Financial Information by Segment - Schedule of Performance Segment (Detail) - Performance Chemicals [Member] - Operating Segments [Member] - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Segment Reporting Information [Line Items]
Net sales	$ 303	$ 220	$ 864	$ 707
Performance Additives [Member]
Segment Reporting Information [Line Items]
Net sales	208	151	595	489
Formulated Solutions [Member]
Segment Reporting Information [Line Items]
Net sales	$ 95	$ 69	$ 269	$ 218