Goodwill and Intangible Assets - Schedule of Intangible Assets (Detail) - USD ($) $ in Millions	Jun. 30, 2022	Sep. 30, 2021
Finite Lived Intangible Assets [Line Items]
Gross Carrying Value, finite lives	$ 98	$ 133
Accumulated Amortization	(31)	(33)
Net Intangible Assets, finite lives	67	100
Developed Technologies [Member]
Finite Lived Intangible Assets [Line Items]
Gross Carrying Value, finite lives	35	62
Accumulated Amortization	(8)	(12)
Net Intangible Assets, finite lives	27	50
Trademarks [Member]
Finite Lived Intangible Assets [Line Items]
Gross Carrying Value, finite lives	3	11
Accumulated Amortization	(1)	(1)
Net Intangible Assets, finite lives	2	10
Customer Relationships [Member]
Finite Lived Intangible Assets [Line Items]
Gross Carrying Value, finite lives	60	60
Accumulated Amortization	(22)	(20)
Net Intangible Assets, finite lives	$ 38	$ 40