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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, 2019	Jun. 30, 2018	Jun. 30, 2019		Jun. 30, 2018		Sep. 30, 2018		Sep. 30, 2017		Sep. 30, 2016
Movement in Loss Contingency Receivable, Increase (Decrease) [Roll Forward]
Insurance settlement		$ 1	$ 1	$ 2		$ 2
Ashland [Member]
Movement in Loss Contingency Receivable, Increase (Decrease) [Roll Forward]
Insurance receivable - beginning of year				140	[1]	155	[1]	$ 155	[1]	$ 151	[1]	$ 150
Receivable adjustment		(5)		(5)		(5)		(5)		15		16
Insurance settlement				0		0		0		(5)		(4)
Amounts collected				(5)		(8)		(10)		(6)		(11)
Insurance receivable - end of period	[1]	130	142	130		142		140		155		151
Hercules [Member]
Movement in Loss Contingency Receivable, Increase (Decrease) [Roll Forward]
Insurance receivable - beginning of year				54		68		68		63		56
Receivable adjustment		(5)		(5)		(14)		(14)		5		7
Insurance receivable - end of period		$ 49	$ 54	$ 49		$ 54		$ 54		$ 68		$ 63
[1] Includes $18 million and $15 million classified in accounts receivable on the Condensed Consolidated Balance Sheets as of June 30, 2019 and September 30, 2018

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=109223946&loc=d3e3602-108585

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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=115931803&loc=d3e12053-110248

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Data Type:	xbrli:monetaryItemType
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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=115931803&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=109223946&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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