OTHER INCOME (NET) OTHER INCOME (NET) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Other than Temporary Impairment, Credit Losses Recognized in Earnings [Line Items]
Interest Expense	$ 183	$ 196	$ 167
Investment Income, Interest	(173)	(126)	(97)
Loss/(gain) on equity investments	512	(23)	37
Restructuring Charges	131	293	109
Gain (Loss) Related to Litigation Settlement	76	(487)	47
Equity in net loss of affiliates	(93)	(75)	(77)
Divestiture gain	(178)	(164)	(576)
Other Income Received From Alliance Partners	(1,353)	(1,351)	(719)
Alliance Transitional Services	(12)	(37)	(238)
Defined Benefit Plan, Net Periodic Benefit Cost (Credit)	(27)	(1)	(72)
Impairment of Intangible Assets, Finite-lived	64	0	15
Gain (Loss) on Extinguishment of Debt	0	109	0
Other Other Income Expense	20	(16)	(44)
Other Nonoperating Income (Expense)	(850)	(1,682)	$ (1,448)
Proceeds from Legal Settlements		481
Nektar [Member]
Other than Temporary Impairment, Credit Losses Recognized in Earnings [Line Items]
Loss/(gain) on equity investments	$ 534
Biogen & Roche [Member]
Other than Temporary Impairment, Credit Losses Recognized in Earnings [Line Items]
Upfront licensing fees		$ 470