Goodwill and Intangible Assets - Schedule of Intangible Assets (Detail) - USD ($) $ in Millions	Mar. 31, 2022	Sep. 30, 2021
Finite Lived Intangible Assets [Line Items]
Gross Carrying Value, finite lives	$ 100	$ 133
Accumulated Amortization	(30)	(33)
Net Intangible Assets, finite lives	70	100
Developed Technologies [Member]
Finite Lived Intangible Assets [Line Items]
Gross Carrying Value, finite lives	36	62
Accumulated Amortization	(7)	(12)
Net Intangible Assets, finite lives	29	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	61	60
Accumulated Amortization	(22)	(20)
Net Intangible Assets, finite lives	$ 39	$ 40