Goodwill and Intangible Assets - Schedule of Intangible Assets (Detail) - USD ($) $ in Millions	Dec. 31, 2022	Sep. 30, 2022
Finite Lived Intangible Assets [Line Items]
Gross Carrying Value, finite lives	$ 97	$ 95
Accumulated Amortization	(34)	(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	(8)	(8)
Net Intangible Assets, finite lives	26	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	61	59
Accumulated Amortization	(25)	(23)
Net Intangible Assets, finite lives	$ 36	$ 36