RESTRUCTURING RESTRUCTURING AND RELATED COSTS TABLE (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Restructuring Cost and Reserve [Line Items]
Employee termination costs	$ 44	$ 149
Other termination costs	1	11
Provision for restructuring	45	160
Integration expenses	141	174
Accelerated depreciation	0	30
Asset impairment	24	42
Total charges	210	406
Cost of products sold [Member]
Restructuring Cost and Reserve [Line Items]
Total charges	24	16
Research and development [Member]
Restructuring Cost and Reserve [Line Items]
Total charges	0	56
Other (income)/expense,net [Member]
Restructuring Cost and Reserve [Line Items]
Total charges	186	334
Celgene Integration [Member]
Restructuring Cost and Reserve [Line Items]
Total charges	173	324
MyoKardia Acquisition Plan
Restructuring Cost and Reserve [Line Items]
Total charges	37	0
Operating Model 2020 [Member]
Restructuring Cost and Reserve [Line Items]
Total charges	$ 0	$ 82