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Segment Information (Revenue by Reportable Segment) (Details) - USD ($) $ in Millions	3 Months Ended
	Sep. 30, 2020	Sep. 30, 2019
Segment Reporting Information [Line Items]
Total revenue	$ 39,065	$ 37,341
Operating Segments
Segment Reporting Information [Line Items]
Total revenue	39,069	37,345
Operating Segments | Pharmaceutical
Segment Reporting Information [Line Items]
Total revenue	35,112	33,428
Operating Segments | Medical
Segment Reporting Information [Line Items]
Total revenue	3,957	3,917
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	196	216
Pharmaceutical Distribution and Specialty [Member] | Operating Segments | Pharmaceutical
Segment Reporting Information [Line Items]
Total revenue	34,916	33,212
Medical distribution and products [Member] | Operating Segments | Medical
Segment Reporting Information [Line Items]
Total revenue	3,438	3,446
Cardinal Health At Home Solutions [Member] | Operating Segments | Medical
Segment Reporting Information [Line Items]
Total revenue	$ 519	$ 471

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