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Business Segments Information (Results Of Operations By Business Segments ) (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]
Net sales	$ 4,971	$ 4,684	$ 4,570	$ 4,147	$ 4,888	$ 4,456	$ 4,248	$ 3,816	$ 18,372	$ 17,408	$ 15,264
Stock compensation									120	216
Pretax earnings (loss)									2,859	2,667	2,335
Total Assets	20,497				20,390				20,497	20,390	19,589
Automation Solutions [Member] \| Measurement & Analytical Instrumentation [Member]
Segment Reporting Information [Line Items]
Net sales									3,807	3,604	3,070
Automation Solutions [Member] \| Valves, Actuators & Regulators [Member]
Segment Reporting Information [Line Items]
Net sales									3,794	3,749	2,659
Automation Solutions [Member] \| Industrial Solutions [Member]
Segment Reporting Information [Line Items]
Net sales									2,232	1,967	1,689
Automation Solutions [Member] \| Process Control Systems & Solutions [Member]
Segment Reporting Information [Line Items]
Net sales									2,369	2,121	2,000
Operating Segments [Member] \| Automation Solutions [Member]
Segment Reporting Information [Line Items]
Net sales									12,202	11,441	9,418
Pretax earnings (loss)									1,947	1,886	1,522
Total Assets	13,996				13,720				13,996	13,720	12,581
Operating Segments [Member] \| Commercial & Residential Solutions [Member]
Segment Reporting Information [Line Items]
Net sales									6,169	5,982	5,857
Pretax earnings (loss)									1,271	1,352	1,358
Total Assets	4,347				4,496				4,347	4,496	3,377
Operating Segments [Member] \| Climate Technologies [Member]
Segment Reporting Information [Line Items]
Net sales									4,313	4,454	4,212
Pretax earnings (loss)									883	972	975
Total Assets	2,885				2,936				2,885	2,936	2,547
Operating Segments [Member] \| Tools & Home Products [Member]
Segment Reporting Information [Line Items]
Net sales									1,856	1,528	1,645
Pretax earnings (loss)									388	380	383
Total Assets	1,462				1,560				1,462	1,560	830
Segment Reconciling Items [Member]
Segment Reporting Information [Line Items]
Pension and postretirement costs									108	79	27
Corporate, Non-Segment [Member]
Segment Reporting Information [Line Items]
Stock compensation									(120)	(216)	(110)
Pretax earnings (loss)									(173)	(275)	(297)
Corporate, Non-Segment [Member] \| Corporate and other [Member]
Segment Reporting Information [Line Items]
Total Assets	$ 2,154				$ 2,174				2,154	2,174	3,631
Intersegment Eliminations [Member]
Segment Reporting Information [Line Items]
Net sales									1	(15)	(11)
Pretax earnings (loss)									$ (174)	$ (159)	$ (165)