Goodwill and Other Intangible Assets (Schedule of Intangible Assets) (Detail) (USD $) In Millions, unless otherwise specified	Sep. 30, 2012		Sep. 30, 2011
Goodwill And Other Intangible Assets [Line Items]
Gross Carrying Value	$ 278		$ 5
Trademarks, indefinite lives	58	[1]
Gross Carrying Value	336		5
Accumulated Amortization	(6)		(2)
Net Intangible Assets	272		3
Net Intangible Assets	330		3
Developed Technology [Member]
Goodwill And Other Intangible Assets [Line Items]
Gross Carrying Value	151	[1]
Accumulated Amortization	(2)	[1]
Net Intangible Assets	149	[1]
Customer Relationships [Member]
Goodwill And Other Intangible Assets [Line Items]
Gross Carrying Value	121	[1]
Accumulated Amortization	(1)	[1]
Net Intangible Assets	120	[1]
Other Intangible Assets [Member]
Goodwill And Other Intangible Assets [Line Items]
Gross Carrying Value	6		5
Accumulated Amortization	(3)		(2)
Net Intangible Assets	$ 3		$ 3

[1] Developed technology, Customer relationships and Trademarks relate to the acquisition of Norit in fiscal 2012.