Goodwill and Intangible Assets (Tables)

12 Months Ended

Sep. 30, 2015

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, 2015 are as follows

	Reinforcement Materials			Performance Chemicals			Purification Solutions			Total
	(Dollars in millions)
Balance at September 30, 2014	$	68		$	10		$	458		$	536
Impairment charge		—			—			(352	)		(352	)
Foreign currency impact		(13	)		(1	)		(16	)		(30	)
Balance at September 30, 2015	$	55		$	9		$	90		$	154

	Reinforcement Materials		Performance Chemicals		Purification Solutions			Total
	(Dollars in millions)
Accumulated impairment losses at September 30, 2014		—		—		—			—
Accumulated impairment losses at September 30, 2015	$	—	$	—	$	(352	)	$	(352	)

Schedule of Intangible Assets

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

	September 30, 2015							September 30, 2014
	Gross Carrying Value		Accumulated Amortization			Net Intangible Assets		Gross Carrying Value		Accumulated Amortization			Net Intangible Assets
	(Dollars in millions)
Intangible assets with finite lives(1)
Developed technologies	$	48	$	(1	)	$	47	$	152	$	(16	)	$	136
Trademarks		16		—			16		57		—			57
Customer relationships		96		(6	)		90		171		(17	)		154
Total intangible assets	$	160	$	(7	)	$	153	$	380	$	(33	)	$	347