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Litigation, Claims and Contingencies - Schedule of Progression of Activity in the Asbestos Reserve (Parenthetical) (Details) - USD ($) $ in Millions | Sep. 30, 2019 | Sep. 30, 2018 | Sep. 30, 2017 | Sep. 30, 2016
--- | --- | --- | --- | ---
Ashland [Member] |  |  |  |  |  |  |
Asbestos claims [Roll Forward] |  |  |  |  |  |  |
Asbestos reserve | $ 352 | [1] | $ 380 | [1] | $ 419 | [1] | $ 415
Ashland [Member] | Other Current Liabilities [Member] |  |  |  |  |  |  |
Asbestos claims [Roll Forward] |  |  |  |  |  |  |
Asbestos reserve | 28 |  | 30 |  |  |  |
Hercules [Member] |  |  |  |  |  |  |
Asbestos claims [Roll Forward] |  |  |  |  |  |  |
Asbestos reserve | 252 | [2] | 282 | [2] | $ 323 | [2] | $ 321
Hercules [Member] | Other Current Liabilities [Member] |  |  |  |  |  |  |
Asbestos claims [Roll Forward] |  |  |  |  |  |  |
Asbestos reserve | $ 21 |  | $ 20 |  |  |  |
[1] | Included $28 million and $30 million classified in accrued expenses and other liabilities on the Consolidated Balance Sheets as of September 30, 2019 and 2018, respectively.
[2] | Included $21 million and $20 million classified in accrued expenses and other liabilities on the Consolidated Balance Sheets as of September 30, 2019 and 2018, respectively.

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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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