U.S. and Puerto Rico
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenues	1,369	1,329	3,851	3,766
China
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenues	86	91	276	273
Canada
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenues	85	78	252	231
Japan
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenues	67	59	181	165
Mexico
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenues	56	56	158	153
Egypt
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenues	55	45	157	134
France
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenues	45	46	156	159
Poland
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenues	49	49	156	164
Russia
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenues	47	38	124	106
Germany
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenues	33	38	119	130
United Kingdom
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenues	27	29	85	87
Italy
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenues	18	19	62	64
Spain
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenues	18	17	62	61
Other
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenues	$ 254	$ 242	$ 738	$ 766