Goodwill and Intangible Assets (Tables)

12 Months Ended

Sep. 30, 2017

Goodwill And Intangible Assets Disclosure [Abstract]

Schedule of Goodwill Balances

The carrying amount of goodwill attributable to each reportable segment with goodwill balances and the changes in those balances during the period ended September 30, 2017 are as follows

	Reinforcement Materials		Performance Chemicals		Purification Solutions		Total
	(In millions)
Balance at September 30, 2016	$	52	$	9	$	91	$	152
Foreign currency impact		1		—		1		2
Balance at September 30, 2017	$	53	$	9	$	92	$	154

	Reinforcement Materials		Performance Chemicals		Purification Solutions			Total
	(In millions)
Accumulated impairment losses at September 30, 2016	$	—	$	—	$	(352	)	$	(352	)
Accumulated impairment losses at September 30, 2017	$	—	$	—	$	(352	)	$	(352	)

Schedule of Intangible Assets

The following table provides information regarding the Company’s intangible assets:

	September 30, 2017							September 30, 2016
	Gross Carrying Value		Accumulated Amortization			Net Intangible Assets		Gross Carrying Value		Accumulated Amortization			Net Intangible Assets
	(In millions)
Intangible assets with finite lives
Developed technologies	$	49	$	(7	)	$	42	$	48	$	(4	)	$	44
Trademarks		16		(1	)		15		16		(1	)		15
Customer relationships		94		(14	)		80		90		(9	)		81
Total intangible assets	$	159	$	(22	)	$	137	$	154	$	(14	)	$	140