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Discontinued Operations - Components of Consolidated Comprehensive Income (Loss) Related to Discontinued Operations (Details) - USD ($) $ in Millions		12 Months Ended
		Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2017
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Income (loss) before taxes		$ 558	$ 105	$ 303
Income from discontinued operations (net of taxes)		481	95	208
Composites/Marl facility [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Income (loss) before taxes		118	103	98
Gain on disposal of discontinued operations		423
Benefit (expense) related to income (loss) from discontinued operations		(24)	(17)	(23)
Expense related to gain on disposal of discontinued operations		(51)
Income from discontinued operations (net of taxes)		94	86	75
Valvoline [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Income (loss) before taxes			(1)	240	[1]
Benefit (expense) related to income (loss) from discontinued operations	[1]			(81)
Income from discontinued operations (net of taxes)	[1]			159
Asbestos [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Income (loss) before taxes			14	(31)
Benefit (expense) related to income (loss) from discontinued operations			(1)	6
Water Technologies [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Income (loss) before taxes		(1)		1
Benefit (expense) related to income (loss) from discontinued operations		2	3	1
Distribution [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Income (loss) before taxes		18	(11)	(5)
Benefit (expense) related to income (loss) from discontinued operations		$ (4)	$ 5	$ 2
[1] Results in 2017 reflect activity through May 12, 2017 when Valvoline was fully separated, as previously discussed.

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