Acquisitions Acquisitions (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended							1 Months Ended	12 Months Ended
	Jun. 30, 2012		Jun. 30, 2011		Jun. 30, 2010	Dec. 21, 2010 Kinray	Nov. 29, 2010 Cardinal Health China	Jul. 31, 2012 P4 Healthcare	Jun. 30, 2012 P4 Healthcare	Jun. 30, 2011 P4 Healthcare	Jul. 13, 2011 P4 Healthcare	Jul. 15, 2010 P4 Healthcare
Business Acquisition [Line Items]
Business Acquisition, Cost of Acquired Entity, Cash Paid						$ 1,300						$ 506
Business Acquisition, Purchase Price Allocation, Goodwill Amount						984	240					368
Business Acquisition, Purchase Price Allocation, Amortizable Intangible Assets						133	56					226
Business Acquisition, Cost of Acquired Entity, Purchase Price							458
Business Acquisition, Purchase Price Allocation, Notes Payable and Long-term Debt							57
Business Acquisition, Contingent Consideration, Potential Cash Payment											100
Payment Of Contingent Consideration	0		10		0			4		10
Business Combination, Contingent Consideration Arrangements, Change in Amount of Contingent Consideration, Liability									71
Business Acquisition, Contingent Consideration, at Fair Value	$ 4	[1]	$ 75	[1]					$ 4

[1] The contingent consideration obligation was incurred in connection with the acquisition of P4 Healthcare. See Note 2 for additional information regarding the contingent consideration obligation related to the P4 Healthcare acquisition including an explanation of the reduction in the estimated fair value during fiscal 2012. The fair value of the contingent consideration obligation was determined based on a probability-weighted income approach derived from EBITDA estimates and probability assessments with respect to the likelihood of achieving the various EBITDA targets. The fair value measurement was based on significant inputs unobservable in the market and thus represents a Level 3 measurement. At each reporting date, we revalued the contingent consideration obligation to estimated fair value. Changes in the fair value of the contingent consideration obligation resulted from changes in the terms of the contingent payments, changes in discount periods and rates, changes in the timing and amount of EBITDA estimates, and changes in probability assumptions with respect to the timing and likelihood of achieving the EBITDA targets. As a result of changes in our estimate of performance in future periods due in large part to the loss of revenue from a significant customer of the P4 Healthcare legacy business in fiscal 2012, we revised the timing and amount of EBITDA estimates and made changes in probability assumptions with respect to the likelihood of achieving the EBITDA targets.