Borrowings and Capital Lease (Narrative) (Details) - USD ($)	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016	Dec. 31, 2016	Sep. 23, 2016	Dec. 12, 2014
Line of Credit Facility [Line Items]
Repayment of lines of credit	$ 1,825,700,000	$ 995,100,000
Capital lease obligation	351,900,000
November 2015 Facilities Agreement
Line of Credit Facility [Line Items]
Facility amount outstanding	4,000,000,000
November 2015 Facility B | November 2015 Facilities Agreement
Line of Credit Facility [Line Items]
Facility amount outstanding	5,600,000,000
Repayment of lines of credit	1,000,000,000
Revolving Credit Facility
Line of Credit Facility [Line Items]
Aggregate amount					$ 2,100,000,000.0
Swingline Facility					$ 250,000,000
Shire Acquisitions Investment Ireland Designated Activity Company | Senior Notes
Line of Credit Facility [Line Items]
Aggregate amount	12,100,000,000
Deferred financing costs				$ 57,900,000
Revolving Credit Facility
Line of Credit Facility [Line Items]
Borrowings under the Facilities Agreement	1,030,000,000		$ 450,000,000
Baxalta
Line of Credit Facility [Line Items]
Aggregate amount	$ 5,000,000,000