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Other Noncurrent Assets and Liabilities - Components of Other Noncurrent Liabilities in Consolidated Balance Sheets (Details) - USD ($)
$ in Millions
Sep. 30, 2021
Sep. 30, 2020
Other Liabilities Noncurrent [Abstract]    
Tax liabilities $ 145 $ 214
Environmental remediation reserves 152 150
Deferred compensation 31 32
Other 21 36
Other noncurrent liabilities, Total $ 349 $ 432