Retirement and Other Benefit Programs (Summary of Amounts Recorded in AOCI) (Details) $ in Millions	12 Months Ended
	Dec. 31, 2016 USD ($)
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Gain arising during the year, tax expense	$ 3.8
Baxalta | U.S. pensions
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Gain (loss) arising during the year, net of tax expense of $30.9 million for U.S. plans and $3.8 million for international plans	52.5
Reclassification of gain to income statement, net of tax benefit of $25.9 million for U.S. plans	(43.5)
Pension and other employee benefits gain (loss), net of tax	9.0
Gain arising during the year, tax expense	30.9
Reclassification of gain to income statement, tax benefit	25.9
Baxalta | International pensions
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Gain (loss) arising during the year, net of tax expense of $30.9 million for U.S. plans and $3.8 million for international plans	(14.2)
Reclassification of gain to income statement, net of tax benefit of $25.9 million for U.S. plans	0.0
Pension and other employee benefits gain (loss), net of tax	(14.2)
Baxalta | OPEB
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Gain (loss) arising during the year, net of tax expense of $30.9 million for U.S. plans and $3.8 million for international plans	0.0
Reclassification of gain to income statement, net of tax benefit of $25.9 million for U.S. plans	0.0
Pension and other employee benefits gain (loss), net of tax	$ 0.0