NATURE OF OPERATIONS AND SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Equity Investments (Details) - USD ($)		3 Months Ended		9 Months Ended
	Aug. 29, 2019	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019	Dec. 31, 2019
Schedule of Equity Method Investments [Line Items]
Equity investments, net of cumulative impairment		$ 26,000,000		$ 26,000,000		$ 28,000,000
Cumulative impairment		7,000,000		7,000,000		$ 7,000,000
Impairment recorded		0	$ 0	0	$ 2,000,000
Income (loss) from equity method investments		(10,000,000)	(12,000,000)	(23,000,000)	(38,000,000)
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Schedule of Equity Method Investments [Line Items]
Equity interest percentage	20.00%
Cash consideration	$ 346,000,000
Income (loss) from equity method investments		$ (3,000,000)	$ 1,000,000	$ 3,000,000	$ 1,000,000