Segment Information (Revenue by Reportable Segment) (Details) - USD ($) $ in Millions	12 Months Ended
	Jun. 30, 2025	Jun. 30, 2024	Jun. 30, 2023
Segment Reporting Information [Line Items]
Revenue	$ 222,578	$ 226,827	$ 204,979
Cost of products sold	214,410	219,413	198,105
Distribution, selling, general, and administrative expenses	5,382	5,000	4,800
Depreciation and amortization	790	710	692
Non-US [Member]
Segment Reporting Information [Line Items]
Revenue	1,669	1,681	1,617
United States
Segment Reporting Information [Line Items]
Revenue	220,993	225,231	203,440
Operating Segments
Segment Reporting Information [Line Items]
Revenue	222,662	226,912	205,057
Cost of products sold	214,492	219,495	198,181
Distribution, selling, general, and administrative expenses	5,261	4,887	4,746
Costs and Expenses	219,753	224,382	202,927
Operating Segments | GMPD
Segment Reporting Information [Line Items]
Revenue	12,636	12,381	12,222
Cost of products sold	10,470	10,264	10,377
Distribution, selling, general, and administrative expenses	2,031	2,025	1,992
Costs and Expenses	12,501	12,289	12,369
Depreciation and amortization	212	205	173
Operating Segments | Other Operating Segment
Segment Reporting Information [Line Items]
Revenue	5,382	4,512	4,021
Cost of products sold	4,023	3,367	2,990
Distribution, selling, general, and administrative expenses	843	722	635
Costs and Expenses	4,866	4,089	3,625
Depreciation and amortization	88	79	71
Operating Segments | Other Operating Segment | OptiFreight Logistics
Segment Reporting Information [Line Items]
Revenue	324	274	240
Operating Segments | Other Operating Segment | at-Home Solutions
Segment Reporting Information [Line Items]
Revenue	3,480	2,869	2,584
Operating Segments | Other Operating Segment | Nuclear Precision Health Solutions
Segment Reporting Information [Line Items]
Revenue	1,578	1,369	1,197
Operating Segments | Pharmaceutical and Specialty Solutions
Segment Reporting Information [Line Items]
Revenue	204,644	210,019	188,814
Cost of products sold	199,999	205,864	184,814
Distribution, selling, general, and administrative expenses	2,387	2,140	2,119
Costs and Expenses	202,386	208,004	186,933
Depreciation and amortization	185	184	194
Segment Reporting, Reconciling Item, Corporate Nonsegment [Member]
Segment Reporting Information [Line Items]
Revenue	(84)	(85)	(78)
Depreciation and amortization	$ 305	$ 242	$ 254