Proposed Acquisitions (Details) - USD ($) $ / shares in Units, $ in Millions	Jun. 12, 2015	May. 20, 2015	Jun. 30, 2015	Dec. 31, 2014
Business Acquisition [Line Items]
Common stock, par value			$ 0.01	$ 0.01
Omnicare, Inc. [Member]
Business Acquisition [Line Items]
Common stock, par value		$ 1.00
Share price (usd per share)		$ 98.00
Value of shares acquired		$ 10,600
Liabilities incurred		$ 2,300
Purchase price	$ 1,887