| Document and Entity Information | Sep. 30, 2021 |
| Cover [Abstract] | |
| Amendment Flag | false |
| Entity Central Index Key | 0001670541 |
| Document Type | 8-K |
| Document Period End Date | Sep. 30, 2021 |
| Entity Registrant Name | ADIENT PLC |
| Entity Incorporation State Country Code | L2 |
| Entity File Number | 001-37757 |
| Entity Tax Identification Number | 98-1328821 |
| Entity Address, Address Line One | 25-28 North Wall Quay |
| Entity Address, Address Line Two | IFSC |
| Entity Address, City or Town | Dublin 1 |
| Entity Address, Country | IE |
| Entity Address, Postal Zip Code | D01 H104 |
| City Area Code | 734 |
| Local Phone Number | 254-5000 |
| Security 12b Title | Ordinary Shares, par value $0.001 |
| Trading Symbol | ADNT |
| Security Exchange Name | NYSE |
| Written Communications | false |
| Soliciting Material | false |
| Pre Commencement Tender Offer | false |
| Pre Commencement Issuer Tender Offer | false |
| Entity Emerging Growth Company | false |
