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Segment Information (Assets by Reportable Segment) (Details) - USD ($) $ in Millions | Mar. 31, 2018 | Jun. 30, 2017
--- | --- | ---
Segment Reporting Information [Line Items] |  |
Total assets | $ 41,031 | $ 40,112
Operating Segments | Pharmaceutical |  |
Segment Reporting Information [Line Items] |  |
Total assets | 20,573 | 21,848
Operating Segments | Medical |  |
Segment Reporting Information [Line Items] |  |
Total assets | 17,746 | 10,688
Corporate |  |
Segment Reporting Information [Line Items] |  |
Total assets | $ 2,712 | $ 7,576

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