Goodwill and Intangible Assets

6 Months Ended

Mar. 31, 2023

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 six months ended March 31, 2023 are as follows:


	Reinforcement Materials		Performance Chemicals		Total
	(In millions)
Balance at September 30, 2022	$	46	$	83	$	129
Foreign currency impact		4		3		7
Balance at March 31, 2023	$	50	$	86	$	136

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


	March 31, 2023							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	$	(9	)		25	$	34	$	(8	)	$	26
Trademarks		2		(1	)		1		2		(1	)		1
Customer relationships		64		(27	)		37		59		(23	)		36
Total intangible assets	$	100	$	(37	)	$	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 $2 million and $1 million for the three months ended March 31, 2023 and 2022, respectively. Amortization expense for each of the six months ended March 31, 2023 and 2022 was $3 million. 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.