Intangible Assets (Narrative) (Details) - USD ($) $ in Millions			9 Months Ended
	Jun. 03, 2016	Jan. 22, 2016	Sep. 30, 2016	Sep. 30, 2015
Finite-Lived Intangible Assets [Line Items]
Acquisitions			$ 30,377.7	$ 5,473.7
Baxalta | Currently marketed products
Finite-Lived Intangible Assets [Line Items]
Acquisitions	$ 24,150.0
Baxalta | In-Process Research and Development (IPR&D)
Finite-Lived Intangible Assets [Line Items]
Acquisitions	1,480.0
Baxalta | Contract based arrangements
Finite-Lived Intangible Assets [Line Items]
Acquisitions	$ 82.2
Dyax | Currently marketed products
Finite-Lived Intangible Assets [Line Items]
Acquisitions		$ 135.0
Dyax | In-Process Research and Development (IPR&D)
Finite-Lived Intangible Assets [Line Items]
Acquisitions		4,100.0
Dyax | Royalty rights
Finite-Lived Intangible Assets [Line Items]
Acquisitions		$ 425.0