v3.19.3
Document And Entity Information - USD ($)
 12 Months Ended
Sep. 30, 2019
Oct. 31, 2019
Mar. 31, 2019
Cover [Abstract]      
Entity Registrant Name ASHLAND GLOBAL HOLDINGS INC.    
Entity Central Index Key 0001674862    
Current Fiscal Year End Date --09-30    
Entity Well-known Seasoned Issuer Yes    
Entity Voluntary Filers No    
Entity Current Reporting Status Yes    
Entity Interactive Data Current Yes    
Entity Filer Category Large Accelerated Filer    
Entity Small Business false    
Entity Emerging Growth Company false    
Entity Shell Company false    
Entity Public Float     $ 4,880,568,000
Entity Common Stock, Shares Outstanding   60,183,754  
Document Fiscal Year Focus 2019    
Document Fiscal Period Focus FY    
Trading Symbol ASH    
Document Type 10-K    
Amendment Flag false    
Document Period End Date Sep. 30, 2019    
Title of 12(b) Security Common Stock, par value $.01 per share    
Security Exchange Name NYSE    
Entity File Number 333-211719    
Entity Incorporation, State or Country Code DE    
Entity Tax Identification Number 81-2587835    
Entity Address, Address Line One 50 E. RiverCenter Boulevard    
Entity Address, City or Town Covington    
Entity Address, State or Province KY    
Entity Address, Postal Zip Code 41011    
City Area Code 859    
Local Phone Number 815-3333    
Document Annual Report true    
Document Transition Report false    
Documents Incorporated by Reference Portions of Registrant’s Proxy Statement (Proxy Statement) for its Annual Meeting of Stockholders are incorporated by reference into Part III of this annual report on Form 10-K to the extent described herein.