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Litigation, Claims and Contingencies - Schedule of Progression of Activity in the Asbestos Reserve (Parenthetical) (Details) - USD ($) $ in Millions | Dec. 31, 2018 | Sep. 30, 2018 | Dec. 31, 2017 | Sep. 30, 2017 | Sep. 30, 2016 | Sep. 30, 2015
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Ashland [Member] |  |  |  |  |  |  |  |  |  |  |
Asbestos claims [Roll Forward] |  |  |  |  |  |  |  |  |  |  |
Asbestos reserve | $ 369 | [1] | $ 380 | [1] | $ 409 | [1] | $ 419 | [1] | $ 415 | [1] | $ 409
Ashland [Member] | Other Current Liabilities [Member] |  |  |  |  |  |  |  |  |  |  |
Asbestos claims [Roll Forward] |  |  |  |  |  |  |  |  |  |  |
Asbestos reserve | 31 |  | 30 |  |  |  |  |  |  |  |
Hercules [Member] |  |  |  |  |  |  |  |  |  |  |
Asbestos claims [Roll Forward] |  |  |  |  |  |  |  |  |  |  |
Asbestos reserve | 276 | [2] | 282 | [2] | $ 315 | [2] | $ 323 | [2] | $ 321 | [2] | $ 311
Hercules [Member] | Other Current Liabilities [Member] |  |  |  |  |  |  |  |  |  |  |
Asbestos claims [Roll Forward] |  |  |  |  |  |  |  |  |  |  |
Asbestos reserve | $ 20 |  | $ 20 |  |  |  |  |  |  |  |
[1] | Included $31 million and $30 million classified in accrued expenses and other liabilities on the Condensed Consolidated Balance Sheets as of December 31, 2018 and September 30, 2018, respectively.
[2] | Included $20 million classified in accrued expenses and other liabilities on the Condensed Consolidated Balance Sheets as of both December 31, 2018 and September 30, 2018.

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- Definition Amount of valuation and qualifying accounts and reserves. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 4 -Subparagraph (SX 210.12-09) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e24092-122690 + Details
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