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Segment Information (Revenue by Reportable Segment) (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Mar. 31, 2019 | Mar. 31, 2018 | Mar. 31, 2019 | Mar. 31, 2018
Segment Reporting Information [Line Items] |  |  |  |
Total revenue | $ 35,228 | $ 33,633 | $ 108,181 | $ 101,460
Operating Segments |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Total revenue | 35,232 | 33,636 | 108,194 | 101,470
Operating Segments | Pharmaceutical |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Total revenue | 31,361 | 29,720 | 96,516 | 89,786
Operating Segments | Medical |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Total revenue | 3,871 | 3,916 | 11,678 | 11,684
Corporate |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Total revenue | (4) | $ (3) | (13) | $ (10)
Pharmaceutical distribution and specialty [Member] | Operating Segments | Pharmaceutical |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Total revenue | 31,146 |  | 95,888 |
Nuclear Precision Health Services [Member] | Operating Segments | Pharmaceutical |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Total revenue | 215 |  | 628 |
Medical distribution and products [Member] | Operating Segments | Medical |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Total revenue | 3,431 |  | 10,339 |
Cardinal Health At Home [Member] | Operating Segments | Medical |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Total revenue | $ 440 |  | $ 1,339 |

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