INTANGIBLE ASSETS AND GOODWILL - Schedule of Intangible Assets (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	$ 25,613	$ 25,485
Accumulated Amortization and Impairments	(17,123)	(15,218)
Net Carrying Amount	8,490	10,267
Indefinite-lived Intangible Assets [Line Items]
Gross Carrying Amount	27,324	27,219
Intangible Assets, Net (Excluding Goodwill)	10,201	12,001
Acquired IPR&D not in service
Indefinite-lived Intangible Assets [Line Items]
Net Carrying Amount	13	36
B&L Trademark
Indefinite-lived Intangible Assets [Line Items]
Net Carrying Amount	$ 1,698	1,698
Product brands
Finite-Lived Intangible Assets [Line Items]
Weighted- Average Remaining Useful Lives (Years)	7 years
Gross Carrying Amount	$ 21,011	20,891
Accumulated Amortization and Impairments	(13,544)	(11,958)
Net Carrying Amount	$ 7,467	8,933
B&L Trademark
Finite-Lived Intangible Assets [Line Items]
Weighted- Average Remaining Useful Lives (Years)	8 years
Gross Carrying Amount	$ 930	926
Accumulated Amortization and Impairments	(338)	(263)
Net Carrying Amount	$ 592	663
Product rights/patents
Finite-Lived Intangible Assets [Line Items]
Weighted- Average Remaining Useful Lives (Years)	4 years
Gross Carrying Amount	$ 3,297	3,292
Accumulated Amortization and Impairments	(2,887)	(2,658)
Net Carrying Amount	$ 410	634
Partner relationships
Finite-Lived Intangible Assets [Line Items]
Weighted- Average Remaining Useful Lives (Years)	2 years
Gross Carrying Amount	$ 166	168
Accumulated Amortization and Impairments	(165)	(166)
Net Carrying Amount	$ 1	2
Technology and other
Finite-Lived Intangible Assets [Line Items]
Weighted- Average Remaining Useful Lives (Years)	3 years
Gross Carrying Amount	$ 209	208
Accumulated Amortization and Impairments	(189)	(173)
Net Carrying Amount	$ 20	$ 35