Segment Data Segment Data - Revenues by Geographic Areas (Details) - USD ($) $ in Millions	3 Months Ended								12 Months Ended
	Sep. 30, 2020	Jun. 30, 2020	Mar. 31, 2020	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2018	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2018
Segment Reporting Information [Line Items]
Revenues	$ 4,784	$ 3,855	$ 4,253	$ 4,225	$ 4,584	$ 4,350	$ 4,195	$ 4,160	$ 17,117	$ 17,290	$ 15,983
Operating Segments | Medical
Segment Reporting Information [Line Items]
Revenues									8,680	9,064	8,616
Operating Segments | Life Sciences
Segment Reporting Information [Line Items]
Revenues									4,675	4,300	4,330
Operating Segments | Interventional
Segment Reporting Information [Line Items]
Revenues									3,762	3,926	3,037
Medication Delivery Solutions | Operating Segments | Medical
Segment Reporting Information [Line Items]
Revenues									3,555	3,848	3,627
Medication Management Solutions | Operating Segments | Medical
Segment Reporting Information [Line Items]
Revenues									2,454	2,640	2,487
Diabetes Care | Operating Segments | Medical
Segment Reporting Information [Line Items]
Revenues									1,084	1,110	1,105
Pharmaceutical Systems | Operating Segments | Medical
Segment Reporting Information [Line Items]
Revenues									1,588	1,465	1,397
Preanalytical Systems | Operating Segments | Life Sciences
Segment Reporting Information [Line Items]
Revenues									1,487	1,558	1,553
Diagnostic Systems | Operating Segments | Life Sciences
Segment Reporting Information [Line Items]
Revenues									2,045	1,547	1,536
Biosciences | Operating Segments | Life Sciences
Segment Reporting Information [Line Items]
Revenues									1,143	1,194	1,241
Surgery | Operating Segments | Interventional
Segment Reporting Information [Line Items]
Revenues									1,121	1,242	1,022
Peripheral Intervention | Operating Segments | Interventional
Segment Reporting Information [Line Items]
Revenues									1,511	1,574	1,239
Urology and Critical Care | Operating Segments | Interventional
Segment Reporting Information [Line Items]
Revenues									1,130	1,110	777
Integrated Diagnostic Solutions | Operating Segments | Life Sciences
Segment Reporting Information [Line Items]
Revenues									3,532	3,106	3,089
United States
Segment Reporting Information [Line Items]
Revenues									9,716	9,730	8,768
United States | Operating Segments | Medical
Segment Reporting Information [Line Items]
Revenues									4,802	5,116	4,770
United States | Operating Segments | Life Sciences
Segment Reporting Information [Line Items]
Revenues									2,337	1,931	1,914
United States | Operating Segments | Interventional
Segment Reporting Information [Line Items]
Revenues									2,577	2,682	2,084
United States | Medication Delivery Solutions | Operating Segments | Medical
Segment Reporting Information [Line Items]
Revenues									1,972	2,037	1,875
United States | Medication Management Solutions | Operating Segments | Medical
Segment Reporting Information [Line Items]
Revenues									1,865	2,115	1,974
United States | Diabetes Care | Operating Segments | Medical
Segment Reporting Information [Line Items]
Revenues									562	573	564
United States | Pharmaceutical Systems | Operating Segments | Medical
Segment Reporting Information [Line Items]
Revenues									404	392	357
United States | Preanalytical Systems | Operating Segments | Life Sciences
Segment Reporting Information [Line Items]
Revenues									769	774	761
United States | Diagnostic Systems | Operating Segments | Life Sciences
Segment Reporting Information [Line Items]
Revenues									1,103	672	678
United States | Biosciences | Operating Segments | Life Sciences
Segment Reporting Information [Line Items]
Revenues									465	485	475
United States | Surgery | Operating Segments | Interventional
Segment Reporting Information [Line Items]
Revenues									891	977	820
United States | Peripheral Intervention | Operating Segments | Interventional
Segment Reporting Information [Line Items]
Revenues									871	917	728
United States | Urology and Critical Care | Operating Segments | Interventional
Segment Reporting Information [Line Items]
Revenues									815	787	536
United States | Integrated Diagnostic Solutions | Operating Segments | Life Sciences
Segment Reporting Information [Line Items]
Revenues									1,872	1,446	1,438
Non-US
Segment Reporting Information [Line Items]
Revenues									7,401	7,560	7,215
Non-US | Operating Segments | Medical
Segment Reporting Information [Line Items]
Revenues									3,878	3,947	3,846
Non-US | Operating Segments | Life Sciences
Segment Reporting Information [Line Items]
Revenues									2,337	2,368	2,416
Non-US | Operating Segments | Interventional
Segment Reporting Information [Line Items]
Revenues									1,186	1,244	953
Non-US | Medication Delivery Solutions | Operating Segments | Medical
Segment Reporting Information [Line Items]
Revenues									1,583	1,811	1,752
Non-US | Medication Management Solutions | Operating Segments | Medical
Segment Reporting Information [Line Items]
Revenues									589	525	513
Non-US | Diabetes Care | Operating Segments | Medical
Segment Reporting Information [Line Items]
Revenues									522	538	541
Non-US | Pharmaceutical Systems | Operating Segments | Medical
Segment Reporting Information [Line Items]
Revenues									1,184	1,073	1,040
Non-US | Preanalytical Systems | Operating Segments | Life Sciences
Segment Reporting Information [Line Items]
Revenues									718	784	792
Non-US | Diagnostic Systems | Operating Segments | Life Sciences
Segment Reporting Information [Line Items]
Revenues									941	875	858
Non-US | Biosciences | Operating Segments | Life Sciences
Segment Reporting Information [Line Items]
Revenues									678	709	766
Non-US | Surgery | Operating Segments | Interventional
Segment Reporting Information [Line Items]
Revenues									230	264	202
Non-US | Peripheral Intervention | Operating Segments | Interventional
Segment Reporting Information [Line Items]
Revenues									640	657	511
Non-US | Urology and Critical Care | Operating Segments | Interventional
Segment Reporting Information [Line Items]
Revenues									315	323	240
Non-US | Integrated Diagnostic Solutions | Operating Segments | Life Sciences
Segment Reporting Information [Line Items]
Revenues									$ 1,659	$ 1,659	$ 1,651