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Segment Information Segment Information (Assets by Reportable Segment) (Details) (USD $) In Millions, unless otherwise specified | Dec. 31, 2013 | Jun. 30, 2013
--- | --- | ---
Segment Reporting, Asset Reconciling Item |  |  |
Assets | $ 25,009 |  | $ 25,819
Pharmaceutical |  |  |
Segment Reporting, Asset Reconciling Item |  |  |
Assets | 14,985 | [1] | 16,258
Medical |  |  |
Segment Reporting, Asset Reconciling Item |  |  |
Assets | 6,558 |  | 6,521
Corporate |  |  |
Segment Reporting, Asset Reconciling Item |  |  |
Assets | $ 3,466 |  | $ 3,040
[1] | The decrease in Pharmaceutical segment assets is primarily due to the expiration of our pharmaceutical distribution contract with Walgreens.

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