Basis of Presentation and Summary of Significant Accounting Policies (Narrative) (Details) (USD $) In Millions, except Per Share data, unless otherwise specified	12 Months Ended									12 Months Ended		12 Months Ended																			12 Months Ended
	Jun. 30, 2012 Segments		Jun. 30, 2011		Jun. 30, 2010		Aug. 31, 2009	Jun. 30, 2009		Jun. 30, 2012 Express Scripts, Inc. Pharmaceutical	Sep. 30, 2012 Express Scripts, Inc. Pharmaceutical	Jun. 30, 2012 GPO Members	Jun. 30, 2011 GPO Members	Jun. 30, 2010 GPO Members	Jun. 30, 2012 Allowance for Trade Receivables		Jun. 30, 2011 Allowance for Trade Receivables		Jun. 30, 2010 Allowance for Trade Receivables		Jun. 30, 2009 Allowance for Trade Receivables		Jun. 30, 2012 Allowance for Notes Receivable		Jun. 30, 2011 Allowance for Notes Receivable		Jun. 30, 2010 Allowance for Notes Receivable		Jun. 30, 2009 Allowance for Notes Receivable		Jun. 30, 2012 CareFusion	Jun. 30, 2011 CareFusion	Jun. 30, 2010 CareFusion	Jun. 30, 2012 Minimum	Jun. 30, 2012 Minimum Buildings and Improvements	Jun. 30, 2012 Minimum Machinery and Equipment	Jun. 30, 2012 Minimum Furniture and Fixtures	Jun. 30, 2012 Maximum	Jun. 30, 2012 Maximum Buildings and Improvements	Jun. 30, 2012 Maximum Machinery and Equipment	Jun. 30, 2012 Maximum Furniture and Fixtures
Percentage distribution of CareFusion stock to Cardinal Health shareholders							81.00%
CareFusion shares retained by Cardinal Health							41
Number of shares of stock disposed			30		11
Amount of transition service fee income																															$ 3	$ 65	$ 99
Indemnification receivable																															265	264
Amount of trade receivables purchased																																460	606
Valuation Allowances and Reserves, Ending Balance	143	[1]	150	[1]	140	[1]		118	[1]						126	[1]	134	[1]	123	[1]	103	[1]	16	[1]	15	[1]	16	[1]	14	[1]
Receivable financing agreement																																		90 days				10 years
Finance notes and accrued interest receivables	84		90
Current portion of finance notes and accrued interest receivables	33		19
Percent of revenue												13.00%	14.00%	15.00%																				10.00%
Contract expiration date											Sep. 30, 2012
Total revenue by customer										9,000
Inventories valued at the lower of cost, using the LIFO method, or market	69.00%		70.00%
Inventory LIFO value over average cost	72		8
Reserves for excess and obsolete inventory	37		40
Property, Plant and Equipment, Useful Life																																			3 years	3 years	3 years		39 years	20 years	7 years
Depreciation expense	241		244		233
Capitalized interest percentage	4.49%
Number of Operating Segments	2
Probability of realizing tax benefit																																		50.00%
Vendor reserves	55		41
Cash dividends per Common Share	$ 0.86		$ 0.78		$ 0.70
Sales returns and allowances	1,800		1,700		1,500
Shipping and handling costs	360		326		294
Foreign currency translation gains/(losses)	$ 37		$ 71

[1] (3)Amounts included herein pertain to the continuing operations of the Company.