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Reportable Segment Information - Summary of Financial Information for Each Reportable Segment (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Segment Reporting Information [Line Items]
Sales	$ 971	$ 870	$ 2,787	$ 2,380
Operating Income (Loss)	66	37	200	105
Specialty Ingredients [Member]
Segment Reporting Information [Line Items]
Sales	638	591	1,834	1,617
Operating Income (Loss)	91	58	222	172
Composites [Member]
Segment Reporting Information [Line Items]
Sales	250	209	706	561
Operating Income (Loss)	22	22	59	50
Intermediates and Solvents [Member]
Segment Reporting Information [Line Items]
Sales	83	70	247	202
Operating Income (Loss)	9	2	22	(8)
Unallocated and other [Member]
Segment Reporting Information [Line Items]
Operating Income (Loss)	$ (56)	$ (45)	$ (103)	$ (109)

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The net result for the period of deducting operating expenses from operating revenues.

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Amount, excluding tax collected from customer, of revenue from satisfaction of performance obligation by transferring promised good or service to customer. Tax collected from customer is tax assessed by governmental authority that is both imposed on and concurrent with specific revenue-producing transaction, including, but not limited to, sales, use, value added and excise.

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Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
-SubTopic 10
-Section 50
-Paragraph 4
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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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