RESTRUCTURING - Schedule of Restructuring and Related Costs (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2022	Mar. 31, 2021
Restructuring Cost and Reserve [Line Items]
Total charges	$ 130	$ 210
Employee termination costs	22	44
Other termination costs	1	1
Provision for restructuring	23	45
Integration expenses	105	141
Accelerated depreciation	2	0
Asset impairments	0	24
Cost of products sold
Restructuring Cost and Reserve [Line Items]
Total charges	0	24
Marketing, selling and administrative
Restructuring Cost and Reserve [Line Items]
Total charges	2	0
Other (income)/expense, net
Restructuring Cost and Reserve [Line Items]
Total charges	128	186
Celgene Acquisition Plan
Restructuring Cost and Reserve [Line Items]
Total charges	127	173
MyoKardia Acquisition Plan
Restructuring Cost and Reserve [Line Items]
Total charges	$ 3	$ 37