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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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Amount, after cash payment, of expenses associated with exit or disposal activities pursuant to an authorized plan. Excludes expenses related to a discontinued operation or an asset retirement obligation.

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-Publisher FASB
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-Topic 230
-SubTopic 10
-Section 45
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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.

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