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Revenue - Additional Information (Details) - USD ($) $ in Millions	3 Months Ended
	Dec. 31, 2018	Sep. 30, 2018
Revenue From Contracts With Customers [Line Items]
Maximum cash collection period from customer	60 days
Trade Receivable [Member]
Revenue From Contracts With Customers [Line Items]
Trade receivables	$ 415	$ 482
Maximum [Member]
Revenue From Contracts With Customers [Line Items]
Cost incurred to obtain contract With customer amortization period of revenue recognition	1 year
Cost incurred to obtain contract with customer amortization period of practical expedients	1 year

X

- Definition

Cost incurred to obtain contract with customer amortization period of practical expedients.

+ References

No definition available.

+ Details

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X

- Definition

Cost incurred to obtain contract With customer amortization period of revenue recognition.

+ References

No definition available.

+ Details

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X

- Definition

Maximum cash collection period from customer.

+ References

No definition available.

+ Details

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Namespace Prefix:	ash_
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Period Type:	duration

X

- Definition

Revenue from contracts with customers line items.

+ References

No definition available.

+ Details

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Namespace Prefix:	ash_
Data Type:	xbrli:stringItemType
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X

- Definition

Amount, after allowance for credit loss, of right to consideration in exchange for good or service transferred to customer when right is conditioned on something other than passage of time, classified as current.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
-SubTopic 10
-Section 45
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=82913815&loc=SL49130531-203044

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
-SubTopic 10
-Section 45
-Paragraph 3
-URI http://asc.fasb.org/extlink&oid=82913815&loc=SL49130533-203044

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

X

- Details

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