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Litigation, Claims and Contingencies - Summary of Progression of Insurance Receivable (Details) - USD ($) $ in Millions | 3 Months Ended | 12 Months Ended
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Dec. 31, 2018 | Jun. 30, 2018 | Dec. 31, 2017 | Sep. 30, 2018 | Sep. 30, 2017 | Sep. 30, 2016
Movement in Loss Contingency Receivable, Increase (Decrease) [Roll Forward] |  |  |  |  |  |  |  |  |  |  |
Insurance settlement | [1] | $ 1 |  |  | $ 0 |  |  |  |  |  |
Ashland [Member] |  |  |  |  |  |  |  |  |  |  |
Movement in Loss Contingency Receivable, Increase (Decrease) [Roll Forward] |  |  |  |  |  |  |  |  |  |  |
Insurance receivable - beginning of year |  | 140 | [2] |  | 155 | [2] | $ 155 | [2] | $ 151 | [2] | $ 150
Receivable adjustment |  | 0 |  | $ (5) | 0 |  | (5) |  | 15 |  | 16
Insurance settlement |  | 0 |  |  | 0 |  | 0 |  | (5) |  | (4)
Amounts collected |  | (1) |  |  | (4) |  | (10) |  | (6) |  | (11)
Insurance receivable - end of period | [2] | 139 |  |  | 151 |  | 140 |  | 155 |  | 151
Hercules [Member] |  |  |  |  |  |  |  |  |  |  |
Movement in Loss Contingency Receivable, Increase (Decrease) [Roll Forward] |  |  |  |  |  |  |  |  |  |  |
Insurance receivable - beginning of year |  | 54 |  |  | 68 |  | 68 |  | 63 |  | 56
Receivable adjustment |  | 0 |  | $ (14) | 0 |  | (14) |  | 5 |  | 7
Insurance receivable - end of period |  | $ 54 |  |  | $ 68 |  | $ 54 |  | $ 68 |  | $ 63
[1] | Activity of $0 denotes value less than $1 million.
[2] | 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 Loss contingency insurance receivable increase (decrease). + References No definition available. + Details
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- Definition The increase (decrease) during the reporting period in insurance settlements receivable, which are amounts due in settlement of a claim for reimbursement from an insurance company when the Company has suffered a loss covered under an insurance policy. The expectation is that such reimbursement will be received within one year of the balance sheet date. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=109223946&loc=d3e3602-108585 + Details
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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 Amount of cash inflow from the collection of receivables related to a loss contingency. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -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 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 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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