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Segment Information (Revenue by Reportable Segment) (Details) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2020
Dec. 31, 2019
Segment Reporting Information [Line Items]        
Total revenue $ 41,541 $ 39,735 $ 80,606 $ 77,076
Operating Segments        
Segment Reporting Information [Line Items]        
Total revenue 41,546 39,737 80,615 77,082
Operating Segments | Pharmaceutical        
Segment Reporting Information [Line Items]        
Total revenue 37,236 35,714 72,348 69,142
Operating Segments | Medical        
Segment Reporting Information [Line Items]        
Total revenue 4,310 4,023 8,267 7,940
Corporate        
Segment Reporting Information [Line Items]        
Total revenue (5) (2) (9) (6)
Pharmaceutical Distribution and Specialty [Member] | Operating Segments | Pharmaceutical        
Segment Reporting Information [Line Items]        
Total revenue 37,040 35,501 71,956 68,713
Nuclear Precision Health Services [Member] | Operating Segments | Pharmaceutical        
Segment Reporting Information [Line Items]        
Total revenue 196 213 392 429
Medical distribution and products [Member] | Operating Segments | Medical        
Segment Reporting Information [Line Items]        
Total revenue 3,729 3,498 7,167 6,944
Cardinal Health At Home [Member] | Operating Segments | Medical        
Segment Reporting Information [Line Items]        
Total revenue $ 581 $ 525 $ 1,100 $ 996