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ACQUISITION, LICENSING AGREEMENTS AND ASSETS HELD FOR SALE - Narrative (Details) $ in Millions |  | 3 Months Ended | 6 Months Ended | 10 Months Ended | 12 Months Ended |
--- | --- | --- | --- | --- | --- | ---
Mar. 06, 2019 USD ($) | Jun. 30, 2020 USD ($) | Sep. 30, 2019 USD ($) | Jun. 30, 2019 USD ($) | Jun. 30, 2020 USD ($) | Jun. 30, 2019 USD ($) | Dec. 31, 2019 USD ($) product | Dec. 31, 2019 USD ($) product | Dec. 31, 2018 USD ($) | Mar. 31, 2020 USD ($)
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |
Advisory, legal, valuation, accounting and other similar services, included in other expense, net |  | $ 107 |  | $ 8 | $ 130 | $ 5 |  |  |  |
Assets reclassified, held and used |  | $ 31,396 |  |  | $ 31,396 |  | $ 33,863 | $ 33,863 |  |
Disposal Group, Held-for-sale, Not Discontinued Operations | Certain Products For Disposal, September 2019 |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |
Revenue associated with products for disposal |  |  |  |  |  |  |  | $ 14 | $ 19 |
Impairment of long-lived assets classified as held for sale |  |  | $ 8 |  |  |  |  |  |  |
Disposal Group, Held-for-sale, Not Discontinued Operations | Certain Products For Disposal, September 2019 | Restatement Adjustment |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |
Assets reclassified, held for sale |  |  |  |  |  |  |  |  |  | $ 39
Assets reclassified, held and used |  |  |  |  |  |  |  |  |  | $ 39
Disposal Group, Held-for-sale, Not Discontinued Operations | Certain Products For Disposal, September 2019 | Diversified Products |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |
Number of products for disposal | product |  |  |  |  |  |  | 1 | 1 |  |
Synergy Pharmaceuticals Inc. |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |
Cash payments to acquire certain assets and assumed liabilities | $ 180 |  |  |  |  |  |  |  |  |
Revenue of acquiree |  |  |  |  |  |  | $ 55 |  |  |
Operating results of acquiree |  |  |  |  |  |  | $ 0 |  |  |
Pro forma revenue |  |  |  |  |  | 0 |  | $ 0 |  |
Pro forma operating results |  |  |  |  |  | 0 |  | $ 0 |  |
Advisory, legal, valuation, accounting and other similar services, included in other expense, net |  |  |  |  |  | $ 8 |  |  |  |

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