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Restructuring Activities - Additional Information (Details) - USD ($)	3 Months Ended		9 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019	Sep. 30, 2019	Sep. 30, 2018
Restructuring Cost And Reserve [Line Items]
Restructuring reserve	$ 6,000,000	$ 22,000,000	$ 6,000,000	$ 22,000,000	$ 14,000,000	$ 43,000,000
Severance Costs [Member]
Restructuring Cost And Reserve [Line Items]
Restructuring reserve	0	14,000,000	0	14,000,000	7,000,000	36,000,000
Facility Costs [Member]
Restructuring Cost And Reserve [Line Items]
Restructuring reserve	6,000,000	8,000,000	6,000,000	8,000,000	7,000,000	$ 7,000,000
Restructuring costs	0	0	0	8,000,000
Fiscal 2020 Restructuring Severance Costs [Member]
Restructuring Cost And Reserve [Line Items]
Severance costs	12,000,000		30,000,000
Restructuring reserve	22,000,000		22,000,000		$ 0
Voluntary Severance Offer [Member] | Selling, General and Administrative Expenses [Member]
Restructuring Cost And Reserve [Line Items]
Severance costs	0	3,000,000	1,000,000	7,000,000
Fiscal 2019 Plant Restructuring [Member] | Specialty Additives [Member]
Restructuring Cost And Reserve [Line Items]
Restructuring reserve	$ 0		$ 0
Fiscal 2019 Plant Restructuring [Member] | Severance Costs [Member] | Specialty Additives [Member]
Restructuring Cost And Reserve [Line Items]
Restructuring costs				5,000,000
Fiscal 2019 Plant Restructuring [Member] | Accelerated Depreciation and Amortization [Member] | Specialty Additives [Member]
Restructuring Cost And Reserve [Line Items]
Restructuring costs				38,000,000
Fiscal 2019 Plant Restructuring [Member] | Plant Closure Costs [Member] | Specialty Additives [Member]
Restructuring Cost And Reserve [Line Items]
Restructuring costs				4,000,000
Fiscal 2019 Plant Restructuring [Member] | Cost of Sales [Member] | Specialty Additives [Member]
Restructuring Cost And Reserve [Line Items]
Restructuring costs		$ 0		$ 47,000,000

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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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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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Amount of expenses for special or contractual termination benefits provided to current employees involuntarily terminated under a benefit arrangement associated exit or disposal activities pursuant to an authorized plan. Excludes expenses related to one-time termination benefits, a discontinued operation or an asset retirement obligation.

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