Goodwill and Intangible Assets (Tables)

6 Months Ended

Mar. 31, 2016

Goodwill And Intangible Assets Disclosure [Abstract]

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, 2016 are as follows:

	Reinforcement Materials		Performance Chemicals		Purification Solutions		Total
	(Dollars in millions)
Balance at September 30, 2015	$	55	$	9	$	90	$	154
Foreign currency impact		—		—		1		1
Balance at March 31, 2016	$	55	$	9	$	91	$	155

Schedule of Intangible Assets

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

	March 31, 2016							September 30, 2015
	Gross Carrying Value		Accumulated Amortization			Net Intangible Assets		Gross Carrying Value		Accumulated Amortization			Net Intangible Assets
	(Dollars in millions)
Intangible assets with finite lives
Developed technologies	$	49	$	(2	)	$	47	$	48	$	(1	)	$	47
Trademarks		16		(1	)		15		16		—			16
Customer relationships		95		(8	)		87		96		(6	)		90
Total intangible assets	$	160	$	(11	)	$	149	$	160	$	(7	)	$	153