Other Income (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Jun. 30, 2026	Jun. 30, 2025	Jun. 30, 2026	Jun. 30, 2025
Other Income and Expenses [Abstract]
Interest income	$ 3	$ 4	$ 9	$ 10
Royalty income	4	3	11	9
Net legacy asbestos and environmental charges	(1)	(4)	(3)	(13)
Non-operating pension and postretirement benefit credit	4	0	10	0
Fair value adjustments for earnout payments	0	0	0	(5)
Change in fair value of investments	(7)	0	(7)	(3)
Gain on dissolution of Sensia	20	0	20	0
Other	(1)	2	(1)	10
Other income	$ 22	$ 5	$ 39	$ 8