Business Segment Information - Sales and Operating Results (Details) - USD ($) $ in Millions	3 Months Ended
	Dec. 31, 2025	Dec. 31, 2024
Segment Reporting Information [Line Items]
Sales	$ 2,105	$ 1,881
Segment cost of sales	(1,089)	(1,003)
Segment selling, general and administrative expenses	(478)	(476)
Segment engineering and development expenses	(172)	(156)
Segment operating earnings	435	321
Reconciliation of Operating Profit (Loss) from Segments to Consolidated [Abstract]
Purchase accounting depreciation and amortization	(32)	(35)
Corporate and other	(30)	(35)
Non-operating pension and postretirement benefit credit	3	0
Net legacy asbestos and environmental charges	(1)	(3)
Cost associated with dissolution of Sensia	(4)	0
Interest expense, net	(29)	(35)
Income before income taxes	342	213
UNITED STATES
Segment Reporting Information [Line Items]
Sales	1,237	1,052
Intelligent Devices
Segment Reporting Information [Line Items]
Sales	953	806
Intelligent Devices | Operating Segments
Segment Reporting Information [Line Items]
Sales	953	806
Segment cost of sales	(532)	(439)
Segment selling, general and administrative expenses	(192)	(183)
Segment engineering and development expenses	(63)	(61)
Other segment items	(1)	(3)
Segment operating earnings	165	120
Software & Control
Segment Reporting Information [Line Items]
Sales	629	529
Software & Control | Operating Segments
Segment Reporting Information [Line Items]
Sales	629	529
Segment cost of sales	(187)	(160)
Segment selling, general and administrative expenses	(152)	(151)
Segment engineering and development expenses	(95)	(83)
Other segment items	1	(2)
Segment operating earnings	196	133
Lifecycle Services
Segment Reporting Information [Line Items]
Sales	523	546
Lifecycle Services | Operating Segments
Segment Reporting Information [Line Items]
Sales	523	546
Segment cost of sales	(344)	(368)
Segment selling, general and administrative expenses	(93)	(99)
Segment engineering and development expenses	(14)	(12)
Other segment items	2	1
Segment operating earnings	$ 74	$ 68