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Restructuring Activities - Additional Information (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Sep. 30, 2019 | Sep. 30, 2018
Restructuring Cost And Reserve [Line Items] |  |
Restructuring reserve | $ 14 | $ 43
Asset impairment charges | 8 | 16
Severance Costs [Member] |  |
Restructuring Cost And Reserve [Line Items] |  |
Restructuring reserve | 7 | 36
Facility Costs [Member] |  |
Restructuring Cost And Reserve [Line Items] |  |
Restructuring reserve | 7 | 7
Restructuring costs | 7 | 9
Selling, General and Administrative Expenses [Member] |  |
Restructuring Cost And Reserve [Line Items] |  |
Asset impairment charges |  | 16
Selling, General and Administrative Expenses [Member] | Facility Costs [Member] |  |
Restructuring Cost And Reserve [Line Items] |  |
Asset impairment charges |  | 12
Voluntary Severance Offer [Member] | Selling, General and Administrative Expenses [Member] |  |
Restructuring Cost And Reserve [Line Items] |  |
Severance costs | 6 | $ 36
Plant Restructuring [Member] | Severance Costs [Member] | Specialty Ingredients [Member] |  |
Restructuring Cost And Reserve [Line Items] |  |
Restructuring costs | 5 |
Plant Restructuring [Member] | Accelerated Depreciation And Amortization | Specialty Ingredients [Member] |  |
Restructuring Cost And Reserve [Line Items] |  |
Restructuring costs | 38 |
Plant Restructuring [Member] | Plant Closure Costs [Member] | Specialty Ingredients [Member] |  |
Restructuring Cost And Reserve [Line Items] |  |
Restructuring reserve | 2 |
Restructuring costs | 4 |
Plant Restructuring [Member] | Cost of Sales [Member] | Specialty Ingredients [Member] |  |
Restructuring Cost And Reserve [Line Items] |  |
Restructuring costs | $ 47 |

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- Definition Amount of write-down of assets recognized in the income statement. Includes, but is not limited to, losses from tangible assets, intangible assets and goodwill. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=118932676&loc=d3e3602-108585 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 360 -SubTopic 10 -Section 45 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=109226348&loc=d3e2420-110228 + Details
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