Segment Information (Revenue by Reportable Segment) (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Mar. 31, 2022	Mar. 31, 2021	Mar. 31, 2022	Mar. 31, 2021
Segment Reporting Information [Line Items]
Total revenue	$ 44,836	$ 39,275	$ 134,261	$ 119,881
Operating Segments
Segment Reporting Information [Line Items]
Total revenue	44,841	39,278	134,272	119,893
Operating Segments | Pharmaceutical
Segment Reporting Information [Line Items]
Total revenue	40,957	35,104	122,154	107,452
Operating Segments | Medical
Segment Reporting Information [Line Items]
Total revenue	3,884	4,174	12,118	12,441
Corporate
Segment Reporting Information [Line Items]
Total revenue	(5)	(3)	(11)	(12)
Pharmaceutical Distribution and Specialty [Member] | Operating Segments | Pharmaceutical
Segment Reporting Information [Line Items]
Total revenue	40,723	34,903	121,501	106,859
Nuclear Precision Health Services [Member] | Operating Segments | Pharmaceutical
Segment Reporting Information [Line Items]
Total revenue	234	201	653	593
Medical distribution and products [Member] | Operating Segments | Medical
Segment Reporting Information [Line Items]
Total revenue	3,283	3,638	10,296	10,805
Cardinal Health At Home [Member] | Operating Segments | Medical
Segment Reporting Information [Line Items]
Total revenue	$ 601	$ 536	$ 1,822	$ 1,636