Financial Information by Segment & Geographic Area - Schedule of Performance Segment (Detail) - Performance Chemicals [Member] - Operating Segments [Member] - USD ($) $ in Millions	12 Months Ended
	Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2020
Segment Reporting Information [Line Items]
Net sales	$ 1,372	$ 1,148	$ 933
Performance Additives [Member]
Segment Reporting Information [Line Items]
Net sales	1,013	796	645
Formulated Solutions [Member]
Segment Reporting Information [Line Items]
Net sales	$ 359	$ 352	$ 288