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Segment Information (Revenue by Reportable Segment) (Details) - USD ($) $ in Millions | 3 Months Ended
--- | ---
Sep. 30, 2018 | Sep. 30, 2017
Segment Reporting Information [Line Items] |  |
Total revenue | $ 35,213 | $ 32,641
Operating Segments |  |
Segment Reporting Information [Line Items] |  |
Total revenue | 39,018 | 32,644
Operating Segments | Pharmaceutical |  |
Segment Reporting Information [Line Items] |  |
Total revenue | 31,416 | 28,920
Operating Segments | Medical |  |
Segment Reporting Information [Line Items] |  |
Total revenue | 3,801 | 3,724
Corporate |  |
Segment Reporting Information [Line Items] |  |
Total revenue | (4) | $ (3)
Nuclear Precision Health Services [Member] | Operating Segments | Pharmaceutical |  |
Segment Reporting Information [Line Items] |  |
Total revenue | 207 |
Pharmaceutical distribution and specialty [Member] | Operating Segments | Pharmaceutical |  |
Segment Reporting Information [Line Items] |  |
Total revenue | 31,209 |
Medical distribution and products [Member] | Operating Segments | Medical |  |
Segment Reporting Information [Line Items] |  |
Total revenue | 3,380 |
Cardinal Health At Home [Member] | Operating Segments | Medical |  |
Segment Reporting Information [Line Items] |  |
Total revenue | $ 421 |

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