Goodwill and Other Intangible Assets (Schedule of Intangible Assets) (Detail) (USD $) In Millions, unless otherwise specified	Jun. 30, 2013		Sep. 30, 2012
Goodwill And Other Intangible Assets [Line Items]
Gross Carrying Value, finite lives	$ 267		$ 278
Trademarks, indefinite lives	57		58
Gross Carrying Value	324		336
Accumulated Amortization	(14)		(6)
Net Intangible Assets, finite lives	253		272
Net Intangible Assets	310		330
Developed Technology [Member]
Goodwill And Other Intangible Assets [Line Items]
Gross Carrying Value, finite lives	153		151
Accumulated Amortization	(7)		(2)
Net Intangible Assets, finite lives	146		149
Customer Relationships [Member]
Goodwill And Other Intangible Assets [Line Items]
Gross Carrying Value, finite lives	111	[1]	121	[1]
Accumulated Amortization	(5)	[1]	(1)	[1]
Net Intangible Assets, finite lives	106	[1]	120	[1]
Other Intangible Assets [Member]
Goodwill And Other Intangible Assets [Line Items]
Gross Carrying Value, finite lives	3		6
Accumulated Amortization	(2)		(3)
Net Intangible Assets, finite lives	$ 1		$ 3

[1] The change in the gross carrying value of the Customer relationships intangibles is primarily due to measurement period adjustments as described in Note C.