Goodwill and Intangible Assets - Schedule of Goodwill Balances (Detail) $ in Millions	3 Months Ended
	Dec. 31, 2016 USD ($)
Goodwill And Intangible Assets [Line Items]
Beginning balance	$ 152
Foreign currency impact	(5)
Ending balance	147
Reinforcement Materials [Member]
Goodwill And Intangible Assets [Line Items]
Beginning balance	52
Foreign currency impact	(3)
Ending balance	49
Performance Chemicals [Member]
Goodwill And Intangible Assets [Line Items]
Beginning balance	9
Foreign currency impact	(1)
Ending balance	8
Purification Solutions [Member]
Goodwill And Intangible Assets [Line Items]
Beginning balance	91
Foreign currency impact	(1)
Ending balance	$ 90