Segment Information (Revenue by Reportable Segment) (Details) - USD ($) $ in Millions	12 Months Ended
	Jun. 30, 2023	Jun. 30, 2022	Jun. 30, 2021
Segment Reporting Information [Line Items]
Revenue	$ 205,012	$ 181,364	$ 162,467
Non-US [Member]
Segment Reporting Information [Line Items]
Revenue	4,639	4,523	4,727
United States
Segment Reporting Information [Line Items]
Revenue	200,384	176,855	157,756
Operating Segments
Segment Reporting Information [Line Items]
Revenue	205,023	181,378	162,483
Operating Segments | Pharmaceutical
Segment Reporting Information [Line Items]
Revenue	190,009	165,491	145,796
Operating Segments | Pharmaceutical | Pharmaceutical Distribution and Specialty [Member]
Segment Reporting Information [Line Items]
Revenue	188,812	164,580	144,988
Operating Segments | Pharmaceutical | Nuclear Precision Health Services [Member]
Segment Reporting Information [Line Items]
Revenue	1,197	911	808
Operating Segments | Medical
Segment Reporting Information [Line Items]
Revenue	15,014	15,887	16,687
Operating Segments | Medical | Medical distribution and products [Member]
Segment Reporting Information [Line Items]
Revenue	12,374	13,462	14,485
Operating Segments | Medical | Cardinal Health At Home Solutions [Member]
Segment Reporting Information [Line Items]
Revenue	2,640	2,425	2,202
Corporate
Segment Reporting Information [Line Items]
Revenue	$ (11)	$ (14)	$ (16)