DIVESTITURES (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 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	$ 1,683	$ 364	$ 2,024	$ 947
Disposal Group, Not Discontinued Operation, Gain (Loss) on Disposal	(1,179)	(108)	(1,171)	(178)
Royalty Income, Nonoperating	(177)	(217)	(505)	(644)
UPSA [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	1,510	0	1,510	0
Disposal Group, Not Discontinued Operation, Gain (Loss) on Disposal	(1,176)	0	(1,160)	0
Royalty Income, Nonoperating	0	0	0	0
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	163	165	491	408
Disposal Group, Not Discontinued Operation, Gain (Loss) on Disposal	0	0	0	0
Royalty Income, Nonoperating	(171)	(170)	(497)	(497)
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	59	11	168
Disposal Group, Not Discontinued Operation, Gain (Loss) on Disposal	0	0	0	0
Royalty Income, Nonoperating	0	(48)	0	(145)
Manufacturing Facility [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	0	0	3	159
Disposal Group, Not Discontinued Operation, Gain (Loss) on Disposal	1	0	1	0
Royalty Income, Nonoperating	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	7	140	9	212
Disposal Group, Not Discontinued Operation, Gain (Loss) on Disposal	(4)	(108)	(12)	(178)
Royalty Income, Nonoperating	$ (6)		$ (8)	$ (2)
Royalty Expense		$ 1