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Divestitures - Additional Information (Details) - USD ($) $ in Millions |  |  | 1 Months Ended | 12 Months Ended |
--- | --- | --- | --- | --- | ---
Aug. 30, 2019 | Jul. 31, 2019 | Sep. 30, 2019 | Sep. 30, 2019 | Sep. 30, 2018 | Sep. 30, 2017 | Sep. 30, 2016 | Nov. 15, 2018
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |
Stranded divestitures costs |  |  |  | $ 41 | $ 46 | $ 36 |  |
Restructuring and related cost, accelerated depreciation |  |  |  |  |  | 13 |  |
Restructuring charges |  |  |  |  |  | 1 |  |
Net loss on divestitures |  |  |  | (2) | (4) | (10) |  |
Impairment charge |  |  |  | 5 |  |  |  |
Property, plant and equipment |  |  | $ 1,577 | 1,577 | 1,646 |  |  |
Composites Segment and the Intermediates and Solvents Marl Facility [Member] |  |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |
Retired debt |  |  |  | 900 |  |  |  |
Gain on divestitures after-tax recognized in comprehensive income (loss) |  |  |  | 372 |  |  |  |
Composites Segment and the Intermediates and Solvents Marl Facility [Member] | Land and Buildings [Member] |  |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |
Property, plant and equipment |  |  | 6 | $ 6 | 9 |  |  |
Composites Segment and the Intermediates and Solvents Marl Facility [Member] | INEOS Enterprises [Member] |  |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |
Transaction value in sale of business |  |  |  |  |  |  |  | $ 1,100
Adjusted purchase price from additional proposed changes to sale agreement |  | $ 1,015 |  |  |  |  |  |
Net proceeds from sale of business | $ 1,000 |  |  |  |  |  |  |
Transition service fees recognized |  |  | $ 1 |  |  |  |  |
Specialty Ingredients Facility [Member] | Specialty Ingredients [Member] |  |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |
Net loss on divestitures |  |  |  |  | $ (2) |  |  |
Specialty Ingredients Joint Venture [Member] | Specialty Ingredients [Member] |  |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |
Net loss on divestitures |  |  |  |  |  | $ (4) | $ (12) |

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