SEGMENT INFORMATION - Revenue by Geographic Area (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenues	$ 2,138	$ 2,209	$ 5,814	$ 6,377
U.S. and Puerto Rico
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenues	1,301	1,369	3,522	3,851
China
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenues	94	85	231	275
Canada
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenues	87	85	244	252
Mexico
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenues	68	58	157	164
Egypt
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenues	59	55	175	157
Poland
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenues	57	53	168	168
Japan
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenues	57	67	159	181
France
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenues	42	45	131	156
Germany
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenues	32	33	108	119
Russia
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenues	32	47	89	124
Spain
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenues	21	18	53	62
United Kingdom
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenues	21	28	58	86
Other
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenues	$ 267	$ 266	$ 719	$ 782