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Litigation, Claims and Contingencies - Summary of Progression of Insurance Receivable (Details) - USD ($) $ in Millions	3 Months Ended			9 Months Ended			12 Months Ended
	Jun. 30, 2020		Jun. 30, 2019	Jun. 30, 2020		Jun. 30, 2019	Sep. 30, 2019		Sep. 30, 2018	Sep. 30, 2017
Movement in Loss Contingency Receivable, Increase (Decrease) [Roll Forward]
Insurance settlement	$ 1		$ 1	$ 4		$ 2
Ashland [Member]
Movement in Loss Contingency Receivable, Increase (Decrease) [Roll Forward]
Insurance receivable - beginning of year				123	[1]	140	$ 140		$ 155	$ 151
Receivable adjustment	1			1		(5)	(5)		(5)	15
Insurance settlement				(10)		0	0		0	(5)
Amounts collected				(7)		(5)	(12)		(10)	(6)
Insurance receivable - end of period	105	[1]	130	105	[1]	130	123	[1]	140	155
Hercules [Member]
Movement in Loss Contingency Receivable, Increase (Decrease) [Roll Forward]
Insurance receivable - beginning of year				49		54	54		68	63
Receivable adjustment	(2)			(2)		(5)	(5)		(14)	5
Insurance receivable - end of period	$ 47		$ 49	$ 47		$ 49	$ 49		$ 54	$ 68
[1] Included $14 million and $15 million classified in accounts receivable on the Condensed Consolidated Balance Sheets as of June 30, 2020 and September 30, 2019

X

- Definition

Loss contingency insurance receivable increase (decrease).

+ References

No definition available.

+ Details

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- Definition

The increase (decrease) during the reporting period in insurance settlements receivable, which are amounts due in settlement of a claim for reimbursement from an insurance company when the Company has suffered a loss covered under an insurance policy. The expectation is that such reimbursement will be received within one year of the balance sheet date.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 28
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=118932676&loc=d3e3602-108585

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Period Type:	duration

X

- Definition

Amount of receivable related to a loss contingency accrual. For example, an insurance recovery receivable.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 460
-SubTopic 10
-Section 50
-Paragraph 3
-URI http://asc.fasb.org/extlink&oid=118943654&loc=d3e12053-110248

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X

- Definition

Amount of cash inflow from the collection of receivables related to a loss contingency.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 460
-SubTopic 10
-Section 50
-Paragraph 3
-URI http://asc.fasb.org/extlink&oid=118943654&loc=d3e12053-110248

Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 17
-Subparagraph (f)
-URI http://asc.fasb.org/extlink&oid=118932676&loc=d3e3367-108585

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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.

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