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Debt - Summary of Current and Long-term Debt (Parenthetical) (Details) - USD ($) $ in Millions	12 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2017
Debt Instrument [Line Items]
Unamortized debt issuance expense, long-term debt	$ 12	$ 21
Short-term debt outstanding balances	$ 166	254
Junior Subordinated Debt [Member]
Debt Instrument [Line Items]
Debt instrument, interest rate, stated percentage	6.50%
Debt instrument, maturity year	2029
Medium-term Notes [Member]
Debt Instrument [Line Items]
Debt instrument, interest rate, stated percentage	9.35%
Debt instrument, maturity year	2019
Notes due 2022 [Member]
Debt Instrument [Line Items]
Debt instrument, interest rate, stated percentage	4.75%		4.75%
Debt instrument, maturity year	2022
Term Loan B due 2024 [Member]
Debt Instrument [Line Items]
Debt instrument, maturity year	2024
Notes due 2043 [Member]
Debt Instrument [Line Items]
Debt instrument, interest rate, stated percentage	6.875%
Debt instrument, maturity year	2043
Term Loan A due 2022 [Member]
Debt Instrument [Line Items]
Debt instrument, maturity year	2022
European Facility [Member]
Debt Instrument [Line Items]
Short-term debt outstanding balances	$ 22	$ 23

X

- Definition

Debt instrument maturity year.

+ References

No definition available.

+ Details

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Balance Type:	na
Period Type:	duration

X

- Definition

The remaining balance of debt issuance expenses that were capitalized and are being amortized against income over the lives of the respective long-term debt and presented as a direct reduction to long-term debt.

+ References

No definition available.

+ Details

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Namespace Prefix:	ash_
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Balance Type:	credit
Period Type:	instant

X

- Definition

Contractual interest rate for funds borrowed, under the debt agreement.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.22(a)(1))
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

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X

- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

+ Details

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Data Type:	xbrli:stringItemType
Balance Type:	na
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X

- Definition

Reflects the total carrying amount as of the balance sheet date of debt having initial terms less than one year or the normal operating cycle, if longer.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02(19)(a))
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 944
-SubTopic 210
-Section S99
-Paragraph 1
-Subparagraph (SX 210.7-03(a)(16)(a)(1))
-URI http://asc.fasb.org/extlink&oid=119400593&loc=d3e572229-122910

Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 210
-Section S99
-Paragraph 1
-Subparagraph (SX 210.9-03(13))
-URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878

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- Details

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- Details

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- Details

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- Details

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- Details

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