RESTRUCTURING - Schedule of Restructuring and Related Costs (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2025	Sep. 30, 2024	Sep. 30, 2025	Sep. 30, 2024
Restructuring Cost and Reserve [Line Items]
Total charges	$ 232	$ 263	$ 701	$ 932
Employee termination costs	71	77	423	554
Provision for restructuring	75	78	432	558
Integration expenses	36	69	110	214
Accelerated depreciation	9	22	36	56
Asset impairments	111	93	128	95
Cost of products sold
Restructuring Cost and Reserve [Line Items]
Total charges	110	88	114	105
Selling, general and administrative
Restructuring Cost and Reserve [Line Items]
Total charges	1	7	6	19
Research and development
Restructuring Cost and Reserve [Line Items]
Total charges	10	21	49	36
Other (income)/expense, net
Restructuring Cost and Reserve [Line Items]
Total charges	111	147	532	772
Other termination costs
Restructuring Cost and Reserve [Line Items]
Other termination costs	4	1	8	4
Other shutdown costs, net
Restructuring Cost and Reserve [Line Items]
Other termination costs	1	1	(4)	9
2023 Restructuring Plan
Restructuring Cost and Reserve [Line Items]
Total charges	193	180	567	512
Celgene and Other Acquisition Plans
Restructuring Cost and Reserve [Line Items]
Total charges	$ 39	$ 83	$ 134	$ 420