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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.

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