Segment Data Segment Data - Revenues by Geographic Areas (Details) - USD ($) $ in Millions	3 Months Ended								12 Months Ended
	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2017	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2017
Segment Reporting Information [Line Items]
Revenues	$ 4,584	$ 4,350	$ 4,195	$ 4,160	$ 4,402	$ 4,278	$ 4,222	$ 3,080	$ 17,290	$ 15,983	$ 12,093
Operating Segments | Medical
Segment Reporting Information [Line Items]
Revenues									9,064	8,616	7,419
Operating Segments | Life Sciences
Segment Reporting Information [Line Items]
Revenues									4,300	4,330	3,988
Operating Segments | Interventional
Segment Reporting Information [Line Items]
Revenues									3,926	3,037	685
Medication Delivery Solutions | Operating Segments | Medical
Segment Reporting Information [Line Items]
Revenues									3,859	3,644	2,812
Medication Management Solutions | Operating Segments | Medical
Segment Reporting Information [Line Items]
Revenues									2,629	2,470	2,295
Diabetes Care | Operating Segments | Medical
Segment Reporting Information [Line Items]
Revenues									1,110	1,105	1,056
Pharmaceutical Systems | Operating Segments | Medical
Segment Reporting Information [Line Items]
Revenues									1,465	1,397	1,256
Preanalytical Systems | Operating Segments | Life Sciences
Segment Reporting Information [Line Items]
Revenues									1,558	1,553	1,471
Diagnostic Systems | Operating Segments | Life Sciences
Segment Reporting Information [Line Items]
Revenues									1,547	1,536	1,378
Biosciences | Operating Segments | Life Sciences
Segment Reporting Information [Line Items]
Revenues									1,194	1,241	1,139
Surgery | Operating Segments | Interventional
Segment Reporting Information [Line Items]
Revenues									1,397	1,192	666
Peripheral Intervention | Operating Segments | Interventional
Segment Reporting Information [Line Items]
Revenues									1,389	1,045	19
Urology and Critical Care | Operating Segments | Interventional
Segment Reporting Information [Line Items]
Revenues									1,140	800	0
United States
Segment Reporting Information [Line Items]
Revenues									9,730	8,768	6,504
United States | Operating Segments | Medical
Segment Reporting Information [Line Items]
Revenues									5,116	4,770	4,095
United States | Operating Segments | Life Sciences
Segment Reporting Information [Line Items]
Revenues									1,931	1,914	1,818
United States | Operating Segments | Interventional
Segment Reporting Information [Line Items]
Revenues									2,682	2,084	591
United States | Medication Delivery Solutions | Operating Segments | Medical
Segment Reporting Information [Line Items]
Revenues									2,048	1,892	1,378
United States | Medication Management Solutions | Operating Segments | Medical
Segment Reporting Information [Line Items]
Revenues									2,104	1,957	1,843
United States | Diabetes Care | Operating Segments | Medical
Segment Reporting Information [Line Items]
Revenues									573	564	546
United States | Pharmaceutical Systems | Operating Segments | Medical
Segment Reporting Information [Line Items]
Revenues									392	357	328
United States | Preanalytical Systems | Operating Segments | Life Sciences
Segment Reporting Information [Line Items]
Revenues									774	761	741
United States | Diagnostic Systems | Operating Segments | Life Sciences
Segment Reporting Information [Line Items]
Revenues									672	678	622
United States | Biosciences | Operating Segments | Life Sciences
Segment Reporting Information [Line Items]
Revenues									485	475	455
United States | Surgery | Operating Segments | Interventional
Segment Reporting Information [Line Items]
Revenues									1,098	946	577
United States | Peripheral Intervention | Operating Segments | Interventional
Segment Reporting Information [Line Items]
Revenues									787	594	14
United States | Urology and Critical Care | Operating Segments | Interventional
Segment Reporting Information [Line Items]
Revenues									797	544	0
Non-US
Segment Reporting Information [Line Items]
Revenues									7,560	7,215	5,589
Non-US | Operating Segments | Medical
Segment Reporting Information [Line Items]
Revenues									3,947	3,846	3,325
Non-US | Operating Segments | Life Sciences
Segment Reporting Information [Line Items]
Revenues									2,368	2,416	2,170
Non-US | Operating Segments | Interventional
Segment Reporting Information [Line Items]
Revenues									1,244	953	95
Non-US | Medication Delivery Solutions | Operating Segments | Medical
Segment Reporting Information [Line Items]
Revenues									1,811	1,752	1,434
Non-US | Medication Management Solutions | Operating Segments | Medical
Segment Reporting Information [Line Items]
Revenues									525	513	452
Non-US | Diabetes Care | Operating Segments | Medical
Segment Reporting Information [Line Items]
Revenues									538	541	510
Non-US | Pharmaceutical Systems | Operating Segments | Medical
Segment Reporting Information [Line Items]
Revenues									1,073	1,040	929
Non-US | Preanalytical Systems | Operating Segments | Life Sciences
Segment Reporting Information [Line Items]
Revenues									784	792	730
Non-US | Diagnostic Systems | Operating Segments | Life Sciences
Segment Reporting Information [Line Items]
Revenues									875	858	756
Non-US | Biosciences | Operating Segments | Life Sciences
Segment Reporting Information [Line Items]
Revenues									709	766	684
Non-US | Surgery | Operating Segments | Interventional
Segment Reporting Information [Line Items]
Revenues									299	245	89
Non-US | Peripheral Intervention | Operating Segments | Interventional
Segment Reporting Information [Line Items]
Revenues									602	451	6
Non-US | Urology and Critical Care | Operating Segments | Interventional
Segment Reporting Information [Line Items]
Revenues									$ 342	$ 256	$ 0