Goodwill and Intangible Assets (Tables)

6 Months Ended

Mar. 31, 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 six month period ended March 31, 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	)
Balance at March 31, 2017	$	52	$	9	$	90		$	151

Schedule of Intangible Assets

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

	March 31, 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	$	47	$	(5	)	$	42	$	48	$	(4	)	$	44
Trademarks		14		(1	)		13		16		(1	)		15
Customer relationships		91		(12	)		79		90		(9	)		81
Total intangible assets	$	152	$	(18	)	$	134	$	154	$	(14	)	$	140