Goodwill and Other Intangible Assets - Intangible Assets (Details) - USD ($) $ in Millions	Sep. 30, 2025	Sep. 30, 2024
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	$ 633	$ 669
Accumulated Amortization	(314)	(298)
Net	319	371
Patented technology
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	81	81
Accumulated Amortization	(45)	(39)
Net	36	42
Customer relationships
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	537	563
Accumulated Amortization	(265)	(246)
Net	272	317
Trademarks and other
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	15	25
Accumulated Amortization	(4)	(13)
Net	$ 11	$ 12