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Litigation, Claims and Contingencies - Schedule of Progression of Activity in the Asbestos Reserve (Details) - USD ($) $ in Millions | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2018 | Jun. 30, 2018 | Dec. 31, 2017 | Sep. 30, 2018 | Sep. 30, 2017 | Sep. 30, 2016
Ashland [Member] |  |  |  |  |  |  |  |  |  |  |
Asbestos reserve [Roll Forward] |  |  |  |  |  |  |  |  |  |  |
Asbestos reserve - beginning of year |  | $ 380 | [1] |  | $ 419 | [1] | $ 419 | [1] | $ 415 | [1] | $ 409
Reserve adjustment |  | 0 |  | $ (8) | 0 |  | (8) |  | 36 |  | 37
Amounts paid |  | (11) |  |  | (10) |  | (31) |  | (32) |  | (31)
Asbestos reserve - end of period | [1] | 369 |  |  | 409 |  | 380 |  | 419 |  | 415
Hercules [Member] |  |  |  |  |  |  |  |  |  |  |
Asbestos reserve [Roll Forward] |  |  |  |  |  |  |  |  |  |  |
Asbestos reserve - beginning of year |  | 282 | [2] |  | 323 | [2] | 323 | [2] | 321 | [2] | 311
Reserve adjustment |  | 0 |  | $ (19) | 0 |  | (19) |  | 16 |  | 25
Amounts paid |  | (6) |  |  | (8) |  | (22) |  | (14) |  | (15)
Asbestos reserve - end of period | [2] | $ 276 |  |  | $ 315 |  | $ 282 |  | $ 323 |  | $ 321
[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 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=99382578&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=109223946&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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