Business Segment Information -Schedule of Sales and Operating Results of Reportable Segments (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Jun. 30, 2026	Jun. 30, 2025	Jun. 30, 2026	Jun. 30, 2025
Segment Reporting [Line Items]
Sales	$ 2,313	$ 2,144	$ 6,657	$ 6,026
Segment cost of sales	(1,169)	(1,098)	(3,372)	(3,130)
Segment selling, general and administrative expenses	(490)	(498)	(1,446)	(1,443)
Segment engineering and development expenses	(173)	(170)	(525)	(488)
Segment operating earnings	550	454	1,515	1,183
Segment Reporting, Reconciliation of Profit (Loss) by Segment to Consolidated [Abstract]
Amortization of acquisition-related intangible assets	(30)	(35)	(91)	(106)
Corporate and other	(34)	(36)	(90)	(98)
Non-operating pension and postretirement benefit credit	4	0	10	0
Net legacy asbestos and environmental charges	(1)	(4)	(3)	(13)
Change in fair value of investments	(7)	0	(7)	(3)
Gain on dissolution of Sensia, net of transaction costs	18	0	10	0
Interest expense, net	(30)	(37)	(92)	(109)
Income before income taxes	470	342	1,252	854
Intelligent Devices
Segment Reporting [Line Items]
Sales	1,080	968	3,041	2,670
Intelligent Devices | Operating Segments
Segment Reporting [Line Items]
Sales	1,080	968	3,041	2,670
Segment cost of sales	(590)	(518)	(1,655)	(1,439)
Segment selling, general and administrative expenses	(206)	(200)	(596)	(571)
Segment engineering and development expenses	(69)	(67)	(198)	(193)
Other segment items	1	(1)	0	(6)
Segment operating earnings	216	182	592	461
Software & Control
Segment Reporting [Line Items]
Sales	751	629	2,064	1,726
Software & Control | Operating Segments
Segment Reporting [Line Items]
Sales	751	629	2,064	1,726
Segment cost of sales	(230)	(183)	(613)	(503)
Segment selling, general and administrative expenses	(163)	(158)	(469)	(456)
Segment engineering and development expenses	(97)	(90)	(290)	(261)
Other segment items	0	1	4	(3)
Segment operating earnings	261	199	696	503
Lifecycle Services
Segment Reporting [Line Items]
Sales	482	547	1,552	1,630
Lifecycle Services | Operating Segments
Segment Reporting [Line Items]
Sales	482	547	1,552	1,630
Segment cost of sales	(317)	(362)	(1,022)	(1,082)
Segment selling, general and administrative expenses	(81)	(95)	(263)	(290)
Segment engineering and development expenses	(7)	(13)	(37)	(36)
Other segment items	(4)	(4)	(3)	(3)
Segment operating earnings	$ 73	$ 73	$ 227	$ 219