| Document and Entity Information | Dec. 18, 2019 |
| Cover [Abstract] | |
| Document Type | 8-K |
| Amendment Flag | false |
| Document Period End Date | Dec. 18, 2019 |
| Entity Registrant Name | ASHLAND GLOBAL HOLDINGS INC. |
| Entity Central Index Key | 0001674862 |
| Entity Emerging Growth Company | false |
| 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 |
| Written Communications | false |
| Soliciting Material | false |
| Pre-commencement Tender Offer | false |
| Pre-commencement Issuer Tender Offer | false |
| Title of each class | Common Stock (par value $.01) |
| Trading Symbol | ASH |
| Name of each exchange on which registered | NYSE |
