Segment Data - Revenues by Geographic Areas (Detail) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Mar. 31, 2021	Mar. 31, 2020	Mar. 31, 2021	Mar. 31, 2020
Segment Reporting Information [Line Items]
Revenues	$ 4,907	$ 4,253	$ 10,223	$ 8,479
Operating Segments | Medical
Segment Reporting Information [Line Items]
Revenues	2,311	2,151	4,572	4,241
Operating Segments | Life Sciences
Segment Reporting Information [Line Items]
Revenues	1,586	1,113	3,565	2,236
Operating Segments | Interventional
Segment Reporting Information [Line Items]
Revenues	1,011	990	2,086	2,002
United States
Segment Reporting Information [Line Items]
Revenues	2,462	2,415	5,592	4,845
United States | Operating Segments | Medical
Segment Reporting Information [Line Items]
Revenues	1,220	1,200	2,494	2,404
United States | Operating Segments | Life Sciences
Segment Reporting Information [Line Items]
Revenues	576	522	1,710	1,060
United States | Operating Segments | Interventional
Segment Reporting Information [Line Items]
Revenues	666	693	1,388	1,381
International
Segment Reporting Information [Line Items]
Revenues	2,446	1,839	4,631	3,634
International | Operating Segments | Medical
Segment Reporting Information [Line Items]
Revenues	1,091	951	2,078	1,836
International | Operating Segments | Life Sciences
Segment Reporting Information [Line Items]
Revenues	1,010	591	1,855	1,176
International | Operating Segments | Interventional
Segment Reporting Information [Line Items]
Revenues	345	297	698	621
Medication Delivery Solutions | Operating Segments | Medical
Segment Reporting Information [Line Items]
Revenues	999	904	2,006	1,852
Medication Delivery Solutions | United States | Operating Segments | Medical
Segment Reporting Information [Line Items]
Revenues	531	518	1,099	1,038
Medication Delivery Solutions | International | Operating Segments | Medical
Segment Reporting Information [Line Items]
Revenues	468	386	908	814
Medication Management Solutions | Operating Segments | Medical
Segment Reporting Information [Line Items]
Revenues	566	568	1,196	1,143
Medication Management Solutions | United States | Operating Segments | Medical
Segment Reporting Information [Line Items]
Revenues	440	449	917	912
Medication Management Solutions | International | Operating Segments | Medical
Segment Reporting Information [Line Items]
Revenues	126	119	278	231
Diabetes Care | Operating Segments | Medical
Segment Reporting Information [Line Items]
Revenues	284	278	569	547
Diabetes Care | United States | Operating Segments | Medical
Segment Reporting Information [Line Items]
Revenues	148	142	298	281
Diabetes Care | International | Operating Segments | Medical
Segment Reporting Information [Line Items]
Revenues	135	137	271	266
Pharmaceutical Systems | Operating Segments | Medical
Segment Reporting Information [Line Items]
Revenues	462	400	801	699
Pharmaceutical Systems | United States | Operating Segments | Medical
Segment Reporting Information [Line Items]
Revenues	100	91	180	174
Pharmaceutical Systems | International | Operating Segments | Medical
Segment Reporting Information [Line Items]
Revenues	361	309	621	525
Integrated Diagnostic Solutions | Operating Segments | Life Sciences
Segment Reporting Information [Line Items]
Revenues	1,261	833	2,928	1,633
Integrated Diagnostic Solutions | United States | Operating Segments | Life Sciences
Segment Reporting Information [Line Items]
Revenues	454	413	1,469	799
Integrated Diagnostic Solutions | International | Operating Segments | Life Sciences
Segment Reporting Information [Line Items]
Revenues	807	420	1,459	834
Biosciences | Operating Segments | Life Sciences
Segment Reporting Information [Line Items]
Revenues	325	280	637	603
Biosciences | United States | Operating Segments | Life Sciences
Segment Reporting Information [Line Items]
Revenues	121	108	241	260
Biosciences | International | Operating Segments | Life Sciences
Segment Reporting Information [Line Items]
Revenues	204	172	396	342
Surgery | Operating Segments | Interventional
Segment Reporting Information [Line Items]
Revenues	292	312	624	638
Surgery | United States | Operating Segments | Interventional
Segment Reporting Information [Line Items]
Revenues	227	249	489	505
Surgery | International | Operating Segments | Interventional
Segment Reporting Information [Line Items]
Revenues	65	63	135	133
Peripheral Intervention | Operating Segments | Interventional
Segment Reporting Information [Line Items]
Revenues	420	399	846	794
Peripheral Intervention | United States | Operating Segments | Interventional
Segment Reporting Information [Line Items]
Revenues	222	242	454	467
Peripheral Intervention | International | Operating Segments | Interventional
Segment Reporting Information [Line Items]
Revenues	198	157	392	327
Urology and Critical Care | Operating Segments | Interventional
Segment Reporting Information [Line Items]
Revenues	298	279	616	570
Urology and Critical Care | United States | Operating Segments | Interventional
Segment Reporting Information [Line Items]
Revenues	217	202	445	409
Urology and Critical Care | International | Operating Segments | Interventional
Segment Reporting Information [Line Items]
Revenues	$ 82	$ 76	$ 171	$ 161