Financial Information by Segment - Schedule of Performance Segment (Detail) - Performance Chemicals [Member] - Operating Segments [Member] - USD ($) $ in Millions	3 Months Ended
	Dec. 31, 2020	Dec. 31, 2019
Segment Reporting Information [Line Items]
Net sales	$ 267	$ 242
Performance Additives [Member]
Segment Reporting Information [Line Items]
Net sales	184	170
Formulated Solutions [Member]
Segment Reporting Information [Line Items]
Net sales	$ 83	$ 72