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ACQUISITIONS, LICENSING AGREEMENTS AND DIVESTITURE - Narrative (Details) |  |  |  | 3 Months Ended | 10 Months Ended | 12 Months Ended | 24 Months Ended
--- | --- | --- | --- | --- | --- | --- | ---
Jul. 26, 2021 USD ($) | Jun. 23, 2021 USD ($) | Mar. 06, 2019 USD ($) | Dec. 31, 2020 USD ($) | Sep. 30, 2020 USD ($) | Dec. 31, 2019 USD ($) | Dec. 31, 2021 USD ($) businessCombination | Dec. 31, 2020 USD ($) businessCombination | Dec. 31, 2019 USD ($) businessCombination | Dec. 31, 2021 USD ($)
Business Combinations |  |  |  |  |  |  |  |  |  |
Other expense, net |  |  |  |  |  |  | $ 373,000,000 | $ 502,000,000 | $ 1,426,000,000 |
Number of other material business combinations | businessCombination |  |  |  |  |  |  | 0 | 0 | 0 |
Upfront payment converted into minor equity interest |  | $ 10,000,000 |  |  |  |  |  |  |  |
Expected additional payments |  |  |  |  |  |  | $ 0 |  |  | $ 0
Held For Sale | Amoun Pharmaceutical Company S.A.E |  |  |  |  |  |  |  |  |  |
Business Combinations |  |  |  |  |  |  |  |  |  |
Impairment of long-lived assets |  |  |  | $ 96,000,000 |  |  |  |  |  |
Disposal Group, Disposed of by Sale, Not Discontinued Operations | Amoun Pharmaceutical Company S.A.E |  |  |  |  |  |  |  |  |  |
Business Combinations |  |  |  |  |  |  |  |  |  |
Cash proceeds from divestiture | $ 740,000,000 |  |  |  |  |  |  |  |  |
Impairment of long-lived assets |  |  |  |  |  |  | 26,000,000 |  |  |
Disposal Group, Held-for-sale or Disposed of by Sale, Not Discontinued Operations | Amoun Pharmaceutical Company S.A.E |  |  |  |  |  |  |  |  |  |
Business Combinations |  |  |  |  |  |  |  |  |  |
Impairment of long-lived assets |  |  |  |  |  |  | $ 88,000,000 |  |  | 210,000,000
Noncash cumulative foreign currency translation loss |  |  |  |  |  |  |  |  |  | $ 340,000,000
Allegro |  |  |  |  |  |  |  |  |  |
Business Combinations |  |  |  |  |  |  |  |  |  |
Acquired IPR&D, included in other expense, net |  |  |  |  | $ 10,000,000 |  |  |  |  |
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 |

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