RESTRUCTURING RESTRUCTURING AND RELATED COSTS TABLE (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Restructuring Cost and Reserve [Line Items]
Provision for restructuring	$ 176	$ 10	$ 451	$ 32
Integration expenses	195	96	535	224
Operating Model 2020 [Member]
Restructuring Cost and Reserve [Line Items]
Employee termination costs	0	4	3	11
Other termination costs	7	6	20	21
Provision for restructuring	7	10	23	32
Accelerated depreciation	1	33	42	96
Asset impairment	2	9	44	119
Other shutdown costs	0	0	6	0
Total charges	10	52	115	247
Operating Model 2020 [Member] | Cost of products sold [Member]
Restructuring Cost and Reserve [Line Items]
Total charges	3	22	30	156
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	20	56	58
Operating Model 2020 [Member] | Other (income)/expense,net [Member]
Restructuring Cost and Reserve [Line Items]
Total charges	7	$ 10	29	$ 32
Celgene Integration [Member]
Restructuring Cost and Reserve [Line Items]
Employee termination costs	133		386
Other termination costs	36		42
Provision for restructuring	169		428
Integration expenses	195		535
Accelerated depreciation	6		6
Asset impairment	3		42
Other	0		3
Total charges	373		1,014
Celgene Integration [Member] | Marketing, selling and administrative [Member]
Restructuring Cost and Reserve [Line Items]
Total charges	6		7
Celgene Integration [Member] | Research and development [Member]
Restructuring Cost and Reserve [Line Items]
Total charges	3		42
Celgene Integration [Member] | Other (income)/expense,net [Member]
Restructuring Cost and Reserve [Line Items]
Total charges	$ 364		$ 965