Other Noncurrent Assets and Liabilities - Components of Other Noncurrent Liabilities in Consolidated Balance Sheets (Details) - USD ($) $ in Millions	Sep. 30, 2022	Sep. 30, 2021
Other Liabilities, Noncurrent [Abstract]
Tax liabilities	$ 127	$ 145
Environmental remediation reserves	$ 157	$ 152
Environmental Loss Contingency, Noncurrent, Statement of Financial Position [Extensible Enumeration]	Other Liabilities, Noncurrent	Other Liabilities, Noncurrent
Deferred compensation	$ 25	$ 31
Other	16	21
Other noncurrent liabilities, Total	$ 325	$ 349