DEBT - Interest Expense Related To The Convertible Notes (Details) - Convertible Notes - USD ($) $ in Millions	12 Months Ended
Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
2022 Convertible Notes
Debt Instrument [Line Items]
Contractual interest expense	$ 3	$ 3	$ 3
Amortization of debt discount	8	7	6
Debt issuance cost amortization	1	1	2
Interest expense	12	11	11
2026 Convertible Notes
Debt Instrument [Line Items]
Amortization of debt discount	22	0	0
Debt issuance cost amortization	2	0	0
Interest expense	$ 24	$ 0	$ 0

Amount of noncash expense included in interest expense to amortize debt discount and premium associated with the related debt instruments. Excludes amortization of financing costs. Alternate captions include noncash interest expense.

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Amount of amortization expense attributable to debt issuance costs.

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Amount of the cost of borrowed funds accounted for as interest expense for debt.

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