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Goodwill and Other Intangibles - Summary of Goodwill by Reportable Segment (Details) - USD ($) $ in Millions | 12 Months Ended
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Sep. 30, 2019 | Sep. 30, 2018
Goodwill [Roll Forward] |  |  |
Balance at beginning of period |  | $ 2,304 | $ 2,315
Acquisition | [1] |  | 5
Currency translation |  | (51) | (16)
Balance at end of period |  | 2,253 | 2,304
Specialty Ingredients [Member] |  |  |
Goodwill [Roll Forward] |  |  |
Balance at beginning of period |  | 2,304 | 2,315
Acquisition | [1] |  | 5
Currency translation |  | (51) | (16)
Balance at end of period |  | 2,253 | 2,304
Intermediates and Solvents [Member] |  |  |
Goodwill [Roll Forward] |  |  |
Balance at beginning of period | [2] | 0 | 0
Acquisition | [1],[2] |  | 0
Currency translation | [2] | 0 | 0
Balance at end of period | [2] | $ 0 | $ 0
[1] | Relates to the acquisition of Pharmachem during 2017 and Vornia Limited during 2018. See Note C for more information.
[2] | As of September 30, 2019 and 2018, there was accumulated impairment of $90 million related to the Intermediates and Solvents reportable segment.

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- Definition Amount after accumulated impairment loss of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 45 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=77989000&loc=SL49117168-202975 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=99380562&loc=d3e13770-109266 + Details
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- Definition Amount of increase in asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized resulting from a business combination. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=108376223&loc=d3e13816-109267 + Details
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- Definition Amount of foreign currency translation gain (loss) which increases (decreases) an asset representing future economic benefits from other assets acquired in a business combination that are not individually identified and separately recognized. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (f) -URI http://asc.fasb.org/extlink&oid=108376223&loc=d3e13816-109267 + Details
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