DEBT - Summary of Interest Expenses and Weighted-Average Effective Interest Rates Related To Convertible Senior Notes and Other Senior Notes (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2022	Jun. 30, 2021	Jun. 30, 2022	Jun. 30, 2021
Accounting Standards Update 2020-06
Debt Instrument
Total interest expense	$ (7)		$ (13)
Convertible Debt
Debt Instrument
Coupon interest expense	1	$ 4	3	$ 8
Amortization of debt discount and debt issuance costs	1	10	2	24
Total interest expense	$ 2	$ 14	$ 5	$ 32
Weighted-average effective interest rate	1.20%	3.50%	1.20%	3.70%
Senior Notes
Debt Instrument
Coupon interest expense	$ 56	$ 60	$ 114	$ 138
Amortization of debt discount and debt issuance costs	2	4	5	6
Total interest expense	$ 58	$ 64	$ 119	$ 144