Segment Information (Revenue by Reportable Segment) (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended				9 Months Ended
	Mar. 31, 2015		Mar. 31, 2014		Mar. 31, 2015		Mar. 31, 2014
Segment Reporting Information
Revenue	$ 25,375		$ 21,427		$ 74,983		$ 68,190
Pharmaceutical
Segment Reporting Information
Revenue	22,605		18,762		66,440	[1]	60,018	[1]
Medical
Segment Reporting Information
Revenue	2,774		2,657		8,540		8,168
Reportable Segments
Segment Reporting Information
Revenue	25,379		21,419		74,980		68,186
Corporate
Segment Reporting Information
Revenue	$ (4)	[2]	$ 8	[2]	$ 3	[2]	$ 4	[2]
Walgreen Co | Pharmaceutical
Segment Reporting Information
Contract expiration date			Aug. 31, 2013

[1] Our pharmaceutical distribution contract with Walgreen Co. expired on August 31, 2013.

[2] Corporate revenue consists of the elimination of inter-segment revenue and other revenue not allocated to the segments.