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Property, Plant and Equipment - Additional Information (Details) - USD ($) $ in Millions	12 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2017
Property Plant And Equipment [Line Items]
Accelerated depreciation			$ 13
Selling, General and Administrative Expenses [Member] | Unallocated and other [Member]
Property Plant And Equipment [Line Items]
Accelerated depreciation	$ 1	$ 8	5
Machinery and Equipment [Member]
Property Plant And Equipment [Line Items]
Accelerated depreciation	$ 38
Machinery and Equipment [Member] | Equity and Other Income (Expense) [Member] | Specialty Solutions [Member]
Property Plant And Equipment [Line Items]
Accelerated depreciation		$ 6	1
Machinery and Equipment [Member] | Cost of Sales [Member] | Functional Materials [Member]
Property Plant And Equipment [Line Items]
Accelerated depreciation			$ 13

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- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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- Definition

Amount of accelerated depreciation charged against earnings associated with exit from or disposal of business activities or restructuring plan.

+ References

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