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Divestitures - Summary of Assets and Liabilities Held for Sale (Parenthetical) (Details) - USD ($) $ in Millions	Dec. 31, 2018	Sep. 30, 2018
Divestitures [Abstract]
Allowance for doubtful accounts	$ 3	$ 3

X

- Definition

Disposal group including discontinued operation allowance for doubtful accounts receivable current.

+ References

No definition available.

+ Details

Name:	ash_DisposalGroupIncludingDiscontinuedOperationAllowanceForDoubtfulAccountsReceivableCurrent
Namespace Prefix:	ash_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- Definition

Divestitures.

+ References

No definition available.

+ Details

Name:	ash_DivestituresAbstract
Namespace Prefix:	ash_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration