Reportable Segment Information - Schedule of Information About Domestic and International Operations (Details) - USD ($) $ in Millions	12 Months Ended
	Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2020
Revenues from External Customers and Long-Lived Assets [Line Items]
Sales to external customers	$ 2,391	$ 2,111	$ 2,016
Net assets (liabilities)	3,220	2,752
Property, plant and equipment, net	1,338	1,427
United States [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Sales to external customers	731	637	623
Net assets (liabilities)	1,857	1,520
Property, plant and equipment, net	1,042	1,092
International [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Sales to external customers	1,660	1,474	$ 1,393
Net assets (liabilities)	1,363	1,232
Property, plant and equipment, net	$ 296	$ 335