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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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