Financial Information by Segment - Schedule of Income (Loss) from Continuing Operations before Income Taxes and Equity in Earnings of Affiliated Companies for Unallocated and Other (Detail) - USD ($) $ in Millions	3 Months Ended
	Dec. 31, 2021	Dec. 31, 2020
Segment Reporting Information [Line Items]
Interest expense	$ (12)	$ (12)
Purification Solutions assets held for sale impairment charge (Note D)	(197)
Global restructuring activities	(2)	(3)
Unallocated and Other [Member]
Segment Reporting Information [Line Items]
Interest expense	(12)	(12)
Unallocated corporate costs	(14)	(13)
General unallocated income (expense)	1	(5)
Less: Equity in earnings of affiliated companies, net of tax	1
Income from continuing operations before income taxes and equity in earnings of affiliated companies	(230)	(41)
Certain Items [Member]
Segment Reporting Information [Line Items]
Purification Solutions assets held for sale impairment charge (Note D)	(197)
Divestiture related charges	(4)
Global restructuring activities	(2)	(3)
Legal and environmental matters and reserves	(1)
Acquisition and integration-related charges	(1)	(1)
Employee benefit plan settlement and other charges		(6)
Other	1	(1)
Total certain items, pre-tax	$ (204)	$ (11)