ACQUISITIONS, DIVESTITURES, LICENSING AND OTHER ARRANGEMENTS - Licensing and Other Arrangements (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items]
Contingent milestone income	$ (74)	$ (91)	$ (50)
Amortization of deferred income	(48)	(51)	(53)
Total	(736)	(1,488)	(1,283)
Keytruda Royalties
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items]
Royalty income, nonoperating	(546)	(1,186)	(1,001)
Tecentriq Royalties
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items]
Royalty income, nonoperating	(47)	(107)	(93)
Biohaven sublicense income
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items]
Biohaven sublicense income	0	0	(55)
Other royalties
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items]
Royalty income, nonoperating	$ (21)	$ (53)	$ (31)