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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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