Business Segments Information (Results Of Operations By Business Segments ) (Details) - USD ($) $ in Millions	3 Months Ended								12 Months Ended
	Sep. 30, 2021	Jun. 30, 2021	Mar. 31, 2021	Dec. 31, 2020	Sep. 30, 2020	Jun. 30, 2020	Mar. 31, 2020	Dec. 31, 2019	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2019
Segment Reporting Information [Line Items]
Net sales	$ 4,947	$ 4,697	$ 4,431	$ 4,161	$ 4,558	$ 3,914	$ 4,162	$ 4,151	$ 18,236	$ 16,785	$ 18,372
Stock compensation									224	110	120
Earnings before income taxes									2,912	2,335	2,859
Total Assets	24,715				22,882				24,715	22,882	20,497
Interest Income (Expense), Nonoperating, Net									(154)	(156)	(174)
Automation Solutions [Member] | Measurement & Analytical Instrumentation [Member]
Segment Reporting Information [Line Items]
Net sales									3,071	3,108	3,615
Automation Solutions [Member] | Valves, Actuators & Regulators [Member]
Segment Reporting Information [Line Items]
Net sales									3,483	3,589	3,794
Automation Solutions [Member] | Industrial Solutions [Member]
Segment Reporting Information [Line Items]
Net sales									2,266	2,012	2,232
Automation Solutions [Member] | Systems & Software [Member]
Segment Reporting Information [Line Items]
Net sales									2,790	2,446	2,561
Operating Segments [Member] | Automation Solutions [Member]
Segment Reporting Information [Line Items]
Net sales									11,610	11,155	12,202
Earnings before income taxes									1,948	1,523	1,947
Total Assets	15,823				14,250				15,823	14,250	13,996
Operating Segments [Member] | Commercial & Residential Solutions [Member]
Segment Reporting Information [Line Items]
Net sales									6,653	5,643	6,169
Earnings before income taxes									1,364	1,118	1,271
Total Assets	4,867				4,556				4,867	4,556	4,347
Operating Segments [Member] | Climate Technologies [Member]
Segment Reporting Information [Line Items]
Net sales									4,748	3,980	4,313
Earnings before income taxes									965	801	883
Total Assets	3,269				3,065				3,269	3,065	2,885
Operating Segments [Member] | Tools & Home Products [Member]
Segment Reporting Information [Line Items]
Net sales									1,905	1,663	1,856
Earnings before income taxes									399	317	388
Total Assets	1,598				1,491				1,598	1,491	1,462
Segment Reconciling Items [Member]
Segment Reporting Information [Line Items]
Unallocated pension and postretirement costs									94	53	108
Interest Income (Expense), Nonoperating, Net									(154)	(156)	(174)
Corporate, Non-Segment [Member]
Segment Reporting Information [Line Items]
Stock compensation									(224)	(110)	(120)
Earnings before income taxes									(116)	(93)	(173)
Corporate, Non-Segment [Member] | Corporate and other [Member]
Segment Reporting Information [Line Items]
Total Assets	$ 4,025				$ 4,076				4,025	4,076	2,154
Intersegment Eliminations [Member]
Segment Reporting Information [Line Items]
Net sales									$ (27)	$ (13)	$ 1