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Segment Information (Revenue by Reportable Segment) (Details) (USD $)
In Millions, unless otherwise specified
 3 Months Ended 9 Months Ended
Mar. 31, 2014
Mar. 31, 2013
Mar. 31, 2014
Mar. 31, 2013
Segment Reporting Information        
Revenue $ 21,427 $ 24,552 $ 68,190 $ 75,673
Pharmaceutical
        
Segment Reporting Information        
Revenue 18,762 [1] 22,070 60,018 [1] 68,314
Medical
        
Segment Reporting Information        
Revenue 2,657 2,484 8,168 7,363
Reportable Segments
        
Segment Reporting Information        
Revenue 21,419 24,554 68,186 75,677
Corporate
        
Segment Reporting Information        
Revenue $ 8 [2] $ (2) [2] $ 4 [2] $ (4) [2]
[1] The decrease in Pharmaceutical segment revenue is primarily due to the Walgreens contract expiration.
[2] Corporate revenue consists of the elimination of inter-segment revenue and other revenue not allocated to the segments.