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Divestitures - Additional Information (Details) - USD ($) $ in Millions |  |  | 3 Months Ended | 9 Months Ended |  |
--- | --- | --- | --- | --- | --- | ---
Jul. 31, 2019 | Jul. 01, 2019 | Jun. 30, 2019 | Jun. 30, 2018 | Jun. 30, 2019 | Jun. 30, 2018 | Nov. 15, 2018 | Sep. 30, 2018
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |
Stranded divestitures costs |  |  | $ 10 | $ 12 | $ 33 | $ 35 |  |
Property, plant and equipment |  |  | 1,580 |  | 1,580 |  |  | $ 1,646
Impairment charge |  |  |  |  | 5 |  |  |
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] | Minimum [Member] |  |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |
Gain on divestitures pre-tax expected to recognize in comprehensive income (loss) |  |  |  |  | $ 400 |  |  |
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 |
Composites Segment and the Intermediates and Solvents Marl Facility [Member] | INEOS Enterprises [Member] | Subsequent Event [Member] |  |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |
Expected net proceeds from sale of business | $ 900 |  |  |  |  |  |  |
Adjusted purchase price from additional proposed changes to sale agreement | $ 1,015 |  |  |  |  |  |  |
Composites Segment and the Intermediates and Solvents Marl Facility [Member] | INEOS Enterprises [Member] | Subsequent Event [Member] | Maximum [Member] |  |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |
Expected net proceeds from sale of business |  | $ 35 |  |  |  |  |  |
Reimbursement of divestiture, unable to sell business |  | $ 35 |  |  |  |  |  |
Duration to sell the business |  | 18 months |  |  |  |  |  |

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