Goodwill and Intangible Assets - Schedule of Goodwill Balances (Detail) $ in Millions	9 Months Ended
	Jun. 30, 2022 USD ($)
Goodwill And Intangible Assets [Line Items]
Beginning balance	$ 140
Foreign currency impact	(4)
Ending balance	136
Reinforcement Materials [Member]
Goodwill And Intangible Assets [Line Items]
Beginning balance	48
Foreign currency impact	(1)
Ending balance	47
Performance Chemicals [Member]
Goodwill And Intangible Assets [Line Items]
Beginning balance	92
Foreign currency impact	(3)
Ending balance	$ 89