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Other Noncurrent Assets and Liabilities - Components of Other Noncurrent Assets in Consolidated Balance Sheets (Details) - USD ($) $ in Millions | Sep. 30, 2019 | Sep. 30, 2018
--- | --- | ---
Other Assets Noncurrent [Abstract] |  |
Deferred compensation investments | $ 170 | $ 165
Tax and tax indemnity receivables | 68 | 74
Life insurance policies | 56 | 52
Manufacturing catalyst supplies | 38 | 35
Defined benefit plan assets | 33 | 35
Equity and other unconsolidated investments | 6 | 8
Land use rights | 6 | 11
Environmental insurance receivables | 12 | 11
Debt issuance costs | 4 | 6
Other | 17 | 19
Other noncurrent assets, Total | $ 410 | $ 416

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