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Segment Information (Revenue by Reportable Segment) (Details) - USD ($) $ in Millions	3 Months Ended						12 Months Ended
	Mar. 31, 2024	Dec. 31, 2023	Sep. 30, 2023	Mar. 31, 2023	Dec. 31, 2022	Sep. 30, 2022	Jun. 30, 2024	Jun. 30, 2023	Jun. 30, 2022
Segment Reporting Information [Line Items]
Revenue	$ 54,868	$ 57,442	$ 54,650	$ 50,498	$ 51,468	$ 49,592	$ 226,827	$ 204,979	$ 181,326
Depreciation and amortization							710	692	692
Non-US [Member]
Segment Reporting Information [Line Items]
Revenue							1,681	1,617	1,923
United States
Segment Reporting Information [Line Items]
Revenue							225,231	203,440	179,471
Operating Segments
Segment Reporting Information [Line Items]
Revenue							226,912	205,057	181,394
Operating Segments | GMPD
Segment Reporting Information [Line Items]
Revenue							12,381	12,222	13,280
Depreciation and amortization							205	173	176
Operating Segments | Other Operating Segment
Segment Reporting Information [Line Items]
Revenue							4,512	4,021	3,518
Depreciation and amortization							79	71	65
Operating Segments | Other Operating Segment | OptiFreight Logistics
Segment Reporting Information [Line Items]
Revenue							274	240	213
Operating Segments | Other Operating Segment | at-Home Solutions
Segment Reporting Information [Line Items]
Revenue							2,869	2,584	2,394
Operating Segments | Other Operating Segment | Nuclear Precision Health Solutions
Segment Reporting Information [Line Items]
Revenue							1,369	1,197	911
Operating Segments | Pharmaceutical and Specialty Solutions
Segment Reporting Information [Line Items]
Revenue							210,019	188,814	164,596
Depreciation and amortization							184	194	170
Total operating earnings/(loss)
Segment Reporting Information [Line Items]
Revenue							(85)	(78)	(68)
Depreciation and amortization							$ 242	$ 254	$ 281

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