XML 65 R43.htm IDEA: XBRL DOCUMENT
v3.19.2

Divestitures - Summary of Assets and Liabilities Held for Sale (Parenthetical) (Details) - USD ($) $ in Millions | Jun. 30, 2019 | 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