INTANGIBLE ASSETS AND GOODWILL - Major Components of Intangible Assets (Details) - USD ($) $ in Millions	3 Months Ended						9 Months Ended
	Sep. 30, 2016	Jun. 30, 2016	Mar. 31, 2016	Dec. 31, 2015	Sep. 30, 2015	Jun. 30, 2015	Sep. 30, 2016
Finite-lived intangible assets:
Gross Carrying Amount	$ 27,899.5			$ 28,186.7			$ 27,899.5
Accumulated Amortization, Including Impairments	(9,350.2)			(7,411.6)			(9,350.2)
Net Carrying Amount	18,549.3			20,775.1			18,549.3
Total intangible assets
Gross Carrying Amount	29,859.6			30,494.6			29,859.6
Net Carrying Amount	20,509.4			23,083.0			20,509.4
Impairment of intangible assets, finite-lived	142.0	$ 215.0	$ 16.0	79.0
Write-off of property, plant, and equipment				23.0
Ezogabine Retigabine
Total intangible assets
Impairment of intangible assets, finite-lived				27.0
Zelapar
Total intangible assets
Impairment of intangible assets, finite-lived					$ 26.0
Branded Rx
Total intangible assets
Allocations to assets held for sale		37.0
IBSChek, U.S. Diversified Products Segment
Total intangible assets
Impairment of intangible assets, finite-lived	25.0
IPR&D
Indefinite-lived intangible assets:
Indefinite-lived intangible assets	262.6			610.4			262.6
Total intangible assets
IPR&D write-off		14.0		28.0	$ 90.0	$ 12.0
IPR&D | Oral Relistor
Total intangible assets
Reduction of IPR&D due to reclassification	304.0
Corporate brand
Indefinite-lived intangible assets:
Indefinite-lived intangible assets	1,697.5			1,697.5			1,697.5
Product brands
Finite-lived intangible assets:
Gross Carrying Amount	21,959.0			22,082.8			21,959.0
Accumulated Amortization, Including Impairments	(6,831.2)			(5,236.4)			(6,831.2)
Net Carrying Amount	15,127.8			16,846.4			15,127.8
Corporate brand
Finite-lived intangible assets:
Gross Carrying Amount	1,030.4			1,066.1			1,030.4
Accumulated Amortization, Including Impairments	(138.8)			(107.1)			(138.8)
Net Carrying Amount	891.6			959.0			891.6
Product rights
Finite-lived intangible assets:
Gross Carrying Amount	4,302.4			4,339.9			4,302.4
Accumulated Amortization, Including Impairments	(2,061.0)			(1,711.7)			(2,061.0)
Net Carrying Amount	2,241.4			2,628.2			2,241.4
Partner relationships
Finite-lived intangible assets:
Gross Carrying Amount	164.6			217.6			164.6
Accumulated Amortization, Including Impairments	(133.0)			(170.3)			(133.0)
Net Carrying Amount	31.6			47.3			31.6
Technology and other
Finite-lived intangible assets:
Gross Carrying Amount	443.1			480.3			443.1
Accumulated Amortization, Including Impairments	(186.2)			(186.1)			(186.2)
Net Carrying Amount	256.9			$ 294.2			256.9
Held-for-sale | Small Business Divestiture
Total intangible assets
Impairment of intangible assets, finite-lived	$ 88.0						88.0
Held-for-sale | Ruconest Divestiture
Total intangible assets
Impairment of intangible assets, finite-lived		$ 199.0					$ 199.0