Goodwill and Other Intangible Assets - Schedule of Goodwill Balances (Detail) (USD $) In Millions, unless otherwise specified	9 Months Ended
	Jun. 30, 2014
Goodwill And Other Intangible Asset [Line Items]
Beginning balance	$ 502
Goodwill acquired	51
Foreign currency impact	2
Ending balance	555
Reinforcement Materials [Member]
Goodwill And Other Intangible Asset [Line Items]
Beginning balance	25
Goodwill acquired	51
Foreign currency impact
Ending balance	76
Performance Materials [Member]
Goodwill And Other Intangible Asset [Line Items]
Beginning balance	11
Goodwill acquired
Foreign currency impact
Ending balance	11
Purification Solutions [Member]
Goodwill And Other Intangible Asset [Line Items]
Beginning balance	466
Goodwill acquired
Foreign currency impact	2
Ending balance	$ 468