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		6 Months Ended
	Mar. 31, 2022	Mar. 31, 2021	Mar. 31, 2022	Mar. 31, 2021
Segment Reporting Information [Line Items]
Interest expense	$ (11)	$ (13)	$ (23)	$ (25)
Gain on bargain purchase of a business (Note C)	24		24
Loss on sale of business and asset impairment charge (Note D)	7		204
Unallocated and Other [Member]
Segment Reporting Information [Line Items]
Interest expense	(11)	(13)	(23)	(25)
Unallocated corporate costs	(16)	(16)	(30)	(29)
General unallocated income (expense)	(1)			(5)
Less: Equity in earnings of affiliated companies, net of tax	3	1	4	1
Income from continuing operations before income taxes and equity in earnings of affiliated companies	(24)	(31)	(254)	(72)
Certain Items [Member]
Segment Reporting Information [Line Items]
Gain on bargain purchase of a business (Note C)	24		24
Loss on sale of business and asset impairment charge (Note D)	(7)		(204)
Legal and environmental matters and reserves	(7)		(8)
Divestiture related charges	(1)		(5)
Acquisition and integration-related charges	(2)	(1)	(3)	(2)
Global restructuring activities		(1)	(2)	(4)
Employee benefit plan settlement and other charges		1		(5)
Other			1	(1)
Total certain items, pre-tax	$ 7	$ (1)	$ (197)	$ (12)