Goodwill and Intangible Assets (Tables)

12 Months Ended

Sep. 30, 2020

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, 2020 are as follows

	Reinforcement Materials			Performance Chemicals		Total (2)
	(In millions)
Balance at September 30, 2019	$	50		$	40		90
Goodwill acquired(1)		—			45		45
Foreign currency impact		(4	)		3		(1	)
Balance at September 30, 2020	$	46		$	88	$	134

^{(1) Consists of goodwill acquired in the acquisition of SUSN as described in Note C.}

^{(2) The Company incurred $444 million accumulated impairment losses associated with the goodwill of the Purification Solutions segment as of both September 30, 2020 and 2019. There were no accumulated impairment losses associated with the goodwill of the Reinforcement Materials or Performance Chemicals segments.}

Schedule of Intangible Assets

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

	September 30, 2020							September 30, 2019
	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	$	60	$	(8	)	$	52	$	50	$	(5	)	$	45
Trademarks		11		(1	)		10		8		—			8
Customer relationships		56		(15	)		41		57		(14	)		43
Total intangible assets(1)	$	127	$	(24	)	$	103	$	115	$	(19	)	$	96

⁽¹⁾            Total intangible assets as of September 30, 2020 includes $15 million of intangible assets from the acquisition of SUSN as described in Note C.