Goodwill and Intangible Assets

3 Months Ended

Dec. 31, 2018

Goodwill And Intangible Assets Disclosure [Abstract]

Goodwill and Intangible Assets

E. 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 three month period ended December 31, 2018 are as follows:

	Reinforcement Materials			Performance Chemicals			Total
	(In millions)
Balance at September 30, 2018	$	52		$	41		$	93
Foreign currency impact		(2	)		(1	)		(3	)
Balance at December 31, 2018	$	50		$	40		$	90

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

	December 31, 2018							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	$	(2	)	$	49	$	52	$	(2	)	$	50
Trademarks		8		—			8		8		—			8
Customer relationships		49		(12	)		37		51		(11	)		40
Total intangible assets	$	108	$	(14	)	$	94	$	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 December 31, 2018 and 2017 was $1 million and $2 million, respectively, and is included in Cost of sales and Selling and administrative 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.