Business Segment Information - Schedule of Reportable Segments (Details) - USD ($) $ in Millions	12 Months Ended
	Sep. 30, 2025	Sep. 30, 2024	Sep. 30, 2023
Segment Reporting Information [Line Items]
Sales	$ 8,342.0	$ 8,264.0	$ 9,058.0
Segment cost of sales	(4,326.0)	(4,413.0)	(4,635.0)
Segment selling, general and administrative expenses	(1,914.0)	(2,001.0)	(2,024.0)
Segment engineering and development expenses	679.0	658.0	706.0
Segment operating earnings	1,703.0	1,595.0	1,929.0
Sales and operating results of reportable segments
Purchase accounting depreciation and amortization, and impairment	(365.0)	(144.0)	(264.0)
Corporate and other	(125.0)	(114.0)	(110.0)
Non-operating pension and postretirement benefit (cost) credit	(1.0)	20.0	(83.0)
Net legacy asbestos and environmental charges	(154.0)	(21.0)	(18.0)
Change in fair value of investments	(3.0)	0.0	279.0
Restructuring reversals	5.0	(97.0)	0.0
Interest expense, net	(143.0)	(139.0)	(125.0)
Income before income taxes	917.0	1,100.0	1,608.0
Intelligent Devices
Segment Reporting Information [Line Items]
Sales	3,756.0	3,804.0	4,098.0
Intelligent Devices | Operating Segments
Segment Reporting Information [Line Items]
Sales	3,756.0	3,804.0	4,098.0
Segment cost of sales	(2,045.0)	(2,072.0)	(2,182.0)
Segment selling, general and administrative expenses	(761.0)	(783.0)	(815.0)
Segment engineering and development expenses	(266.0)	(254.0)	(268.0)
Other segment items	(8.0)	5.0	(5.0)
Segment operating earnings	676.0	700.0	828.0
Software & Control
Segment Reporting Information [Line Items]
Sales	2,383.0	2,187.0	2,886.0
Software & Control | Operating Segments
Segment Reporting Information [Line Items]
Sales	2,383.0	2,187.0	2,886.0
Segment cost of sales	(697.0)	(678.0)	(869.0)
Segment selling, general and administrative expenses	(612.0)	(630.0)	(665.0)
Segment engineering and development expenses	(361.0)	(351.0)	(399.0)
Other segment items	(5.0)	2.0	0.0
Segment operating earnings	708.0	530.0	953.0
Lifecycle Services
Segment Reporting Information [Line Items]
Sales	2,203.0	2,273.0	2,074.0
Lifecycle Services | Operating Segments
Segment Reporting Information [Line Items]
Sales	2,203.0	2,273.0	2,074.0
Segment cost of sales	(1,459.0)	(1,496.0)	(1,508.0)
Segment selling, general and administrative expenses	(377.0)	(363.0)	(382.0)
Segment engineering and development expenses	(52.0)	(46.0)	(43.0)
Other segment items	4.0	(3.0)	7.0
Segment operating earnings	$ 319.0	$ 365.0	$ 148.0