XML 100 R78.htm IDEA: XBRL DOCUMENT v3.19.2

Litigation, Claims and Contingencies - Summary of Components of Environmental Remediation Expense Included within Selling, General and Administrative Expense (Parenthetical) (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Environmental Expense And Liabilities [Abstract]
Net expense relates to divested businesses	$ 5	$ 3	$ 7	$ 4

X

- Definition

Net expense related to divested businesses.

+ References

No definition available.

+ Details

Name:	ash_NetExpenseRelatedToDivestedBusinesses
Namespace Prefix:	ash_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

X

- References

No definition available.

+ Details

Name:	us-gaap_EnvironmentalExpenseAndLiabilitiesAbstract
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration