Segment Data - Revenues by Geographic Areas (Details) - USD ($) $ in Millions	12 Months Ended
Sep. 30, 2025	Sep. 30, 2024	Sep. 30, 2023
Segment Reporting Information [Line Items]
Revenues	$ 21,840	$ 20,178	$ 19,372
Operating Segments
Segment Reporting Information [Line Items]
Revenues	21,840	20,245	19,372
Operating Segments \| Medical
Segment Reporting Information [Line Items]
Revenues	11,456	10,074	9,502
Operating Segments \| Life Sciences
Segment Reporting Information [Line Items]
Revenues	5,167	5,191	5,133
Operating Segments \| Interventional
Segment Reporting Information [Line Items]
Revenues	5,217	4,980	4,736
Corporate and All Other
Segment Reporting Information [Line Items]
Revenues	0	(67)	0
United States
Segment Reporting Information [Line Items]
Revenues	12,790	11,663	11,113
United States \| Operating Segments \| Medical
Segment Reporting Information [Line Items]
Revenues	6,916	5,964	5,488
United States \| Operating Segments \| Life Sciences
Segment Reporting Information [Line Items]
Revenues	2,328	2,310	2,377
United States \| Operating Segments \| Interventional
Segment Reporting Information [Line Items]
Revenues	3,545	3,394	3,247
United States \| Corporate and All Other
Segment Reporting Information [Line Items]
Revenues	0	(6)	0
International
Segment Reporting Information [Line Items]
Revenues	9,049	8,515	8,258
International \| Operating Segments \| Medical
Segment Reporting Information [Line Items]
Revenues	4,540	4,110	4,014
International \| Operating Segments \| Life Sciences
Segment Reporting Information [Line Items]
Revenues	2,838	2,881	2,756
International \| Operating Segments \| Interventional
Segment Reporting Information [Line Items]
Revenues	1,671	1,586	1,489
International \| Corporate and All Other
Segment Reporting Information [Line Items]
Revenues	0	(62)	0
Medication Delivery Solutions \| Operating Segments \| Medical
Segment Reporting Information [Line Items]
Revenues	4,575	4,429	4,293
Medication Delivery Solutions \| United States \| Operating Segments \| Medical
Segment Reporting Information [Line Items]
Revenues	2,789	2,661	2,519
Medication Delivery Solutions \| International \| Operating Segments \| Medical
Segment Reporting Information [Line Items]
Revenues	1,787	1,768	1,774
Medication Management Solutions \| Operating Segments \| Medical
Segment Reporting Information [Line Items]
Revenues	3,474	3,297	2,980
Medication Management Solutions \| United States \| Operating Segments \| Medical
Segment Reporting Information [Line Items]
Revenues	2,810	2,627	2,303
Medication Management Solutions \| International \| Operating Segments \| Medical
Segment Reporting Information [Line Items]
Revenues	664	670	677
Pharmaceutical Systems \| Operating Segments \| Medical
Segment Reporting Information [Line Items]
Revenues	2,324	2,273	2,229
Pharmaceutical Systems \| United States \| Operating Segments \| Medical
Segment Reporting Information [Line Items]
Revenues	659	629	666
Pharmaceutical Systems \| International \| Operating Segments \| Medical
Segment Reporting Information [Line Items]
Revenues	1,666	1,644	1,563
Advanced Patient Monitoring \| Operating Segments \| Medical
Segment Reporting Information [Line Items]
Revenues	1,082	74	0
Advanced Patient Monitoring \| United States \| Operating Segments \| Medical
Segment Reporting Information [Line Items]
Revenues	658	47	0
Advanced Patient Monitoring \| International \| Operating Segments \| Medical
Segment Reporting Information [Line Items]
Revenues	424	27	0
Specimen Management \| Operating Segments \| Life Sciences
Segment Reporting Information [Line Items]
Revenues	1,871	1,833	1,737
Specimen Management \| United States \| Operating Segments \| Life Sciences
Segment Reporting Information [Line Items]
Revenues	981	952	906
Specimen Management \| International \| Operating Segments \| Life Sciences
Segment Reporting Information [Line Items]
Revenues	890	882	831
Diagnostic Solutions \| Operating Segments \| Life Sciences
Segment Reporting Information [Line Items]
Revenues	1,838	1,846	1,888
Diagnostic Solutions \| United States \| Operating Segments \| Life Sciences
Segment Reporting Information [Line Items]
Revenues	755	782	869
Diagnostic Solutions \| International \| Operating Segments \| Life Sciences
Segment Reporting Information [Line Items]
Revenues	1,083	1,064	1,019
Biosciences \| Operating Segments \| Life Sciences
Segment Reporting Information [Line Items]
Revenues	1,458	1,512	1,509
Biosciences \| United States \| Operating Segments \| Life Sciences
Segment Reporting Information [Line Items]
Revenues	593	577	603
Biosciences \| International \| Operating Segments \| Life Sciences
Segment Reporting Information [Line Items]
Revenues	865	935	906
Surgery \| Operating Segments \| Interventional
Segment Reporting Information [Line Items]
Revenues	1,572	1,492	1,497
Surgery \| United States \| Operating Segments \| Interventional
Segment Reporting Information [Line Items]
Revenues	1,175	1,130	1,159
Surgery \| International \| Operating Segments \| Interventional
Segment Reporting Information [Line Items]
Revenues	397	363	338
Peripheral Intervention \| Operating Segments \| Interventional
Segment Reporting Information [Line Items]
Revenues	1,996	1,933	1,865
Peripheral Intervention \| United States \| Operating Segments \| Interventional
Segment Reporting Information [Line Items]
Revenues	1,067	1,029	1,016
Peripheral Intervention \| International \| Operating Segments \| Interventional
Segment Reporting Information [Line Items]
Revenues	929	904	849
Urology and Critical Care \| Operating Segments \| Interventional
Segment Reporting Information [Line Items]
Revenues	1,649	1,554	1,374
Urology and Critical Care \| United States \| Operating Segments \| Interventional
Segment Reporting Information [Line Items]
Revenues	1,303	1,236	1,073
Urology and Critical Care \| International \| Operating Segments \| Interventional
Segment Reporting Information [Line Items]
Revenues	$ 345	$ 319	$ 301