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Litigation, Claims and Contingencies - Summary of Progression of Insurance Receivable (Parenthetical) (Details) - Ashland [Member] - USD ($) $ in Millions | Dec. 31, 2018 | Sep. 30, 2018 | Dec. 31, 2017 | [1] | Sep. 30, 2017 | [1] | Sep. 30, 2016 | [1] | Sep. 30, 2015
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Movement in Loss Contingency Receivable, Increase (Decrease) [Roll Forward] |  |  |  |  |  |  |  |
Insurance receivable | $ 139 | [1] | $ 140 | [1] | $ 151 | $ 155 | $ 151 | $ 150
Accounts Receivable [Member] |  |  |  |  |  |  |  |
Movement in Loss Contingency Receivable, Increase (Decrease) [Roll Forward] |  |  |  |  |  |  |  |
Insurance receivable | $ 15 |  | $ 15 |  |  |  |  |
[1] | Included $15 million classified in accounts receivable on the Condensed Consolidated Balance Sheets as of both December 31, 2018 and September 30, 2018

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- Definition Amount of receivable related to a loss contingency accrual. For example, an insurance recovery receivable. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 460 -SubTopic 10 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=115931803&loc=d3e12053-110248 + Details
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- Definition A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period. + References No definition available. + Details
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- Details
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- Details
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