ACQUISITIONS (Details) - USD ($) $ / shares in Units, $ in Millions	9 Months Ended
	Sep. 30, 2020	Oct. 05, 2020	Dec. 31, 2019	Nov. 20, 2019
Business Acquisition [Line Items]
Other assets	$ 3,453			$ 3,408
Goodwill	20,517		$ 22,488
Cormorant [Member]
Business Acquisition [Line Items]
Contingent and Regulatory Milestone Payments	100
MyoKardia [Member] | Subsequent Event [Member]
Business Acquisition [Line Items]
Asset Acquisition Payment		$ 13,100
Business Acquisition, Share Price		$ 225.00
Forbius [Member]
Business Acquisition [Line Items]
Contingent and Regulatory Milestone Payments	815
Asset Acquisition Payment	185
Deferred Tax Assets, Net	7
Celgene [Member]
Business Acquisition [Line Items]
Cash and cash equivalents	11,179			11,179
Receivables	2,652			2,652
Inventories	4,511			4,511
Property, plant, and equipment	1,065			1,342
Measurement period adjustments - Property, plant, and equipment	(277)
Intangible assets	63,927			64,027
Measurement period adjustments - Intangible assets	(100)
Otezla assets held-for-sale	13,400			13,400
Business Combination, Provisional Information, Initial Accounting Incomplete, Adjustment, Other Assets	45
Accounts payable	(363)			(363)
Income taxes payable	(2,765)			(2,718)
Measurement period adjustments - Income taxes payable	(47)
Deferred income tax liabilities	(4,989)			(7,339)
Measurement period adjustments - Deferred income tax liabilities	2,350
Debt	(21,782)			(21,782)
Other liabilities	(4,002)			(4,017)
Measurement period adjustments - Other liabilities	15
Identifiable net assets acquired	66,286			64,300
Measurement period adjustments - Identifiable net assets acquired	1,986
Goodwill	13,983			15,969
Measurement period adjustments - Goodwill	(1,986)
Total consideration transferred	$ 80,269			$ 80,269