DIVESTITURES (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Proceeds from Divestiture of Businesses, Net of Cash Divested	$ 202	$ 141	$ 382	$ 336
Divestiture losses/(gains)	(11)	9	(11)	(7)
Royalty Income, Nonoperating	(152)	(130)	(287)	(288)
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	132	127	296	280
Divestiture losses/(gains)	0	0	0	0
Royalty Income, Nonoperating	(152)	(129)	(286)	(256)
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	6	3	6	7
Divestiture losses/(gains)	0	0	0	0
Royalty Income, Nonoperating	0	0	0	0
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	23	10	23	10
Divestiture losses/(gains)	0	0	0	(1)
Royalty Income, Nonoperating	0	0	0	0
Avapro, Avalide, and Plavix [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			5	7
Divestiture losses/(gains)			0	(12)
Royalty Income, Nonoperating			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	41	1	52	32
Divestiture losses/(gains)	(11)	9	(11)	6
Royalty Income, Nonoperating	$ 0	$ (1)	$ (1)	$ (32)