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SHARE-BASED COMPENSATION - Summary of Share-based Compensation Expense (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Components and classification of share-based compensation expense
Share-based compensation	$ 102	$ 87	$ 87
Research and development expenses
Components and classification of share-based compensation expense
Share-based compensation	9	9	8
Selling, general and administrative expenses
Components and classification of share-based compensation expense
Share-based compensation	93	78	79
Stock options
Components and classification of share-based compensation expense
Share-based compensation	21	23	18
RSUs
Components and classification of share-based compensation expense
Share-based compensation	$ 81	$ 64	$ 69

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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

Amount of noncash expense for share-based payment arrangement.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 28
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=118932676&loc=d3e3602-108585

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