Segment Data Segment Data - Revenues by Geographic Areas (Details) - USD ($) $ in Millions	12 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2019
Segment Reporting Information [Line Items]
Revenues	$ 20,248	$ 17,117	$ 17,290
Operating Segments | Medical
Segment Reporting Information [Line Items]
Revenues	9,479	8,680	9,064
Operating Segments | Life Sciences
Segment Reporting Information [Line Items]
Revenues	6,530	4,675	4,300
Operating Segments | Interventional
Segment Reporting Information [Line Items]
Revenues	4,239	3,762	3,926
United States
Segment Reporting Information [Line Items]
Revenues	10,969	9,716	9,730
United States | Operating Segments | Medical
Segment Reporting Information [Line Items]
Revenues	5,142	4,802	5,116
United States | Operating Segments | Life Sciences
Segment Reporting Information [Line Items]
Revenues	2,980	2,337	1,931
United States | Operating Segments | Interventional
Segment Reporting Information [Line Items]
Revenues	2,847	2,577	2,682
Non-US
Segment Reporting Information [Line Items]
Revenues	9,279	7,401	7,560
Non-US | Operating Segments | Medical
Segment Reporting Information [Line Items]
Revenues	4,336	3,878	3,947
Non-US | Operating Segments | Life Sciences
Segment Reporting Information [Line Items]
Revenues	3,550	2,337	2,368
Non-US | Operating Segments | Interventional
Segment Reporting Information [Line Items]
Revenues	1,392	1,186	1,244
Medication Delivery Solutions | Operating Segments | Medical
Segment Reporting Information [Line Items]
Revenues	4,057	3,555	3,848
Medication Delivery Solutions | United States | Operating Segments | Medical
Segment Reporting Information [Line Items]
Revenues	2,246	1,972	2,037
Medication Delivery Solutions | Non-US | Operating Segments | Medical
Segment Reporting Information [Line Items]
Revenues	1,812	1,583	1,811
Medication Management Solutions | Operating Segments | Medical
Segment Reporting Information [Line Items]
Revenues	2,432	2,454	2,640
Medication Management Solutions | United States | Operating Segments | Medical
Segment Reporting Information [Line Items]
Revenues	1,863	1,865	2,115
Medication Management Solutions | Non-US | Operating Segments | Medical
Segment Reporting Information [Line Items]
Revenues	570	589	525
Diabetes Care | Operating Segments | Medical
Segment Reporting Information [Line Items]
Revenues	1,160	1,084	1,110
Diabetes Care | United States | Operating Segments | Medical
Segment Reporting Information [Line Items]
Revenues	606	562	573
Diabetes Care | Non-US | Operating Segments | Medical
Segment Reporting Information [Line Items]
Revenues	554	522	538
Pharmaceutical Systems | Operating Segments | Medical
Segment Reporting Information [Line Items]
Revenues	1,829	1,588	1,465
Pharmaceutical Systems | United States | Operating Segments | Medical
Segment Reporting Information [Line Items]
Revenues	428	404	392
Pharmaceutical Systems | Non-US | Operating Segments | Medical
Segment Reporting Information [Line Items]
Revenues	1,401	1,184	1,073
Integrated Diagnostic Solutions | Operating Segments | Life Sciences
Segment Reporting Information [Line Items]
Revenues	5,225	3,532	3,106
Integrated Diagnostic Solutions | United States | Operating Segments | Life Sciences
Segment Reporting Information [Line Items]
Revenues	2,477	1,872	1,446
Integrated Diagnostic Solutions | Non-US | Operating Segments | Life Sciences
Segment Reporting Information [Line Items]
Revenues	2,748	1,659	1,659
Biosciences | Operating Segments | Life Sciences
Segment Reporting Information [Line Items]
Revenues	1,305	1,143	1,194
Biosciences | United States | Operating Segments | Life Sciences
Segment Reporting Information [Line Items]
Revenues	503	465	485
Biosciences | Non-US | Operating Segments | Life Sciences
Segment Reporting Information [Line Items]
Revenues	802	678	709
Surgery | Operating Segments | Interventional
Segment Reporting Information [Line Items]
Revenues	1,296	1,121	1,242
Surgery | United States | Operating Segments | Interventional
Segment Reporting Information [Line Items]
Revenues	1,023	891	977
Surgery | Non-US | Operating Segments | Interventional
Segment Reporting Information [Line Items]
Revenues	274	230	264
Peripheral Intervention | Operating Segments | Interventional
Segment Reporting Information [Line Items]
Revenues	1,711	1,511	1,574
Peripheral Intervention | United States | Operating Segments | Interventional
Segment Reporting Information [Line Items]
Revenues	931	871	917
Peripheral Intervention | Non-US | Operating Segments | Interventional
Segment Reporting Information [Line Items]
Revenues	780	640	657
Urology and Critical Care | Operating Segments | Interventional
Segment Reporting Information [Line Items]
Revenues	1,232	1,130	1,110
Urology and Critical Care | United States | Operating Segments | Interventional
Segment Reporting Information [Line Items]
Revenues	894	815	787
Urology and Critical Care | Non-US | Operating Segments | Interventional
Segment Reporting Information [Line Items]
Revenues	$ 338	$ 315	$ 323