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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, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Segment Reporting Information [Line Items]
Sales	$ 641	$ 668	$ 1,884	$ 1,922
Operating Income (Loss)	43	30	80	98
Specialty Ingredients [Member]
Segment Reporting Information [Line Items]
Sales	613	638	1,803	1,834
Operating Income (Loss)	84	91	180	222
Intermediates and Solvents [Member]
Segment Reporting Information [Line Items]
Sales	28	30	81	88
Operating Income (Loss)	5	5	10	11
Unallocated and other [Member]
Segment Reporting Information [Line Items]
Operating Income (Loss)	$ (46)	$ (66)	$ (110)	$ (135)

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

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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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