Acquisitions (Narrative) (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended			0 Months Ended	3 Months Ended		0 Months Ended			12 Months Ended
	Jun. 30, 2013	Jun. 30, 2012	Jun. 30, 2011	Mar. 18, 2013 AssuraMed	Jun. 30, 2013 AssuraMed	Feb. 22, 2013 AssuraMed Total of 1.7%, 3.2% and 4.6% Notes due 2018, 2023 and 2043	Dec. 21, 2010 Kinray	Nov. 29, 2010 Cardinal Health China	Jul. 15, 2010 P4 Healthcare	Jun. 30, 2013 P4 Healthcare	Jun. 30, 2012 P4 Healthcare	Jun. 30, 2011 P4 Healthcare
Business Acquisition
Business Acquisition, Effective Date of Acquisition				Mar. 18, 2013			Dec. 21, 2010	Nov. 29, 2010	Jul. 15, 2010
Business Acquisition, Cost of Acquired Entity, Purchase Price				$ 2,070				$ 458
Debt Instrument, Face Amount						1,300
Business Combination, Acquisition Related Costs					20
Discount Rate					9.50%
Business Acquisition, Cost of Acquired Entity, Cash Paid							1,300		506
Goodwill					1,402		984	240	368
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Intangibles					627		133	56	226
Business Acquisition, Purchase Price Allocation, Notes Payable and Long-term Debt								57
Business Acquisition, Contingent Consideration, Potential Cash Payment									100
Payment Of Contingent Consideration	4	0	10							4		10
Business Combination, Contingent Consideration Arrangements, Change in Amount of Contingent Consideration, Liability	$ 0	$ 71	$ 7								$ 71