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Goodwill and Intangible Assets - Schedule of Goodwill Balances (Detail)
$ in Millions
 6 Months Ended
Mar. 31, 2016
USD ($)
Goodwill And Intangible Assets [Line Items]  
Beginning balance $ 154
Foreign currency impact 1
Ending balance 155
Reinforcement Materials [Member]  
Goodwill And Intangible Assets [Line Items]  
Beginning balance 55
Ending balance 55
Performance Chemicals [Member]  
Goodwill And Intangible Assets [Line Items]  
Beginning balance 9
Ending balance 9
Purification Solutions [Member]  
Goodwill And Intangible Assets [Line Items]  
Beginning balance 90
Foreign currency impact 1
Ending balance $ 91