Goodwill and Intangible Assets (Tables)

12 Months Ended

Sep. 30, 2018

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 period ended September 30, 2018 are as follows

	Reinforcement Materials			Performance Chemicals			Purification Solutions			Total
	(In millions)
Balance at September 30, 2017	$	53		$	9		$	92		$	154
Goodwill acquired ⁽¹⁾		—			33			—			33
Impairment charge ⁽²⁾		—			—			(92	)		(92	)
Foreign currency impact		(1	)		(1	)		—			(2	)
Balance at September 30, 2018	$	52		$	41		$	—		$	93

⁽¹⁾

Consists of goodwill acquired in the acquisition of Tech Blend as described in Note C.

⁽²⁾

Refer to Note F for details on the Purification Solutions goodwill impairment test and the resulting impairment charge recorded in the second fiscal quarter of 2018. Based on the Company’s most recent annual goodwill impairment test performed as of May 31, 2018, the fair values of the Reinforcement Materials, Fumed Metal Oxides, and Specialty Compounds reporting units were substantially in excess of their carrying values.

	Reinforcement Materials		Performance Chemicals		Purification Solutions			Total
	(In millions)
Accumulated impairment losses at September 30, 2017	$	—	$	—	$	(352	)	$	(352	)
Accumulated impairment losses at September 30, 2018	$	—	$	—	$	(444	)	$	(444	)

Schedule of Intangible Assets

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

	September 30, 2018							September 30, 2017
	Gross Carrying Value		Accumulated Amortization			Net Intangible Assets		Gross Carrying Value		Accumulated Amortization			Net Intangible Assets
	(In millions)
Intangible assets with finite lives ⁽¹⁾
Developed technologies	$	52	$	(2	)	$	50	$	49	$	(7	)	$	42
Trademarks		8		—			8		16		(1	)		15
Customer relationships		51		(11	)		40		94		(14	)		80
Total intangible assets	$	111	$	(13	)	$	98	$	159	$	(22	)	$	137

⁽¹⁾

Refer to Note F for intangible assets impairment charges recorded in the second fiscal quarter of 2018.