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
	Mar. 31, 2022	Mar. 31, 2021
Accounting Standards Update 2020-06
Debt Instrument
Total interest expense	$ (6)
Convertible Debt
Debt Instrument
Coupon interest expense	2	$ 4
Amortization of debt discount and debt issuance costs	1	14
Total interest expense	$ 3	$ 18
Weighted-average effective interest rate	1.20%	3.90%
Senior Notes
Debt Instrument
Coupon interest expense	$ 58	$ 78
Amortization of debt discount and debt issuance costs	3	2
Total interest expense	$ 61	$ 80