Segment Information (Revenue by Reportable Segment) (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2024	Dec. 31, 2023
Segment Reporting Information [Line Items]
Total revenue	$ 55,264	$ 57,442	$ 107,541	$ 112,092
Operating Segments
Segment Reporting Information [Line Items]
Total revenue	55,286	57,464	107,585	112,135
Operating Segments | Pharmaceutical and Specialty Solutions
Segment Reporting Information [Line Items]
Total revenue	50,849	53,202	98,839	103,790
Operating Segments | Global Medical Products and Distribution
Segment Reporting Information [Line Items]
Total revenue	3,154	3,127	6,277	6,159
Operating Segments | Other Segments
Segment Reporting Information [Line Items]
Total revenue	1,283	1,135	2,469	2,186
Corporate
Segment Reporting Information [Line Items]
Total revenue	(22)	(22)	(44)	(43)
Nuclear Precision Health Services [Member] | Operating Segments | Other Segments
Segment Reporting Information [Line Items]
Total revenue	372	330	745	654
OptiFreight Logistics [Member] | Operating Segments | Other Segments
Segment Reporting Information [Line Items]
Total revenue	76	66	150	126
at-Home Solutions [Member] | Operating Segments | Other Segments
Segment Reporting Information [Line Items]
Total revenue	$ 835	$ 739	$ 1,574	$ 1,406