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Revenue - Disaggregation of Revenue (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Disaggregation Of Revenue [Line Items]
Sales	$ 641	$ 668	$ 1,884	$ 1,922
Specialty Ingredients [Member]
Disaggregation Of Revenue [Line Items]
Sales	613	638	1,803	1,834
Intermediates and Solvents [Member]
Disaggregation Of Revenue [Line Items]
Sales	28	30	81	88
North America [Member] | Specialty Ingredients [Member]
Disaggregation Of Revenue [Line Items]
Sales	246	253	712	733
North America [Member] | Intermediates and Solvents [Member]
Disaggregation Of Revenue [Line Items]
Sales	15	14	42	42
Europe [Member] | Specialty Ingredients [Member]
Disaggregation Of Revenue [Line Items]
Sales	204	208	594	597
Europe [Member] | Intermediates and Solvents [Member]
Disaggregation Of Revenue [Line Items]
Sales	5	6	16	19
Asia Pacific | Specialty Ingredients [Member]
Disaggregation Of Revenue [Line Items]
Sales	117	121	348	339
Asia Pacific | Intermediates and Solvents [Member]
Disaggregation Of Revenue [Line Items]
Sales	7	9	20	23
Latin America & Other [Member] | Specialty Ingredients [Member]
Disaggregation Of Revenue [Line Items]
Sales	46	56	149	165
Latin America & Other [Member] | Intermediates and Solvents [Member]
Disaggregation Of Revenue [Line Items]
Sales	1	1	3	4
Cellulosics [Member] | Specialty Ingredients [Member]
Disaggregation Of Revenue [Line Items]
Sales	219	223	633	616
Poly-vinyl pyrrolidones [Member] | Specialty Ingredients [Member]
Disaggregation Of Revenue [Line Items]
Sales	108	110	312	320
Adhesives [Member] | Specialty Ingredients [Member]
Disaggregation Of Revenue [Line Items]
Sales	88	90	259	259
Actives [Member] | Specialty Ingredients [Member]
Disaggregation Of Revenue [Line Items]
Sales	36	36	116	116
Vinyl Ethers [Member] | Specialty Ingredients [Member]
Disaggregation Of Revenue [Line Items]
Sales	25	39	80	106
Pharmachem [Member] | Specialty Ingredients [Member]
Disaggregation Of Revenue [Line Items]
Sales	59	55	182	176
Derivatives [Member] | Intermediates and Solvents [Member]
Disaggregation Of Revenue [Line Items]
Sales	22	25	67	73
Butanediol [Member] | Intermediates and Solvents [Member]
Disaggregation Of Revenue [Line Items]
Sales	6	5	14	15
Other [Member] | Specialty Ingredients [Member]
Disaggregation Of Revenue [Line Items]
Sales	$ 78	$ 85	$ 221	$ 241

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+ References

No definition available.

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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.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
-SubTopic 10
-Section 50
-Paragraph 4
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=109196051&loc=SL49130543-203045

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
-SubTopic 10
-Section 50
-Paragraph 1
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-URI http://asc.fasb.org/extlink&oid=109196051&loc=SL49130539-203045

Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
-SubTopic 10
-Section 50
-Paragraph 5
-URI http://asc.fasb.org/extlink&oid=109196051&loc=SL49130545-203045

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