DIVESTITURES (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Proceeds from Divestiture of Businesses, Net of Cash Divested	$ 170	$ 208	$ 341	$ 583
Disposal Group, Not Discontinued Operation, Gain (Loss) on Disposal	8	(25)	8	(70)
Business Sale Royalty Income	(162)	(217)	(328)	(427)
Diabetes business [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Proceeds from Divestiture of Businesses, Net of Cash Divested	164	155	328	243
Disposal Group, Not Discontinued Operation, Gain (Loss) on Disposal	0	0	0	0
Business Sale Royalty Income	(161)	(165)	(326)	(327)
Erbitux [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Proceeds from Divestiture of Businesses, Net of Cash Divested	3	50	8	109
Disposal Group, Not Discontinued Operation, Gain (Loss) on Disposal	0	0	0	0
Business Sale Royalty Income	0	(50)	0	(97)
Manufacturing Facility in Swords, Ireland [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Proceeds from Divestiture of Businesses, Net of Cash Divested	1	1	3	159
Disposal Group, Not Discontinued Operation, Gain (Loss) on Disposal	0	0	0	0
Business Sale Royalty Income	0	0	0	0
Other divestitures [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Proceeds from Divestiture of Businesses, Net of Cash Divested	2	2	2	72
Disposal Group, Not Discontinued Operation, Gain (Loss) on Disposal	8	(25)	8	(70)
Business Sale Royalty Income	$ (1)	$ (2)	$ (2)	$ (3)