Segment Information (Revenue by Reportable Segment) (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended				6 Months Ended
	Dec. 31, 2014		Dec. 31, 2013		Dec. 31, 2014		Dec. 31, 2013
Segment Reporting Information
Revenue	$ 25,537		$ 22,240		$ 49,607		$ 46,763
Pharmaceutical
Segment Reporting Information
Revenue	22,627		19,443		43,836	[1]	41,256	[1]
Medical
Segment Reporting Information
Revenue	2,914		2,799		5,766		5,511
Reportable Segments
Segment Reporting Information
Revenue	25,541		22,242		49,602		46,767
Corporate
Segment Reporting Information
Revenue	$ (4)	[2]	$ (2)	[2]	$ 5	[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.