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Segment Information (Revenue by Reportable Segment) (Details) (USD $)
In Millions, unless otherwise specified
 3 Months Ended
Sep. 30, 2014
Sep. 30, 2013
Segment Reporting Information    
Revenue $ 24,070 $ 24,523
Pharmaceutical
    
Segment Reporting Information    
Revenue 21,209 [1] 21,813 [1]
Medical
    
Segment Reporting Information    
Revenue 2,852 2,711
Reportable Segments
    
Segment Reporting Information    
Revenue 24,061 24,524
Corporate
    
Segment Reporting Information    
Revenue $ 9 [2] $ (1) [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.