Goodwill and Intangible Assets - Schedule of Intangible Assets (Detail) - USD ($) $ in Millions	Sep. 30, 2016	Sep. 30, 2015
Finite Lived Intangible Assets [Line Items]
Gross Carrying Value, finite lives	$ 154	$ 160
Accumulated Amortization	(14)	(7)
Net Intangible Assets, finite lives	140	153
Developed Technologies [Member]
Finite Lived Intangible Assets [Line Items]
Gross Carrying Value, finite lives	48	48
Accumulated Amortization	(4)	(1)
Net Intangible Assets, finite lives	44	47
Trademarks [Member]
Finite Lived Intangible Assets [Line Items]
Gross Carrying Value, finite lives	16	16
Accumulated Amortization	(1)
Net Intangible Assets, finite lives	15	16
Customer Relationships [Member]
Finite Lived Intangible Assets [Line Items]
Gross Carrying Value, finite lives	90	96
Accumulated Amortization	(9)	(6)
Net Intangible Assets, finite lives	$ 81	$ 90