Intangible Assets (Details) - USD ($) $ in Millions			6 Months Ended
	Jun. 03, 2016	Jan. 22, 2016	Jun. 30, 2016	Jun. 30, 2015	Dec. 31, 2015	Dec. 31, 2014
Intangible Assets (Excluding Goodwill) [Line Items]
Gross other intangible assets			$ 43,173.5		$ 11,108.9
Less: Accumulated amortization			(2,283.2)		(1,935.6)
Other intangible assets, net			40,890.3	$ 9,310.4	9,173.3	$ 4,934.4
Other Disclosures
Acquisitions			32,222.2	$ 5,167.8
Estimates of Annual Amortization
2016 (remaining six months)			706.1
2017			1,411.3
2018			1,404.6
2019			1,325.8
2020			1,321.7
2021			1,315.4
IP rights for marketed products
Intangible Assets (Excluding Goodwill) [Line Items]
Gross other intangible assets			33,929.5		9,371.9
Less: Accumulated amortization			(2,142.8)		(1,852.1)
Other intangible assets, net			31,786.7		7,519.8
IP rights for marketed products | Baxalta
Other Disclosures
Acquisitions	$ 24,550.0
IP rights for marketed products | Dyax
Other Disclosures
Acquisitions		$ 135.0
IP rights for in-process research and development unamortized
Intangible Assets (Excluding Goodwill) [Line Items]
Gross other intangible assets			8,371.8		1,362.0
Less: Accumulated amortization			0.0		0.0
Other intangible assets, net			8,371.8		1,362.0
Other intangible assets
Intangible Assets (Excluding Goodwill) [Line Items]
Gross other intangible assets			872.2		375.0
Less: Accumulated amortization			(140.4)		(83.5)
Other intangible assets, net			$ 731.8		$ 291.5
Acquired IP rights for in-process research and development ("IPR&D") | Baxalta
Other Disclosures
Acquisitions	2,940.0
Acquired IP rights for in-process research and development ("IPR&D") | Dyax
Other Disclosures
Acquisitions		4,100.0
Royalty rights | Dyax
Other Disclosures
Acquisitions		$ 425.0
Contract based arrangements | Baxalta
Other Disclosures
Acquisitions	$ 72.2