DIVESTITURES, LICENSING AND OTHER ARRANGEMENTS - Licensing and Other Arrangements (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2022	Sep. 30, 2021
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Royalty income, nonoperating	$ (205)	$ (160)	$ (597)	$ (447)
Contingent milestone income	0	(10)	(46)	(12)
Amortization of deferred income	(18)	3	(41)	(27)
Total	(374)	(265)	(967)	(750)
Keytruda Royalties
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Royalty income, nonoperating	(268)	(215)	(732)	(611)
Tecentriq royalties
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Royalty income, nonoperating	(24)	(22)	(68)	(67)
Biohaven
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Biohaven sublicense income	(55)	0	(55)	0
Other Royalties
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Royalty income, nonoperating	$ (9)	$ (21)	$ (25)	$ (33)