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ACQUISITION, LICENSING AGREEMENTS AND ASSETS HELD FOR SALE - Narrative (Details) $ in Millions		3 Months Ended			10 Months Ended	12 Months Ended
	Mar. 06, 2019 USD ($)	Mar. 31, 2020 USD ($)	Sep. 30, 2019 USD ($)	Mar. 31, 2019 USD ($)	Dec. 31, 2019 USD ($) product	Dec. 31, 2019 USD ($) product	Dec. 31, 2018 USD ($)
Business Acquisition [Line Items]
Advisory, legal, valuation, accounting and other similar services, included in other (income) expense		$ 23		$ (3)
Assets reclassified, held and used		31,865			$ 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 since acquisition date					$ 55
Operating results of acquiree since acquisition					$ 0
Pro forma revenue				0		$ 0
Pro forma operating results				0		$ 0
Advisory, legal, valuation, accounting and other similar services, included in other (income) expense				$ 8

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