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ACQUISITION, LICENSING AGREEMENTS AND DIVESTITURE - Narrative (Details) - USD ($) |  |  | 3 Months Ended | 9 Months Ended | 12 Months Ended
--- | --- | --- | --- | --- | ---
Jul. 26, 2021 | Jun. 23, 2021 | Sep. 30, 2021 | Dec. 31, 2020 | Sep. 30, 2020 | Sep. 30, 2021 | Sep. 30, 2021
Business Acquisition [Line Items] |  |  |  |  |  |  |
Upfront payment converted into minor equity interest |  | $ 10,000,000 |  |  |  |  |
Expected additional payments |  |  | $ 0 |  |  | $ 0 | $ 0
Disposal Group, Held-for-sale, Not Discontinued Operations | Amoun |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |
Impairment of long-lived assets |  |  |  | $ 96,000,000 |  |  |
Disposal Group, Disposed of by Sale, Not Discontinued Operations | Amoun |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |
Cash proceeds from divestiture | $ 740,000,000 |  |  |  |  |  |
Impairment of long-lived assets |  |  | 26,000,000 |  |  |  | 210,000,000
Noncash cumulative foreign currency translation loss |  |  |  |  |  |  | $ 340,000,000
Disposal Group, Disposed of by Sale, Not Discontinued Operations | Amoun | Asset impairments, including loss on assets held for sale |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |
Impairment of long-lived assets |  |  |  |  |  | $ 88,000,000 |
Disposal Group, Disposed of by Sale, Not Discontinued Operations | Amoun | Other (income) expense, net |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |
Impairment of long-lived assets |  |  | $ 26,000,000 |  |  |  |
Allegro |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |
Acquired IPR&D, included in other (income) expense, net |  |  |  |  | $ 10,000,000 |  |

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