Goodwill and Intangible Assets

3 Months Ended

Dec. 31, 2022

Goodwill And Intangible Assets Disclosure [Abstract]

E. Goodwill and Intangible Assets

The carrying amount of goodwill attributable to each reportable segment and the changes in those balances during the three months ended December 31, 2022 are as follows:


	Reinforcement Materials		Performance Chemicals		Total
	(In millions)
Balance at September 30, 2022	$	46	$	83	$	129
Foreign currency impact		2		2		4
Balance at December 31, 2022	$	48	$	85	$	133

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


	December 31, 2022							September 30, 2022
	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	$	34	$	(8	)		26	$	34	$	(8	)	$	26
Trademarks		2		(1	)		1		2		(1	)		1
Customer relationships		61		(25	)		36		59		(23	)		36
Total intangible assets	$	97	$	(34	)	$	63	$	95	$	(32	)	$	63

Intangible assets are amortized over their estimated useful lives, which range between ten and twenty-five years, with a weighted average amortization period of approximately seventeen years. Amortization expense was $1 million and $2 million for the three months ended December 31, 2022 and 2021, respectively. Amortization expense 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.