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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, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Income (loss) from discontinued operations attributable to Composites/Marl facility
Income from discontinued operations	$ 43	$ 25	$ 97	$ 83
Composites/Marl facility [Member]
Income (loss) from discontinued operations attributable to Composites/Marl facility
Sales	281	303	840	865
Cost of sales	(215)	(242)	(648)	(703)
Selling, general and administrative expense	(20)	(22)	(61)	(55)
Research and development expense	(2)	(3)	(9)	(9)
Equity and other income			3	4
Pretax operating income of discontinued operations	44	36	125	102
Net interest and other expense	(6)	(5)	(18)	(15)
Pretax income of discontinued operations	38	31	107	87
Income tax expense	(14)	(6)	(30)	(13)
Income from discontinued operations	$ 24	$ 25	$ 77	$ 74

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