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Divestitures - Additional Information (Details) - USD ($) $ in Millions		3 Months Ended		9 Months Ended
	Aug. 30, 2019	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Stranded divestitures costs		$ 0	$ 10	$ 0	$ 33
Composites Segment and the Intermediates and Solvents Facility [Member] | INEOS Enterprises [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Net proceeds from sale of business	$ 1,015
Transition service fee income recognized		$ 3		$ 9

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- Definition

Represents the amount of costs that were previously allocated to the Composites segment and Marl facility but have been reclassified to the Unallocated and Other Segment.

+ References

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- Definition

Transition service fee income.

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- Definition

The cash inflow associated with the amount received from the sale of a portion of the company's business, for example a segment, division, branch or other business, during the period.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 12
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=118932676&loc=d3e3179-108585

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