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Segment Information (Revenue by Reportable Segment) (Details) - USD ($) $ in Millions	12 Months Ended
	Jun. 30, 2022	Jun. 30, 2021	Jun. 30, 2020
Segment Reporting Information [Line Items]
Revenue	$ 181,364	$ 162,467	$ 152,922
Non-US [Member]
Segment Reporting Information [Line Items]
Revenue	4,523	4,727	4,232
United States
Segment Reporting Information [Line Items]
Revenue	176,855	157,756	148,707
Operating Segments
Segment Reporting Information [Line Items]
Revenue	181,378	162,483	152,939
Operating Segments | Pharmaceutical
Segment Reporting Information [Line Items]
Revenue	165,491	145,796	137,495
Operating Segments | Pharmaceutical | Pharmaceutical Distribution and Specialty [Member]
Segment Reporting Information [Line Items]
Revenue	164,580	144,988	136,693
Operating Segments | Pharmaceutical | Nuclear Precision Health Services [Member]
Segment Reporting Information [Line Items]
Revenue	911	808	802
Operating Segments | Medical
Segment Reporting Information [Line Items]
Revenue	15,887	16,687	15,444
Operating Segments | Medical | Medical distribution and products [Member]
Segment Reporting Information [Line Items]
Revenue	13,462	14,485	13,429
Operating Segments | Medical | Cardinal Health At Home Solutions [Member]
Segment Reporting Information [Line Items]
Revenue	2,425	2,202	2,015
Corporate
Segment Reporting Information [Line Items]
Revenue	$ (14)	$ (16)	$ (17)

X

- Definition

Amount of revenue recognized from goods sold, services rendered, insurance premiums, or other activities that constitute an earning process. Includes, but is not limited to, investment and interest income before deduction of interest expense when recognized as a component of revenue, and sales and trading gain (loss).

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