RESTRUCTURING RESTRUCTURING AND RELATED COSTS TABLE (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Restructuring Cost and Reserve [Line Items]
Provision for restructuring	$ 115	$ 10	$ 275	$ 22
Integration expenses	166	106	340	128
Operating Model 2020 [Member]
Restructuring Cost and Reserve [Line Items]
Employee termination costs	0	3	3	7
Other termination costs	6	7	13	15
Provision for restructuring	6	10	16	22
Accelerated depreciation	11	32	41	63
Asset impairment	0	109	42	110
Other shutdown costs	6	0	6	0
Total charges	23	151	105	195
Operating Model 2020 [Member] | Cost of products sold [Member]
Restructuring Cost and Reserve [Line Items]
Total charges	11	122	27	134
Operating Model 2020 [Member] | Marketing, selling and administrative [Member]
Restructuring Cost and Reserve [Line Items]
Total charges	0	0	0	1
Operating Model 2020 [Member] | Research and development [Member]
Restructuring Cost and Reserve [Line Items]
Total charges	0	19	56	38
Operating Model 2020 [Member] | Other (income)/expense,net [Member]
Restructuring Cost and Reserve [Line Items]
Total charges	12	$ 10	22	$ 22
Celgene Integration [Member]
Restructuring Cost and Reserve [Line Items]
Employee termination costs	107		253
Other termination costs	2		6
Provision for restructuring	109		259
Integration expenses	166		340
Asset impairment	39		39
Other	3		3
Total charges	317		641
Celgene Integration [Member] | Marketing, selling and administrative [Member]
Restructuring Cost and Reserve [Line Items]
Total charges	1		1
Celgene Integration [Member] | Research and development [Member]
Restructuring Cost and Reserve [Line Items]
Total charges	39		39
Celgene Integration [Member] | Other (income)/expense,net [Member]
Restructuring Cost and Reserve [Line Items]
Total charges	$ 277		$ 601