OTHER (INCOME)/EXPENSE, NET - Schedule of Other Income (Expense) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Alliance Statement [Line Items]
Interest expense	$ 1,947	$ 1,166	$ 1,232
Royalty income - divestitures (Note 4)	(1,104)	(862)	(832)
Royalty and licensing income (Note 4)	(736)	(1,488)	(1,283)
Provision for restructuring (Note 6)	635	365	75
Investment income	(478)	(449)	(171)
Integration expenses (Note 6)	284	242	440
Litigation and other settlements (a)	84	(390)	178
Acquisition expense	50	32	0
Intangible asset impairment	47	29	0
Equity investment losses/(gains), net (Note 9)	(16)	160	801
Loss on debt redemption (Note 10)	0	0	266
Divestiture losses/(gains) (Note 4)	15	0	(211)
Other	165	37	81
Other (income)/expense, net	$ 893	$ (1,158)	$ 576
Defined Benefit Plan Net Periodic Benefit Cost Credit Settlement Gain Loss Statement Of Income Or Comprehensive Income Extensible List Not Disclosed Flag	pension settlement charges
Pension settlement charges	$ 119
Eisai
Alliance Statement [Line Items]
Income related to collaboration termination	$ 90