ACQUISITIONS, DIVESTITURES, LICENSING AND OTHER ARRANGEMENTS - Licensing and Other Arrangements (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2025	Jun. 30, 2024	Jun. 30, 2025	Jun. 30, 2024
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Contingent milestone income	$ 0	$ (25)	$ (40)	$ (25)
Amortization of deferred income	(12)	(12)	(24)	(24)
Royalty and licensing income	(162)	(191)	(421)	(352)
Keytruda royalties
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Royalty income, nonoperating	(132)	(137)	(284)	(270)
Tecentriq royalties
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Royalty income, nonoperating	(11)	(11)	(23)	(23)
Other royalties and licensing income
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Royalty income, nonoperating	$ (7)	$ (6)	$ (51)	$ (10)