Goodwill and Intangible Assets - Schedule of Changes in Balances (Detail) $ in Millions	9 Months Ended
	Jun. 30, 2023 USD ($)
Goodwill And Intangible Assets [Line Items]
Beginning balance	$ 129
Foreign currency impact	7
Ending balance	136
Reinforcement Materials [Member]
Goodwill And Intangible Assets [Line Items]
Beginning balance	46
Foreign currency impact	6
Ending balance	52
Performance Chemicals [Member]
Goodwill And Intangible Assets [Line Items]
Beginning balance	83
Foreign currency impact	1
Ending balance	$ 84