ACQUISITIONS, DIVESTITURES AND LICENSING ARRANGEMENTS ACQUISITION - ASSETS ACQUIRED AND LIABILITIES ASSUMED (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Nov. 20, 2019
Business Acquisition [Line Items]
Goodwill	$ 20,547	$ 22,488
Celgene [Member]
Business Acquisition [Line Items]
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Cash and Equivalents	11,179		$ 11,179
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Current Assets, Receivables	2,652		2,652
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Inventory	4,511		4,511
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Property, Plant, and Equipment	1,065		1,342
Business Combination, Provisional Information, Initial Accounting Incomplete, Adjustment, Property, Plant, and Equipment	(277)
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Intangible Assets, Other than Goodwill	63,927		64,027
Business Combination, Provisional Information, Initial Accounting Incomplete, Adjustment, Intangibles	(100)
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Assets Held-For-Sale	13,400		13,400
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Other Assets	3,451		3,408
Business Combination, Provisional Information, Initial Accounting Incomplete, Adjustment, Other Assets	43
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Current Liabilities, Accounts Payable	(363)		(363)
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Income Taxes	(2,756)		(2,718)
Business Combination, Provisional Information, Initial Accounting Incomplete, Adjustment, Income Taxes	(38)
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Deferred Tax Liabilities	(5,003)		(7,339)
Business Combination, Provisional Information, Initial Accounting Incomplete, Adjustments, Deferred Income Tax Liabilities	2,336
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Debt	(21,782)		(21,782)
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Other Liabilities	(4,002)		(4,017)
Business Combination, Provisional Information, Initial Accounting Incomplete, Adjustments, Other Liabilities	15
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Net	66,279		64,300
Business Combination, Provisional Information, Initial Accounting Incomplete, Adjustments, Net	1,979
Goodwill	13,990		15,969
Goodwill, Purchase Accounting Adjustments	(1,979)
Business Combination, Recognized Identifiable Assets Acquired, Goodwill, and Liabilities Assumed, Net	$ 80,269		80,269
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Finite-Lived Intangibles			44,400
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life		5 years 1 month 6 days
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Indefinite-Lived Intangible Assets			19,500
Celgene [Member] | Otezla [Member] | Inventories [Member]
Business Acquisition [Line Items]
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Assets Held-For-Sale			381
Celgene [Member] | Otezla [Member] | Finite-Lived Intangible Assets [Member]
Business Acquisition [Line Items]
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Assets Held-For-Sale			13,000
Celgene [Member] | Otezla [Member] | Accrued Liabilities [Member]
Business Acquisition [Line Items]
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Assets Held-For-Sale			19
Celgene [Member] | Otezla [Member] | Other Noncurrent Liabilities [Member]
Business Acquisition [Line Items]
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Assets Held-For-Sale			$ 5