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Restructuring Activities - Additional Information (Details) - USD ($) $ in Millions | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2018 | Sep. 30, 2018
Restructuring Cost And Reserve [Line Items] |  |
Restructuring reserve | $ 43 | $ 43
Severance Costs [Member] |  |
Restructuring Cost And Reserve [Line Items] |  |
Restructuring reserve | 32 | 36
Facility Costs [Member] |  |
Restructuring Cost And Reserve [Line Items] |  |
Restructuring reserve | 11 | 7
Restructuring costs | 7 |
Voluntary Severance Offer [Member] |  |
Restructuring Cost And Reserve [Line Items] |  |
Severance costs |  | $ 36
Voluntary Severance Offer [Member] | Selling, General and Administrative Expenses [Member] |  |
Restructuring Cost And Reserve [Line Items] |  |
Severance costs | 4 |
Plant Restructuring [Member] | Specialty Ingredients [Member] |  |
Restructuring Cost And Reserve [Line Items] |  |
Restructuring reserve | 8 |
Plant Restructuring [Member] | Severance Costs [Member] | Specialty Ingredients [Member] |  |
Restructuring Cost And Reserve [Line Items] |  |
Restructuring reserve | 5 |
Restructuring costs | 5 |
Plant Restructuring [Member] | Accelerated Depreciation and Amortization [Member] | Specialty Ingredients [Member] |  |
Restructuring Cost And Reserve [Line Items] |  |
Restructuring costs | 19 |
Plant Restructuring [Member] | Plant Closure Costs [Member] | Specialty Ingredients [Member] |  |
Restructuring Cost And Reserve [Line Items] |  |
Restructuring reserve | 3 |
Restructuring costs | 3 |
Plant Restructuring [Member] | Cost of Sales [Member] | Specialty Ingredients [Member] |  |
Restructuring Cost And Reserve [Line Items] |  |
Restructuring costs | $ 27 |

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- Definition Carrying amount (including both current and noncurrent portions of the accrual) as of the balance sheet date pertaining to a specified type of cost associated with exit from or disposal of business activities or restructuring pursuant to a duly authorized plan. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 420 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (b)(2) -URI http://asc.fasb.org/extlink&oid=6394359&loc=d3e17939-110869 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 420 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SAB TOPIC 5.P.4(b)) -URI http://asc.fasb.org/extlink&oid=115931487&loc=d3e140904-122747 + Details
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