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Discontinued Operations - Reconciliation of Consolidated Income (Loss) From Discontinued Operations (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Income (loss) from discontinued operations attributable to Composites/Marl facility
Income from discontinued operations	$ (13)	$ 43	$ (22)	$ 97
Composites/Marl facility [Member]
Income (loss) from discontinued operations attributable to Composites/Marl facility
Sales	10	281	38	840
Cost of sales	(6)	(215)	(26)	(648)
Selling, general and administrative expense	(2)	(20)	(5)	(61)
Research and development expense		(2)		(9)
Equity and other income			2	3
Pretax operating income of discontinued operations	2	44	9	125
Net interest and other financing expense		(6)		(18)
Pretax income of discontinued operations	2	38	9	107
Income tax expense	(1)	(14)	(4)	(30)
Income from discontinued operations	$ 1	$ 24	$ 5	$ 77

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