Segment Information (Revenue by Reportable Segment) (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2023	Dec. 31, 2022
Segment Reporting Information [Line Items]
Total revenue	$ 57,445	$ 51,469	$ 112,208	$ 101,072
Operating Segments
Segment Reporting Information [Line Items]
Total revenue	57,448	51,470	112,214	101,076
Operating Segments | Pharmaceutical
Segment Reporting Information [Line Items]
Total revenue	53,520	47,673	104,526	93,501
Operating Segments | Medical
Segment Reporting Information [Line Items]
Total revenue	3,928	3,797	7,688	7,575
Corporate
Segment Reporting Information [Line Items]
Total revenue	(3)	(1)	(6)	(4)
Pharmaceutical Distribution and Specialty [Member] | Operating Segments | Pharmaceutical
Segment Reporting Information [Line Items]
Total revenue	53,190	47,391	103,872	92,938
Nuclear Precision Health Services [Member] | Operating Segments | Pharmaceutical
Segment Reporting Information [Line Items]
Total revenue	330	282	654	563
Medical distribution and products [Member] | Operating Segments | Medical
Segment Reporting Information [Line Items]
Total revenue	3,167	3,099	6,243	6,239
Cardinal Health At Home [Member] | Operating Segments | Medical
Segment Reporting Information [Line Items]
Total revenue	$ 761	$ 698	$ 1,445	$ 1,336