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ACQUISITION, LICENSING AGREEMENTS AND ASSETS HELD FOR SALE - Narrative (Details) - USD ($) |  | 3 Months Ended | 6 Months Ended | 12 Months Ended | 15 Months Ended
--- | --- | --- | --- | --- | ---
Sep. 21, 2020 | Mar. 31, 2021 | Dec. 31, 2020 | Sep. 30, 2020 | Mar. 31, 2020 | Jun. 30, 2021 | Dec. 31, 2020 | Mar. 31, 2021
Business Acquisition [Line Items] |  |  |  |  |  |  |  |
Other (income) expense, net |  | $ (30,000,000) |  |  | $ 36,000,000 |  |  |
Disposal Group, Held-for-sale, Not Discontinued Operations | Amoun |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |
Impairment of long-lived assets |  | $ 68,000,000 | $ 96,000,000 |  |  |  |  | $ 164,000,000
Noncash cumulative foreign currency translation loss |  |  |  |  |  |  | $ 340,000,000 |
Disposal Group, Held-for-sale, Not Discontinued Operations | Amoun | Subsequent Event | Forecast |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |
Cash proceeds from divestiture |  |  |  |  |  | $ 740,000,000 |  |
Allegro |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |
Potential asset acquisition, aggregate purchase price | $ 50,000,000 |  |  |  |  |  |  |
Potential asset acquisition, upfront payment included in aggregate purchase price | 10,000,000 |  |  |  |  |  |  |
Potential asset acquisition, additional funding payment included in aggregate purchase price | $ 40,000,000 |  |  |  |  |  |  |
Other (income) expense, net |  |  |  | $ 10,000,000 |  |  |  |

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