LEASES - Supplemental Cash Flows (Details) $ in Millions	12 Months Ended
	Dec. 31, 2019 USD ($)
Leases [Abstract]
Operating cash flows	$ 14
Investing cash flows	40
ROU asset obtained in exchange for lease obligations (in millions)	$ 122
Weighted-average remaining lease term (in years)	4 years 9 months
Weighted-average discount rate	12.20%
ROU asset obtained in exchange for lease obligations (in millions)	$ 2
Weighted-average remaining lease term (in years)	2 years 3 months 29 days
Weighted-average discount rate	8.50%