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Restructuring Activities - Additional Information (Details) - USD ($) | 3 Months Ended |  |
--- | --- | --- | ---
Dec. 31, 2019 | Dec. 31, 2018 | Sep. 30, 2019 | Sep. 30, 2018
Restructuring Cost And Reserve [Line Items] |  |  |  |
Restructuring reserve | $ 11,000,000 | $ 43,000,000 | $ 14,000,000 | $ 43,000,000
Severance Costs [Member] |  |  |  |
Restructuring Cost And Reserve [Line Items] |  |  |  |
Restructuring reserve | 5,000,000 | 32,000,000 | 7,000,000 | 36,000,000
Facility Costs [Member] |  |  |  |
Restructuring Cost And Reserve [Line Items] |  |  |  |
Restructuring reserve | 6,000,000 | 11,000,000 | $ 7,000,000 | $ 7,000,000
Restructuring costs | 0 | 7,000,000 |  |
Executive Transition Severance Costs [Member] |  |  |  |
Restructuring Cost And Reserve [Line Items] |  |  |  |
Severance costs | 3,000,000 |  |  |
Restructuring reserve | 3,000,000 |  |  |
Voluntary Severance Offer [Member] | Selling, General and Administrative Expenses [Member] |  |  |  |
Restructuring Cost And Reserve [Line Items] |  |  |  |
Severance costs | 1,000,000 | 4,000,000 |  |
Plant Restructuring [Member] | Specialty Ingredients [Member] |  |  |  |
Restructuring Cost And Reserve [Line Items] |  |  |  |
Restructuring reserve | $ 0 |  |  |
Plant Restructuring [Member] | Severance Costs [Member] | Specialty Ingredients [Member] |  |  |  |
Restructuring Cost And Reserve [Line Items] |  |  |  |
Restructuring costs |  | 5,000,000 |  |
Plant Restructuring [Member] | Accelerated Depreciation and Amortization [Member] | Specialty Ingredients [Member] |  |  |  |
Restructuring Cost And Reserve [Line Items] |  |  |  |
Restructuring costs |  | 19,000,000 |  |
Plant Restructuring [Member] | Plant Closure Costs [Member] | Specialty Ingredients [Member] |  |  |  |
Restructuring Cost And Reserve [Line Items] |  |  |  |
Restructuring costs |  | 3,000,000 |  |
Plant Restructuring [Member] | Cost of Sales [Member] | Specialty Ingredients [Member] |  |  |  |
Restructuring Cost And Reserve [Line Items] |  |  |  |
Restructuring costs |  | $ 27,000,000 |  |

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