Goodwill and Intangible Assets (Tables)

12 Months Ended

Sep. 30, 2023

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 fiscal year ended September 30, 2023 are as follows

	Reinforcement Materials		Performance Chemicals		Total
	(In millions)
Balance at September 30, 2022	$	46	$	83	$	129
Foreign currency impact		5		—		5
Balance at September 30, 2023	$	51	$	83	$	134

Schedule of Intangible Assets with Finite Lives

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

	September 30, 2023							September 30, 2022
	Gross Carrying Value		Accumulated Amortization			Net Intangible Assets		Gross Carrying Value		Accumulated Amortization			Net Intangible Assets
	(In millions)
Developed technologies	$	34	$	(10	)	$	24	$	34	$	(8	)	$	26
Trademarks		2		(1	)		1		2		(1	)		1
Customer relationships		65		(30	)		35		59		(23	)		36
Total intangible assets	$	101	$	(41	)	$	60	$	95	$	(32	)	$	63