Goodwill and Intangible Assets (Tables)

6 Months Ended

Mar. 31, 2018

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, 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 March 31, 2018	$	54	$	43	$	—		$	97

⁽¹⁾ Consists of goodwill acquired in the acquisition of Tech Blend as described in Note C.

⁽²⁾ In the second quarter of fiscal 2018, the Company determined that it was more likely than not that the carrying value of the Purification Solutions reporting unit exceeded its fair value. Accordingly, the Company performed the quantitative goodwill impairment test. Refer to Note E for details on the Purification Solutions goodwill impairment test and the resulting impairment charge recorded.

Schedule of Intangible Assets

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

	March 31, 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	$	—		$	52	$	49	$	(7	)	$	42
Trademarks		9		—			9		16		(1	)		15
Customer relationships		52		(10	)		42		94		(14	)		80
Total intangible assets	$	113	$	(10	)	$	103	$	159	$	(22	)	$	137

⁽¹⁾ Refer to Note E for intangible assets impairment charges recorded in the second fiscal quarter of 2018.