Document And Entity Information	9 Months Ended
	Jun. 30, 2021 shares
Cover [Abstract]
Entity Registrant Name	ASHLAND GLOBAL HOLDINGS INC.
Entity Central Index Key	0001674862
Current Fiscal Year End Date	--09-30
Entity Current Reporting Status	Yes
Entity Filer Category	Large Accelerated Filer
Entity Small Business	false
Entity Emerging Growth Company	false
Entity File Number	333-211719
Entity Tax Identification Number	81-2587835
Entity Address, Address Line One	8145 Blazer Drive
Entity Address, City or Town	Wilmington
Entity Address, State or Province	DE
Entity Address, Postal Zip Code	19808
Entity Shell Company	false
Entity Interactive Data Current	Yes
Document Quarterly Report	true
Document Transition Report	false
City Area Code	302
Local Phone Number	995-3000
Entity Common Stock, Shares Outstanding	60,733,352
Document Fiscal Year Focus	2021
Document Fiscal Period Focus	Q3
Trading Symbol	ASH
Title of 12(b) Security	Common Stock, par value $.01 per share
Security Exchange Name	NYSE
Document Type	10-Q
Amendment Flag	false
Document Period End Date	Jun. 30, 2021
Entity Incorporation, State or Country Code	DE