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Segment Information (Revenue by Reportable Segment) (Details) (USD $)
In Millions, unless otherwise specified
 3 Months Ended 6 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2013
Dec. 31, 2012
Segment Reporting Information        
Revenue $ 22,240 $ 25,232 $ 46,763 $ 51,121
Pharmaceutical
        
Segment Reporting Information        
Revenue 19,443 [1] 22,747 41,256 [1] 46,244
Medical
        
Segment Reporting Information        
Revenue 2,799 2,487 5,511 4,879
Reportable Segments
        
Segment Reporting Information        
Revenue 22,242 25,234 46,767 51,123
Corporate
        
Segment Reporting Information        
Revenue $ (2) [2] $ (2) [2] $ (4) [2] $ (2) [2]
[1] The decrease in Pharmaceutical segment revenue is primarily due to the expiration of our pharmaceutical distribution contract with Walgreens.
[2] Corporate revenue consists of the elimination of inter-segment revenue.