Share-based Compensation Plans (Share-based Compensation Expense) (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Share-based compensation expense	$ 176.5	$ 28.9	$ 194.8	$ 44.3
Less tax	(41.5)	(7.9)	(46.3)	(12.0)
Share-based compensation expense, net	135.0	21.0	148.5	32.3
Baxalta Incorporated [Member]
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Share-based compensation expense	146.3		146.3
Cost of Product Sales
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Share-based compensation expense	4.5	1.9	7.6	4.7
Research and Development
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Share-based compensation expense	13.6	9.1	25.2	17.6
Selling, General and Administrative
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Share-based compensation expense	14.4	10.9	23.6	13.3
Integration and acquisition costs [Member]
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Share-based compensation expense	144.0	0.0	138.4	0.0
Reorganization costs
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Share-based compensation expense	$ 0.0	$ 7.0	$ 0.0	$ 8.7