DEBT - Summary of Interest Expenses and Weighted-Average Effective Interest Rates Related To Convertible Senior Notes and Other Senior Notes (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Debt Instrument [Line Items]
Amortization of debt discount and debt issuance costs	$ 54	$ 64	$ 58
Convertible Senior Notes
Debt Instrument [Line Items]
Coupon interest expense	13	15	12
Amortization of debt discount and debt issuance costs	43	54	50
Total interest expense	$ 56	$ 69	$ 62
Weighted-average effective interest rate	3.80%	3.50%	3.20%
Senior Notes
Debt Instrument [Line Items]
Coupon interest expense	$ 257	$ 264	$ 160
Amortization of debt discount and debt issuance costs	10	9	6
Total interest expense	$ 267	$ 273	$ 166