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SHARE-BASED COMPENSATION - Summary of Share-based Compensation Expense (Details) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Components and classification of share-based compensation expense |  |  |
Share-based compensation | $ 105 | $ 102 | $ 87
Research and development expenses |  |  |
Components and classification of share-based compensation expense |  |  |
Share-based compensation | 11 | 9 | 9
Selling, general and administrative expenses |  |  |
Components and classification of share-based compensation expense |  |  |
Share-based compensation | 94 | 93 | 78
Stock options |  |  |
Components and classification of share-based compensation expense |  |  |
Share-based compensation | 15 | 21 | 23
RSUs |  |  |
Components and classification of share-based compensation expense |  |  |
Share-based compensation | $ 90 | $ 81 | $ 64

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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. + Details
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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=121586364&loc=d3e3602-108585 + Details
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