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Goodwill and Other Intangibles - Summary of Goodwill by Reportable Segment (Details) $ in Millions | 6 Months Ended
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Mar. 31, 2022 USD ($)
Goodwill [Roll Forward] |  |
Balance at beginning of period | $ 1,430 |
Currency translation | (26) |
Balance at end of period | 1,404 |
Life Sciences [Member] |  |
Goodwill [Roll Forward] |  |
Balance at beginning of period | 856 |
Currency translation | (16) |
Balance at end of period | 840 |
Personal Care [Member] |  |
Goodwill [Roll Forward] |  |
Balance at beginning of period | 129 | [1]
Currency translation | (3) | [1]
Balance at end of period | 126 | [1]
Specialty Additives [Member] |  |
Goodwill [Roll Forward] |  |
Balance at beginning of period | 445 | [1]
Currency translation | (7) | [1]
Balance at end of period | 438 | [1]
Intermediates [Member] |  |
Goodwill [Roll Forward] |  |
Balance at beginning of period | 0 | [1]
Currency translation | 0 | [1]
Balance at end of period | $ 0 | [1]
[1] | As of March 31, 2022 and September 30, 2021, there were accumulated impairments of $356 million, $174 million and $90 million related to the Personal Care, Specialty Additives and Intermediates reportable segments, respectively.

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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://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03(10)(1)) -URI http://asc.fasb.org/extlink&oid=120398452&loc=d3e534808-122878 Reference 2: 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=120320667&loc=SL49117168-202975 Reference 3: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 852 -SubTopic 10 -Section 55 -Paragraph 10 -URI http://asc.fasb.org/extlink&oid=84165509&loc=d3e56426-112766 Reference 4: 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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Period Type: | instant

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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=121556970&loc=d3e13816-109267 + 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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Namespace Prefix: |
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Balance Type: |
Period Type: |

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- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
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Balance Type: |
Period Type: |