OTHER ARRANGEMENTS (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019	Oct. 05, 2020
Licensing Arrangements [Line Items]
Amortization of Other Deferred Charges	$ (14)	$ (14)	$ (44)	$ (44)
Licensing and Other Arrangements Income	(211)	(179)	(644)	(462)
Royalty Income, Nonoperating	(192)	(177)	(480)	(505)
Up-front Licensing Fee	0	(24)	(30)	(24)
Contingent and Regulatory Milestone Income	(16)	(6)	(62)	(15)
Other Royalties
Licensing Arrangements [Line Items]
Royalty Income, Nonoperating	(5)	(3)	(16)	(6)
Keytruda Royalties
Licensing Arrangements [Line Items]
Royalty Income, Nonoperating	(176)	(132)	(492)	(373)
Diabetes business [Member]
Licensing Arrangements [Line Items]
Royalty Income, Nonoperating	$ (148)	$ (171)	$ (404)	$ (497)
Dragonfly Therapeutics, Inc. [Member] | Subsequent Event [Member]
Licensing Arrangements [Line Items]
Contingent and Regulatory Milestone Payments					$ 2,800
License and Other Arrangements Upfront Payments					$ 400