LICENSING AND OTHER ARRANGEMENTS (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Licensing Arrangements [Line Items]
Amortization of Other Deferred Charges	$ (15)	$ (15)
Licensing and Other Arrangements Income	(232)	(252)
Royalty Income, Nonoperating	(135)	(158)
Up-front Licensing Fee	0	(30)
Contingent and Regulatory Milestone Income	0	(41)
Other Royalties
Licensing Arrangements [Line Items]
Royalty Income, Nonoperating	(3)	(5)
Keytruda Royalties
Licensing Arrangements [Line Items]
Royalty Income, Nonoperating	(192)	(161)
Tecentriq royalties
Licensing Arrangements [Line Items]
Royalty Income, Nonoperating	(22)	0
Diabetes business [Member]
Licensing Arrangements [Line Items]
Royalty Income, Nonoperating	$ (134)	$ (127)