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Litigation, Claims and Contingencies - Schedule of Progression of Activity in the Asbestos Reserve (Details) - USD ($) $ in Millions | 12 Months Ended
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Sep. 30, 2019 | Sep. 30, 2018 | Sep. 30, 2017
Ashland [Member] |  |  |  |  |  |
Asbestos reserve [Roll Forward] |  |  |  |  |  |
Beginning balance |  | $ 380 | [1] | $ 419 | [1] | $ 415
Reserve adjustment |  | 1 |  | (8) |  | 36
Amounts paid |  | (29) |  | (31) |  | (32)
Ending balance | [1] | 352 |  | 380 |  | 419
Hercules [Member] |  |  |  |  |  |
Asbestos reserve [Roll Forward] |  |  |  |  |  |
Beginning balance |  | 282 | [2] | 323 | [2] | 321
Reserve adjustment |  | (10) |  | (19) |  | 16
Amounts paid |  | (20) |  | (22) |  | (14)
Ending balance | [2] | $ 252 |  | $ 282 |  | $ 323
[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 cash outflow to settle insured claims and pay costs incurred in the claims settlement process attributable to asbestos and environmental claims. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 40 -Section 50 -Paragraph 3 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=116884095&loc=d3e14764-158437 Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 17 -Subparagraph (f) -URI http://asc.fasb.org/extlink&oid=118932676&loc=d3e3367-108585 + Details
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- Definition Amount of increase (decrease) in valuation and qualifying accounts and reserves from adjustment. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -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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- 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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