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Segment Information (Revenue by Reportable Segment) (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2018 | Dec. 31, 2017
Segment Reporting Information [Line Items] |  |  |  |
Total revenue | $ 37,740 | $ 35,186 | $ 72,953 | $ 67,827
Operating Segments |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Total revenue | 37,746 | 35,190 | 72,962 | 67,834
Operating Segments | Pharmaceutical |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Total revenue | 33,740 | 31,146 | 65,155 | 60,066
Operating Segments | Medical |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Total revenue | 4,006 | 4,044 | 7,807 | 7,768
Corporate |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Total revenue | (6) | $ (4) | (9) | $ (7)
Pharmaceutical distribution and specialty [Member] | Operating Segments | Pharmaceutical |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Total revenue | 33,534 |  | 64,742 |
Nuclear Precision Health Services [Member] | Operating Segments | Pharmaceutical |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Total revenue | 206 |  | 413 |
Medical distribution and products [Member] | Operating Segments | Medical |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Total revenue | 3,527 |  | 6,907 |
Cardinal Health At Home [Member] | Operating Segments | Medical |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Total revenue | $ 479 |  | $ 900 |

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