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Restructuring Activities - Additional Information (Details) - USD ($) | 3 Months Ended | 9 Months Ended
--- | --- | ---
Jun. 30, 2019 | Sep. 30, 2018 | Jun. 30, 2018 | Jun. 30, 2019 | Jun. 30, 2018
Restructuring Cost And Reserve [Line Items] |  |  |  |  |
Restructuring reserve | $ 22,000,000 | $ 43,000,000 |  | $ 22,000,000 |
Severance Costs [Member] |  |  |  |  |
Restructuring Cost And Reserve [Line Items] |  |  |  |  |
Restructuring costs |  |  | $ 0 |  | $ 0
Restructuring reserve | 14,000,000 | 36,000,000 |  | 14,000,000 |
Facility Costs [Member] |  |  |  |  |
Restructuring Cost And Reserve [Line Items] |  |  |  |  |
Restructuring costs | 0 |  | $ 8,000,000 | 8,000,000 | $ 8,000,000
Restructuring reserve | 8,000,000 | 7,000,000 |  | 8,000,000 |
Voluntary Severance Offer [Member] |  |  |  |  |
Restructuring Cost And Reserve [Line Items] |  |  |  |  |
Severance costs |  | $ 36,000,000 |  |  |
Voluntary Severance Offer [Member] | Selling, General and Administrative Expenses [Member] |  |  |  |  |
Restructuring Cost And Reserve [Line Items] |  |  |  |  |
Severance costs | 3,000,000 |  |  | 7,000,000 |
Plant Restructuring [Member] | Severance Costs [Member] | Specialty Ingredients [Member] |  |  |  |  |
Restructuring Cost And Reserve [Line Items] |  |  |  |  |
Restructuring costs |  |  |  | 5,000,000 |
Restructuring reserve | 1,000,000 |  |  | 1,000,000 |
Plant Restructuring [Member] | Accelerated Depreciation and Amortization [Member] | Specialty Ingredients [Member] |  |  |  |  |
Restructuring Cost And Reserve [Line Items] |  |  |  |  |
Restructuring costs |  |  |  | 38,000,000 |
Plant Restructuring [Member] | Plant Closure Costs [Member] | Specialty Ingredients [Member] |  |  |  |  |
Restructuring Cost And Reserve [Line Items] |  |  |  |  |
Restructuring costs |  |  |  | 4,000,000 |
Restructuring reserve | 2,000,000 |  |  | 2,000,000 |
Plant Restructuring [Member] | Cost of Sales [Member] | Specialty Ingredients [Member] |  |  |  |  |
Restructuring Cost And Reserve [Line Items] |  |  |  |  |
Restructuring costs | $ 0 |  |  | $ 47,000,000 |

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