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Discontinued Operations - Reconciliation of Consolidated Income (Loss) From Discontinued Operations (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Sep. 30, 2019 | Sep. 30, 2018 | Sep. 30, 2017
Income(loss) from discontinued operations attributable to Composites/Marl facility disposal group |  |  |  |  |
Pretax income of discontinued operations |  | $ 558 | $ 105 | $ 303 |
Income from discontinued operations |  | 481 | 95 | 208 |
Composites/Marl facility [Member] |  |  |  |  |
Income(loss) from discontinued operations attributable to Composites/Marl facility disposal group |  |  |  |  |
Sales |  | 1,012 | 1,154 | 951 |
Cost of sales |  | (785) | (942) | (783) |
Selling, general and administrative expense |  | (74) | (79) | (65) |
Research and development expense |  | (11) | (12) | (10) |
Equity and other income |  | 3 | 4 | 4 |
Pretax operating income of discontinued operations |  | 145 | 125 | 97 |
Net interest and other financing expense |  | (21) | (20) | (5) |
Other net periodic benefit income (costs) |  | (6) | (2) | 2 |
Net gain on acquisitions and divestitures |  |  |  | 4 |
Pretax income of discontinued operations |  | 118 | 103 | 98 |
Benefit (expense) related to income (loss) from discontinued operations |  | (24) | (17) | (23) |
Income from discontinued operations |  | $ 94 | 86 | 75 |
Valvoline [Member] |  |  |  |  |
Income(loss) from discontinued operations attributable to Composites/Marl facility disposal group |  |  |  |  |
Sales | [1] |  |  | 1,237 |
Cost of sales | [1] |  |  | (750) |
Selling, general and administrative expense | [1] |  |  | (234) |
Research and development expense | [1] |  |  | (8) |
Equity and other income | [1] |  |  | 17 |
Pretax operating income of discontinued operations | [1] |  |  | 262 |
Net interest and other financing expense | [1] |  |  | (22) |
Pretax income of discontinued operations |  |  | $ (1) | 240 | [1]
Benefit (expense) related to income (loss) from discontinued operations | [1] |  |  | (81) |
Income from discontinued operations | [1] |  |  | $ 159 |
[1] | Results in 2017 reflect activity through May 12, 2017 when Valvoline was fully separated, as previously discussed.

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- Definition Amount before tax of income (loss) from a discontinued operation. Includes, but is not limited to, the income (loss) from operations during the phase-out period, gain (loss) on disposal, gain (loss) for reversal of write-down (write-down) to fair value, less cost to sell, and adjustments to a prior period gain (loss) on disposal. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 205 -SubTopic 20 -Section 50 -Paragraph 5B -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=109222650&loc=SL51721673-107760 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 205 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=109222650&loc=d3e1361-107760 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 205 -SubTopic 20 -Section 45 -Paragraph 3A -URI http://asc.fasb.org/extlink&oid=109222160&loc=SL51721523-107759 Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 205 -SubTopic 20 -Section 45 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=109222160&loc=d3e1012-107759 Reference 5: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 220 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-04(12)) -URI http://asc.fasb.org/extlink&oid=116637232&loc=SL114874131-224263 Reference 6: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 205 -SubTopic 20 -Section 45 -Paragraph 3B -URI http://asc.fasb.org/extlink&oid=109222160&loc=SL51721525-107759 Reference 7: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 205 -SubTopic 20 -Section 45 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=109222160&loc=d3e957-107759 Reference 8: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03(14)) -URI http://asc.fasb.org/extlink&oid=116634182&loc=SL114868664-224227 + Details
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