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

X

- Definition

Loss contingency insurance receivable increase (decrease).

+ References

No definition available.

+ Details

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Balance Type:	na
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X

- 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

+ Details

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Namespace Prefix:	us-gaap_
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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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Namespace Prefix:	us-gaap_
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Period Type:	instant

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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X

- 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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