DEBT - Interest Expense Related To The Convertible Notes (Details) - USD ($) $ in Millions	3 Months Ended	9 Months Ended
Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Debt Instrument [Line Items]
Interest expense, debt	$ 31	$ 14	$ 100	$ 23
Convertible Notes \| Convertible Notes
Debt Instrument [Line Items]
Contractual interest expense	1	1	2	3
Amortization of debt discount	2	1	5	4
Amortization of debt issuance costs	0	1	1	1
Interest expense, debt	$ 3	$ 3	$ 8	$ 8

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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- Definition

Amount of amortization expense attributable to debt issuance costs.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
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- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

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- Definition

Represents the portion of interest incurred in the period on debt arrangements that was charged against earnings, excluding amortization of debt discount (premium) and financing costs.

+ References

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The net amount of nonoperating interest income (expense).

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