Segment Information (Revenue by Reportable Segment) (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Mar. 31, 2023	Mar. 31, 2022	Mar. 31, 2023	Mar. 31, 2022
Segment Reporting Information [Line Items]
Total revenue	$ 50,487	$ 44,836	$ 151,559	$ 134,261
Operating Segments
Segment Reporting Information [Line Items]
Total revenue	50,493	44,841	151,569	134,272
Operating Segments | Pharmaceutical
Segment Reporting Information [Line Items]
Total revenue	46,809	40,957	140,310	122,154
Operating Segments | Medical
Segment Reporting Information [Line Items]
Total revenue	3,684	3,884	11,259	12,118
Corporate
Segment Reporting Information [Line Items]
Total revenue	(6)	(5)	(10)	(11)
Pharmaceutical Distribution and Specialty [Member] | Operating Segments | Pharmaceutical
Segment Reporting Information [Line Items]
Total revenue	46,497	40,723	139,435	121,501
Nuclear Precision Health Services [Member] | Operating Segments | Pharmaceutical
Segment Reporting Information [Line Items]
Total revenue	312	234	875	653
Medical distribution and products [Member] | Operating Segments | Medical
Segment Reporting Information [Line Items]
Total revenue	3,034	3,283	9,273	10,296
Cardinal Health At Home [Member] | Operating Segments | Medical
Segment Reporting Information [Line Items]
Total revenue	$ 650	$ 601	$ 1,986	$ 1,822