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Goodwill and Other Intangibles - Summary of Goodwill by Reportable Segment (Details) $ in Millions	3 Months Ended
	Dec. 31, 2019 USD ($)
Goodwill [Roll Forward]
Balance at beginning of period	$ 2,253
Currency translation	21
Balance at end of period	2,274
Specialty Ingredients [Member]
Goodwill [Roll Forward]
Balance at beginning of period	2,253
Currency translation	21
Balance at end of period	2,274
Intermediates and Solvents [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 December 31, 2019 and September 30, 2019, there was accumulated impairment of $90 million related to the Intermediates and Solvents reportable segment.

X

- 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

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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

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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

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