Goodwill and Intangible Assets - Schedule of Intangible Assets (Detail) - USD ($) $ in Millions	Jun. 30, 2023	Sep. 30, 2022
Finite Lived Intangible Assets [Line Items]
Gross Carrying Value, finite lives	$ 103	$ 95
Accumulated Amortization	(40)	(32)
Net Intangible Assets, finite lives	63	63
Developed Technologies [Member]
Finite Lived Intangible Assets [Line Items]
Gross Carrying Value, finite lives	34	34
Accumulated Amortization	(9)	(8)
Net Intangible Assets, finite lives	25	26
Trademarks [Member]
Finite Lived Intangible Assets [Line Items]
Gross Carrying Value, finite lives	2	2
Accumulated Amortization	(1)	(1)
Net Intangible Assets, finite lives	1	1
Customer Relationships [Member]
Finite Lived Intangible Assets [Line Items]
Gross Carrying Value, finite lives	67	59
Accumulated Amortization	(30)	(23)
Net Intangible Assets, finite lives	$ 37	$ 36