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ACQUISITIONS, LICENSING AGREEMENTS AND ASSETS HELD FOR SALE - Narrative (Details) |  |  |  | 1 Months Ended | 3 Months Ended | 10 Months Ended | 12 Months Ended
--- | --- | --- | --- | --- | --- | --- | ---
Sep. 21, 2020 USD ($) | Mar. 06, 2019 USD ($) | Oct. 16, 2018 USD ($) | Sep. 30, 2020 USD ($) | Dec. 31, 2020 USD ($) | Dec. 31, 2019 USD ($) | Dec. 31, 2020 USD ($) businessCombination | Dec. 31, 2019 USD ($) businessCombination | Dec. 31, 2018 USD ($) businessCombination
Business Combinations |  |  |  |  |  |  |  |  |
Other expense, net |  |  |  |  |  |  | $ 454,000,000 | $ 1,414,000,000 | $ (20,000,000)
Reduction of additional paid-in capital |  |  |  |  |  |  |  |  | $ 18,000,000
Number of other material business combinations | businessCombination |  |  |  |  |  |  | 0 | 0 | 0
Held For Sale |  |  |  |  |  |  |  |  |
Business Combinations |  |  |  |  |  |  |  |  |
Impairment of long-lived assets |  |  |  |  |  |  |  |  | $ 5,000,000
Held For Sale | A Certain International Business |  |  |  |  |  |  |  |  |
Business Combinations |  |  |  |  |  |  |  |  |
Impairment of long-lived assets |  |  |  |  |  |  | $ 96,000,000 |  |
Noncash cumulative foreign currency translation loss |  |  |  |  |  |  | $ 344,000,000 |  |
Additional Paid-In Capital |  |  |  |  |  |  |  |  |
Business Combinations |  |  |  |  |  |  |  |  |
Reduction of additional paid-in capital |  |  |  |  |  |  |  |  | $ 15,000,000
Allegro |  |  |  |  |  |  |  |  |
Business Combinations |  |  |  |  |  |  |  |  |
Other expense, net |  |  |  |  | $ 10,000,000 |  |  |  |
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 |  |  | $ 40,000,000 |  |  |  |  |
Synergy |  |  |  |  |  |  |  |  |
Business Combinations |  |  |  |  |  |  |  |  |
Cash payments to acquire certain assets and assumed liabilities |  | $ 180,000,000 |  |  |  |  |  |  |
Revenue of acquiree since acquisition date |  |  |  |  |  | $ 55,000,000 |  |  |
Pro-forma revenue |  |  |  |  |  |  |  | $ 0 |
Pro-forma operating results |  |  |  |  |  |  |  | 0 |
Operating results of acquiree since acquisition |  |  |  |  |  | $ 0 |  |  |
Other expense, net |  |  |  |  |  |  |  | $ 8,000,000 |
Medpharma |  |  |  |  |  |  |  |  |
Business Combinations |  |  |  |  |  |  |  |  |
Cash payments to acquire certain assets and assumed liabilities |  |  | $ 18,000,000 |  |  |  |  |  |
Percentage interest acquired |  |  | 40.00% |  |  |  |  |  |
Medpharma | Additional Paid-In Capital |  |  |  |  |  |  |  |  |
Business Combinations |  |  |  |  |  |  |  |  |
Reduction of additional paid-in capital |  |  | $ 15,000,000 |  |  |  |  |  |

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