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Fair Value Measurements - Additional Information (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Sep. 30, 2019 | Sep. 30, 2018 | Sep. 30, 2017
Fair Value Disclosures [Abstract] |  |  |  |
Restricted Investments, Current |  | $ 24 | $ 30 |
Purchases of investment securities |  | 348 | 26 | $ 19
Sales of investment securities |  | 348 | 26 | 19
Restricted Investment [Abstract] |  |  |  |
Unrealized gains on equity securities | [1] | 7 | 18 | 25
Deferred income taxes |  | 20 | (100) | $ (26)
Other financial instruments [Abstract] |  |  |  |
Long-term Debt, Carrying Value |  | 1,513 | 2,307 |
Long-term Debt, Fair Value |  | $ 1,680 | 2,372 |
Accounting Standards Update 2016-01 | Reclassified from AOCI to Retained Earnings [Member] |  |  |  |
Restricted Investment [Abstract] |  |  |  |
Unrealized gains on equity securities |  |  | 54 |
Deferred income taxes |  |  | $ 20 |
[1] | Ashland determined that all unrealized gains and losses were related to equity securities with readily determinable fair values. Due to the new accounting guidance adopted in the first quarter of fiscal year 2019, the net unrealized losses during the year ended September 30, 2019 were recorded within the net interest and other expense (income) caption in the Statements of Consolidated Income (Loss). In 2018 and 2017 these net unrealized gains (losses) were in AOCI.

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- Definition Amount, before unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but is not limited to, notes payable, bonds payable, commercial loans, mortgage loans, convertible debt, subordinated debt and other types of debt. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 20 -Section 50 -Paragraph 4 -Subparagraph (b)(1) -URI http://asc.fasb.org/extlink&oid=109500613&loc=SL6031897-161870 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03(16)) -URI http://asc.fasb.org/extlink&oid=119400593&loc=d3e572229-122910 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(22)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03(16)) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 + Details
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- Definition The fair value amount of long-term debt whether such amount is presented as a separate caption or as a parenthetical disclosure. Additionally, this element may be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements. The element may be used in both the balance sheet and disclosure in the same submission. + References No definition available. + Details
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