Business Segments Information (Results Of Operations By Business Segments ) (Details) - USD ($) $ in Millions	3 Months Ended								12 Months Ended
	Sep. 30, 2022	Jun. 30, 2022	Mar. 31, 2022	Dec. 31, 2021	Sep. 30, 2021	Jun. 30, 2021	Mar. 31, 2021	Dec. 31, 2020	Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2020
Segment Reporting Information [Line Items]
Net sales	$ 5,360	$ 5,005	$ 4,791	$ 4,473	$ 4,947	$ 4,697	$ 4,431	$ 4,161	$ 19,629	$ 18,236	$ 16,785
Stock compensation									144	224	110
Earnings before income taxes									4,085	2,912	2,335
Total Assets	35,672				24,715				35,672	24,715	22,882
Interest Income (Expense), Nonoperating, Net									(193)	(154)	(156)
Gain on subordinated interest									(453)	0	0
Disposal Group, Not Discontinued Operation, Gain (Loss) on Disposal									486	0	0
Automation Solutions [Member] | Measurement & Analytical Instrumentation [Member]
Segment Reporting Information [Line Items]
Net sales									3,206	3,071	3,108
Automation Solutions [Member] | Valves, Actuators & Regulators [Member]
Segment Reporting Information [Line Items]
Net sales									3,604	3,483	3,589
Automation Solutions [Member] | Industrial Solutions [Member]
Segment Reporting Information [Line Items]
Net sales									2,403	2,266	2,012
Automation Solutions [Member] | Systems & Software [Member]
Segment Reporting Information [Line Items]
Net sales									2,545	2,472	2,317
AspenTech [Member]
Segment Reporting Information [Line Items]
Stock compensation									32	0	0
Operating Segments [Member] | Automation Solutions [Member]
Segment Reporting Information [Line Items]
Net sales									11,758	11,292	11,026
Earnings before income taxes									2,356	1,955	1,539
Total Assets	13,184				13,734				13,184	13,734	13,704
Operating Segments [Member] | AspenTech [Member]
Segment Reporting Information [Line Items]
Net sales									656	319	131
Earnings before income taxes									12	(7)	(16)
Total Assets	14,484				2,089				14,484	2,089	546
Operating Segments [Member] | Commercial & Residential Solutions [Member]
Segment Reporting Information [Line Items]
Net sales									7,233	6,653	5,643
Earnings before income taxes									1,440	1,364	1,118
Total Assets	4,695				4,867				4,695	4,867	4,556
Operating Segments [Member] | Climate Technologies [Member]
Segment Reporting Information [Line Items]
Net sales									5,200	4,748	3,980
Earnings before income taxes									1,038	965	801
Total Assets	3,209				3,269				3,209	3,269	3,065
Operating Segments [Member] | Tools & Home Products [Member]
Segment Reporting Information [Line Items]
Net sales									2,033	1,905	1,663
Earnings before income taxes									402	399	317
Total Assets	1,486				1,598				1,486	1,598	1,491
Segment Reconciling Items [Member]
Segment Reporting Information [Line Items]
Unallocated pension and postretirement costs									99	94	53
Interest Income (Expense), Nonoperating, Net									(193)	(154)	(156)
Gain on subordinated interest									453	0	0
Disposal Group, Not Discontinued Operation, Gain (Loss) on Disposal									486	0	0
Corporate, Non-Segment [Member]
Segment Reporting Information [Line Items]
Stock compensation									(144)	(224)	(110)
Earnings before income taxes									(424)	(116)	(93)
Corporate, Non-Segment [Member] | Corporate and other [Member]
Segment Reporting Information [Line Items]
Total Assets	$ 3,309				$ 4,025				3,309	4,025	4,076
Intersegment Eliminations [Member]
Segment Reporting Information [Line Items]
Net sales									$ (18)	$ (28)	$ (15)