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Other Noncurrent Assets and Liabilities - Components of Other Noncurrent Liabilities in Consolidated Balance Sheets (Details) - USD ($)
$ in Millions
Sep. 30, 2019
Sep. 30, 2018
Other Liabilities Noncurrent [Abstract]    
Tax liabilities $ 220 $ 176
Environmental remediation reserves 143 147
Deferred compensation 42 47
Other 48 52
Other noncurrent liabilities, Total $ 453 $ 422