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Segment Information (Revenue by Reportable Segment) (Details) - USD ($) $ in Millions | 3 Months Ended
--- | ---
Sep. 30, 2019 | Sep. 30, 2018
Segment Reporting Information [Line Items] |  |
Total revenue | $ 37,341 | $ 35,213
Operating Segments |  |
Segment Reporting Information [Line Items] |  |
Total revenue | 37,345 | 35,217
Operating Segments | Pharmaceutical |  |
Segment Reporting Information [Line Items] |  |
Total revenue | 33,428 | 31,416
Operating Segments | Medical |  |
Segment Reporting Information [Line Items] |  |
Total revenue | 3,917 | 3,801
Corporate |  |
Segment Reporting Information [Line Items] |  |
Total revenue | (4) | (4)
Nuclear Precision Health Services [Member] | Operating Segments | Pharmaceutical |  |
Segment Reporting Information [Line Items] |  |
Total revenue | 216 | 207
Pharmaceutical Distribution and Specialty [Member] | Operating Segments | Pharmaceutical |  |
Segment Reporting Information [Line Items] |  |
Total revenue | 33,212 | 31,209
Medical distribution and products [Member] | Operating Segments | Medical |  |
Segment Reporting Information [Line Items] |  |
Total revenue | 3,446 | 3,380
Cardinal Health At Home [Member] | Operating Segments | Medical |  |
Segment Reporting Information [Line Items] |  |
Total revenue | $ 471 | $ 421

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