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Revenue - Disaggregation of Revenue (Details) - USD ($) $ in Millions | 3 Months Ended
--- | ---
Dec. 31, 2018 | Dec. 31, 2017
Disaggregation Of Revenue [Line Items] |  |
Sales | $ 576 | $ 581
Specialty Ingredients [Member] |  |
Disaggregation Of Revenue [Line Items] |  |
Sales | 553 | 550
Intermediates and Solvents [Member] |  |
Disaggregation Of Revenue [Line Items] |  |
Sales | 23 | $ 31
North America [Member] | Specialty Ingredients [Member] |  |
Disaggregation Of Revenue [Line Items] |  |
Sales | 219 |
North America [Member] | Intermediates and Solvents [Member] |  |
Disaggregation Of Revenue [Line Items] |  |
Sales | 11 |
Europe [Member] | Specialty Ingredients [Member] |  |
Disaggregation Of Revenue [Line Items] |  |
Sales | 170 |
Europe [Member] | Intermediates and Solvents [Member] |  |
Disaggregation Of Revenue [Line Items] |  |
Sales | 5 |
Asia Pacific | Specialty Ingredients [Member] |  |
Disaggregation Of Revenue [Line Items] |  |
Sales | 116 |
Asia Pacific | Intermediates and Solvents [Member] |  |
Disaggregation Of Revenue [Line Items] |  |
Sales | 6 |
Latin America & Other [Member] | Specialty Ingredients [Member] |  |
Disaggregation Of Revenue [Line Items] |  |
Sales | 48 |
Latin America & Other [Member] | Intermediates and Solvents [Member] |  |
Disaggregation Of Revenue [Line Items] |  |
Sales | 1 |
Cellulosics [Member] | Specialty Ingredients [Member] |  |
Disaggregation Of Revenue [Line Items] |  |
Sales | 189 |
Poly-vinyl pyrrolidones [Member] | Specialty Ingredients [Member] |  |
Disaggregation Of Revenue [Line Items] |  |
Sales | 95 |
Adhesives [Member] | Specialty Ingredients [Member] |  |
Disaggregation Of Revenue [Line Items] |  |
Sales | 82 |
Actives [Member] | Specialty Ingredients [Member] |  |
Disaggregation Of Revenue [Line Items] |  |
Sales | 37 |
Vinyl Ethers [Member] | Specialty Ingredients [Member] |  |
Disaggregation Of Revenue [Line Items] |  |
Sales | 24 |
Other [Member] | Specialty Ingredients [Member] |  |
Disaggregation Of Revenue [Line Items] |  |
Sales | 67 |
Pharmachem [Member] | Specialty Ingredients [Member] |  |
Disaggregation Of Revenue [Line Items] |  |
Sales | 59 |
Derivatives [Member] | Intermediates and Solvents [Member] |  |
Disaggregation Of Revenue [Line Items] |  |
Sales | 20 |
Butanediol [Member] | Intermediates and Solvents [Member] |  |
Disaggregation Of Revenue [Line Items] |  |
Sales | $ 3 |

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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://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 -Subparagraph (a) -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 + Details
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