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Goodwill and Other Intangibles - Summary of Goodwill by Reportable Segment (Details) - USD ($) | 3 Months Ended | 9 Months Ended
--- | --- | ---
Jun. 30, 2020 | Jun. 30, 2019 | Jun. 30, 2020 | Jun. 30, 2019
Goodwill [Roll Forward] |  |  |  |  |
Balance at beginning of period |  |  |  | $ 2,253,000,000 |
Impairment |  | $ 0 | $ 0 | (530,000,000) | $ 0
Currency translation |  |  |  | 11,000,000 |
Balance at end of period |  | 1,734,000,000 |  | 1,734,000,000 |
Life Sciences [Member] |  |  |  |  |
Goodwill [Roll Forward] |  |  |  |  |
Balance at beginning of period |  |  |  | 836,000,000 |
Impairment |  |  |  | 0 |
Currency translation |  |  |  | 6,000,000 |
Balance at end of period |  | 842,000,000 |  | 842,000,000 |
Personal Care & Household [Member] |  |  |  |  |
Goodwill [Roll Forward] |  |  |  |  |
Balance at beginning of period |  |  |  | 355,000,000 |
Impairment |  | 0 |  | (356,000,000) |
Currency translation |  |  |  | 1,000,000 |
Balance at end of period |  | 0 |  | 0 |
Specialty Additives [Member] |  |  |  |  |
Goodwill [Roll Forward] |  |  |  |  |
Balance at beginning of period |  |  |  | 609,000,000 |
Impairment |  |  |  | (174,000,000) |
Currency translation |  |  |  | 4,000,000 |
Balance at end of period |  | 439,000,000 |  | 439,000,000 |
Performance Adhesives [Member] |  |  |  |  |
Goodwill [Roll Forward] |  |  |  |  |
Balance at beginning of period |  |  |  | 453,000,000 |
Impairment |  |  |  | 0 |
Currency translation |  |  |  | 0 |
Balance at end of period |  | 453,000,000 |  | 453,000,000 |
Intermediates and Solvents [Member] |  |  |  |  |
Goodwill [Roll Forward] |  |  |  |  |
Balance at beginning of period | [1] |  |  | 0 |
Impairment | [1] |  |  | 0 |
Currency translation | [1] |  |  | 0 |
Balance at end of period | [1] | $ 0 |  | $ 0 |
[1] | As of June 30, 2020 and September 30, 2019, 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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