Segment Information (Revenue by Reportable Segment) (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2021	Dec. 31, 2020
Segment Reporting Information [Line Items]
Total revenue	$ 45,457	$ 41,541	$ 89,425	$ 80,606
Operating Segments
Segment Reporting Information [Line Items]
Total revenue	45,460	41,546	89,431	80,615
Operating Segments | Pharmaceutical
Segment Reporting Information [Line Items]
Total revenue	41,375	37,236	81,197	72,348
Operating Segments | Medical
Segment Reporting Information [Line Items]
Total revenue	4,085	4,310	8,234	8,267
Corporate
Segment Reporting Information [Line Items]
Total revenue	(3)	(5)	(6)	(9)
Pharmaceutical Distribution and Specialty [Member] | Operating Segments | Pharmaceutical
Segment Reporting Information [Line Items]
Total revenue	41,164	37,040	80,778	71,956
Nuclear Precision Health Services [Member] | Operating Segments | Pharmaceutical
Segment Reporting Information [Line Items]
Total revenue	211	196	419	392
Medical distribution and products [Member] | Operating Segments | Medical
Segment Reporting Information [Line Items]
Total revenue	3,446	3,729	7,013	7,167
Cardinal Health At Home [Member] | Operating Segments | Medical
Segment Reporting Information [Line Items]
Total revenue	$ 639	$ 581	$ 1,221	$ 1,100