Borrowings and Capital Lease (Narrative) (Details) - USD ($)	6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Dec. 31, 2016	Nov. 02, 2015	Dec. 12, 2014
Line of Credit Facility [Line Items]
Repayment of lines of credit	$ 3,527,900,000	$ 1,500,300,000
Capital lease obligation	350,600,000
November 2015 Facilities Agreement
Line of Credit Facility [Line Items]
Facility amount outstanding	3,300,000,000
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	1,700,000,000
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	55,300,000
Revolving Credit Facility
Line of Credit Facility [Line Items]
Borrowings under the Facilities Agreement	735,000,000		$ 450,000,000
Baxalta
Line of Credit Facility [Line Items]
Aggregate amount	$ 5,000,000,000