Reportable Segment Information - Financial Information by Segment (Details) - USD ($) $ in Millions	12 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2019
Segment Reporting Information [Line Items]
Sales	$ 2,981	$ 2,353	$ 2,390
Adjusted EBITDA	634	495	478
Net interest and other financing expenses	(111)	(93)	(73)
Net pension and other postretirement plan (income) expenses	(126)	(59)	60
Net legacy and separation-related (income) expenses	(24)	(30)	3
Compensated absences benefits change	0	11	0
Income (Loss) from Continuing Operations before Equity Method Investments, Income Taxes, Noncontrolling Interest	543	451	265
Retail Services [Member]
Segment Reporting Information [Line Items]
Sales	1,221	883	822
Global Products [Member]
Segment Reporting Information [Line Items]
Sales	1,760	1,470	1,568
Operating Segments
Segment Reporting Information [Line Items]
Adjusted EBITDA	709	556	535
Net interest and other financing expenses	(111)	(93)	(73)
Other Depreciation and Amortization	(92)	(66)	(61)
Net pension and other postretirement plan (income) expenses	126	59	(60)
Net legacy and separation-related (income) expenses	24	30	(3)
Inventory, LIFO Reserve, Period Charge	(41)	15	0
Business interruption recovery (expenses)	3	2	(6)
Acquisition and divestiture-related (costs) income	0	(2)	4
Restructuring and Related Cost, Incurred Cost	0	0	(14)
Operating Segments | Retail Services [Member]
Segment Reporting Information [Line Items]
Sales	1,221	883	822
Adjusted EBITDA	382	247	239
Operating Segments | Global Products [Member]
Segment Reporting Information [Line Items]
Sales	1,760	1,470	1,568
Adjusted EBITDA	327	309	296
Corporate, Non-Segment
Segment Reporting Information [Line Items]
Adjusted EBITDA	$ (75)	$ (61)	$ (57)