Goodwill and Intangible Assets

6 Months Ended

Mar. 31, 2019

Goodwill And Intangible Assets Disclosure [Abstract]

G. Goodwill and Intangible Assets

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, 2019 are as follows:

	Reinforcement Materials			Performance Chemicals			Total
	(In millions)
Balance at September 30, 2018	$	52		$	41		$	93
Foreign currency impact		(1	)		(1	)		(2	)
Balance at March 31, 2019	$	51		$	40		$	91

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

	March 31, 2019							September 30, 2018
	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	$	51	$	(3	)	$	48	$	52	$	(2	)	$	50
Trademarks		8		—			8		8		—			8
Customer relationships		50		(13	)		37		51		(11	)		40
Total intangible assets	$	109	$	(16	)	$	93	$	111	$	(13	)	$	98

Intangible assets are amortized over their estimated useful lives, which range between twelve and twenty-five years, with a weighted average amortization period of approximately nineteen years. Amortization expense for the three month periods ended March 31, 2019 and 2018 was $2 million and $3 million, respectively, and is included in Cost of sales, Selling and administrative expenses, and research and technical expenses in the Consolidated Statements of Operations. Amortization expense for the six month periods ended March 31, 2019 and 2018 was $3 million and $5 million, respectively, and is included in Cost of sales, Selling and administrative expenses, and research and technical expenses in the Consolidated Statements of Operations. Total amortization expense is estimated to be approximately $6 million each year for the next five fiscal years.