DEBT - Interest Expense Related To The Convertible Notes (Details) - Convertible notes - USD ($) $ in Millions	3 Months Ended	6 Months Ended	9 Months Ended
Sep. 30, 2022	Sep. 30, 2021	Jun. 30, 2022	Sep. 30, 2022	Sep. 30, 2021
Debt Instrument [Line Items]
Interest expense	$ 1	$ 0		$ 4	$ 0
2022 Convertible Notes
Debt Instrument [Line Items]
Contractual interest expense	1	1		3	3
Amortization of debt discount	5	1		5	5
Amortization of debt issuance costs	0	0	$ 1	1	1
Interest expense	6	2		9	9
2026 Convertible Notes
Debt Instrument [Line Items]
Amortization of debt discount	0	6		0	16
Amortization of debt issuance costs	1	1		2	2
Interest expense	$ 1	$ 7		$ 2	$ 18

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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