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Segment Information (Revenue by Reportable Segment) (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Mar. 31, 2021 | Mar. 31, 2020 | Mar. 31, 2021 | Mar. 31, 2020
Segment Reporting Information [Line Items] |  |  |  |
Total revenue | $ 39,275 | $ 39,157 | $ 119,881 | $ 116,233
Operating Segments |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Total revenue | 39,278 | 39,163 | 119,893 | 116,245
Operating Segments | Pharmaceutical |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Total revenue | 35,104 | 35,112 | 107,452 | 104,254
Operating Segments | Medical |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Total revenue | 4,174 | 4,051 | 12,441 | 11,991
Corporate |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Total revenue | (3) | (6) | (12) | (12)
Pharmaceutical Distribution and Specialty [Member] | Operating Segments | Pharmaceutical |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Total revenue | 34,903 | 34,899 | 106,859 | 103,612
Nuclear Precision Health Services [Member] | Operating Segments | Pharmaceutical |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Total revenue | 201 | 213 | 593 | 642
Medical distribution and products [Member] | Operating Segments | Medical |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Total revenue | 3,638 | 3,539 | 10,805 | 10,483
Cardinal Health At Home [Member] | Operating Segments | Medical |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Total revenue | $ 536 | $ 512 | $ 1,636 | $ 1,508

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