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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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