ACQUISITIONS, DIVESTITURES, LICENSING AND OTHER ARRANGEMENTS - Licensing and Other Arrangements (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items]
Upfront licensing fees	$ 0	$ (34)	$ (30)
Contingent regulatory milestone income	(50)	(18)	(72)
Amortization of deferred income	(53)	(39)	(58)
Total	(1,283)	(1,067)	(883)
Keytruda Royalties
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items]
Royalty income, nonoperating	(1,001)	(841)	(681)
Tecentriq Royalties
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items]
Royalty income, nonoperating	(93)	(90)	(19)
Biohaven
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items]
Biohaven sublicense income	(55)	0	0
Other Royalties
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items]
Royalty income, nonoperating	$ (31)	$ (45)	$ (23)