SEGMENT INFORMATION - Revenue by Geographic Area (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenues	$ 1,664	$ 2,152	$ 3,676	$ 4,168
U.S. and Puerto Rico
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenues	1,009	1,282	2,221	2,482
China
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenues	79	101	137	190
Canada
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenues	67	88	157	167
Egypt
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenues	58	49	116	102
Japan
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenues	48	59	102	114
Mexico
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenues	48	60	89	106
France
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenues	42	58	89	111
Poland
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenues	37	53	111	115
Germany
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenues	32	41	76	86
Russia
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenues	24	41	57	77
South Korea
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenues	16	18	33	35
Other
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenues	$ 204	$ 302	$ 488	$ 583