RESTRUCTURING RESTRUCTURING AND RELATED COSTS TABLE (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Restructuring Cost and Reserve [Line Items]
Employee termination costs	$ 75	$ 107	$ 119	$ 256
Other termination costs	3	8	4	19
Provision for restructuring	78	115	123	275
Integration expenses	152	166	293	340
Accelerated depreciation	0	11	0	41
Asset impairment	0	39	24	81
Other shutdown costs	(11)	9	(11)	9
Total charges	219	340	429	746
Cost of products sold [Member]
Restructuring Cost and Reserve [Line Items]
Total charges	0	11	24	27
Marketing, selling and administrative [Member]
Restructuring Cost and Reserve [Line Items]
Total charges	0	1	0	1
Research and development [Member]
Restructuring Cost and Reserve [Line Items]
Total charges	0	39	0	95
Other (income)/expense,net [Member]
Restructuring Cost and Reserve [Line Items]
Total charges	219	289	405	623
Celgene Integration [Member]
Restructuring Cost and Reserve [Line Items]
Total charges	200	317	373	641
MyoKardia Acquisition Plan
Restructuring Cost and Reserve [Line Items]
Total charges	19	0	56	0
Operating Model 2020 [Member]
Restructuring Cost and Reserve [Line Items]
Total charges	$ 0	$ 23	$ 0	$ 105