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Revenue - Disaggregation of Revenue (Details) - USD ($) $ in Millions		3 Months Ended
		Dec. 31, 2019	Dec. 31, 2018
Disaggregation Of Revenue [Line Items]
Sales		$ 533	$ 576
Specialty Ingredients [Member]
Disaggregation Of Revenue [Line Items]
Sales		505	553
Intermediates and Solvents [Member]
Disaggregation Of Revenue [Line Items]
Sales		28	23
North America [Member] | Specialty Ingredients [Member]
Disaggregation Of Revenue [Line Items]
Sales		198	219
North America [Member] | Intermediates and Solvents [Member]
Disaggregation Of Revenue [Line Items]
Sales		15	11
Europe [Member] | Specialty Ingredients [Member]
Disaggregation Of Revenue [Line Items]
Sales		161	170
Europe [Member] | Intermediates and Solvents [Member]
Disaggregation Of Revenue [Line Items]
Sales		5	5
Asia Pacific [Member] | Specialty Ingredients [Member]
Disaggregation Of Revenue [Line Items]
Sales		103	116
Asia Pacific [Member] | Intermediates and Solvents [Member]
Disaggregation Of Revenue [Line Items]
Sales		7	6
Latin America & Other [Member] | Specialty Ingredients [Member]
Disaggregation Of Revenue [Line Items]
Sales		43	48
Latin America & Other [Member] | Intermediates and Solvents [Member]
Disaggregation Of Revenue [Line Items]
Sales		1	1
Cellulosics [Member] | Specialty Ingredients [Member]
Disaggregation Of Revenue [Line Items]
Sales		178	189
Poly-vinyl pyrrolidones [Member] | Specialty Ingredients [Member]
Disaggregation Of Revenue [Line Items]
Sales		93	95
Adhesives [Member] | Specialty Ingredients [Member]
Disaggregation Of Revenue [Line Items]
Sales		74	82
Actives [Member] | Specialty Ingredients [Member]
Disaggregation Of Revenue [Line Items]
Sales		37	37
Vinyl Ethers [Member] | Specialty Ingredients [Member]
Disaggregation Of Revenue [Line Items]
Sales		20	24
Pharmachem [Member] | Specialty Ingredients [Member]
Disaggregation Of Revenue [Line Items]
Sales		40	59
Other [Member] | Specialty Ingredients [Member]
Disaggregation Of Revenue [Line Items]
Sales	[1]	63	67
Derivatives [Member] | Intermediates and Solvents [Member]
Disaggregation Of Revenue [Line Items]
Sales		23	20
Butanediol [Member] | Intermediates and Solvents [Member]
Disaggregation Of Revenue [Line Items]
Sales		$ 5	$ 3
[1] Other includes no product category in excess of 10% of sales

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+ References

No definition available.

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- Definition

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://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
-SubTopic 10
-Section 50
-Paragraph 4
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=118956577&loc=SL49130543-203045

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
-SubTopic 10
-Section 50
-Paragraph 5
-URI http://asc.fasb.org/extlink&oid=118956577&loc=SL49130545-203045

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