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Reportable Segment Information - Summary of Financial Information for Each Reportable Segment (Details) - USD ($) $ in Millions	3 Months Ended
	Dec. 31, 2018	Dec. 31, 2017
Segment Reporting Information [Line Items]
Sales	$ 576	$ 581
Operating Income (Loss)	(7)	5
Specialty Ingredients [Member]
Segment Reporting Information [Line Items]
Sales	553	550
Operating Income (Loss)	26	42
Intermediates and Solvents [Member]
Segment Reporting Information [Line Items]
Sales	23	31
Operating Income (Loss)		3
Unallocated and other [Member]
Segment Reporting Information [Line Items]
Operating Income (Loss)	$ (33)	$ (40)

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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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-URI http://asc.fasb.org/extlink&oid=109196051&loc=SL49130543-203045

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-Name Accounting Standards Codification
-Topic 606
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-Paragraph 5
-URI http://asc.fasb.org/extlink&oid=109196051&loc=SL49130545-203045

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