Segment Information (Revenue by Reportable Segment) (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Mar. 31, 2025	Mar. 31, 2024	Mar. 31, 2025	Mar. 31, 2024
Segment Reporting Information [Line Items]
Total revenue	$ 54,878	$ 54,868	$ 162,419	$ 166,960
Operating Segments
Segment Reporting Information [Line Items]
Total revenue	54,897	54,889	162,482	167,024
Operating Segments | Pharmaceutical and Specialty Solutions
Segment Reporting Information [Line Items]
Total revenue	50,433	50,622	149,272	154,412
Operating Segments | Global Medical Products and Distribution
Segment Reporting Information [Line Items]
Total revenue	3,160	3,113	9,437	9,272
Operating Segments | Other Segments
Segment Reporting Information [Line Items]
Total revenue	1,304	1,154	3,773	3,340
Corporate
Segment Reporting Information [Line Items]
Total revenue	(19)	(21)	(63)	(64)
Nuclear Precision Health Services [Member] | Operating Segments | Other Segments
Segment Reporting Information [Line Items]
Total revenue	403	352	1,148	1,006
OptiFreight Logistics [Member] | Operating Segments | Other Segments
Segment Reporting Information [Line Items]
Total revenue	84	72	234	198
at-Home Solutions [Member] | Operating Segments | Other Segments
Segment Reporting Information [Line Items]
Total revenue	$ 817	$ 730	$ 2,391	$ 2,136