Other Income (Details) - USD ($) $ in Millions	3 Months Ended
	Dec. 31, 2025	Dec. 31, 2024
Other Income and Expenses [Abstract]
Interest income	$ 3	$ 4
Royalty income	3	3
Net legacy asbestos and environmental charges	(1)	(3)
Non-operating pension and postretirement benefit credit	3	0
Other	0	2
Other income	$ 8	$ 6