Segment Information (Revenue by Reportable Segment) (Details) - USD ($) $ in Millions		3 Months Ended								12 Months Ended
		Jun. 30, 2015	Mar. 31, 2015	Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2013	Sep. 30, 2013	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2013
Segment Reporting Information [Line Items]
Revenue		$ 27,547	$ 25,375	$ 25,537	$ 24,070	$ 22,894	$ 21,427	$ 22,240	$ 24,523	$ 102,531	$ 91,084	$ 101,093
Pharmaceutical
Segment Reporting Information [Line Items]
Revenue	[1]									91,116	80,110	91,097
Medical
Segment Reporting Information [Line Items]
Revenue										11,395	10,962	10,060
Reportable Segments
Segment Reporting Information [Line Items]
Revenue										102,511	91,072	101,157
Corporate
Segment Reporting Information [Line Items]
Revenue	[2]									$ 20	$ 12	$ (64)

[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.