Discontinued Operations and Notes Receivable from Sale of Business - Summary of Assets Held for Sale (Detail) (USD $) In Millions, unless otherwise specified	Jun. 30, 2014	Sep. 30, 2013
Long Lived Assets Held-for-sale [Line Items]
Current assets held for sale	$ 4	$ 4
Noncurrent assets held for sale	9	9
Inventories [Member]
Long Lived Assets Held-for-sale [Line Items]
Current assets held for sale	3	3
Other Current Assets [Member]
Long Lived Assets Held-for-sale [Line Items]
Current assets held for sale	1	1
Property, Plant and Equipment, Net [Member]
Long Lived Assets Held-for-sale [Line Items]
Noncurrent assets held for sale	5	5
Goodwill [Member]
Long Lived Assets Held-for-sale [Line Items]
Noncurrent assets held for sale	2	2
Intangible Assets, Net [Member]
Long Lived Assets Held-for-sale [Line Items]
Noncurrent assets held for sale	$ 2	$ 2