| Cover Document | Aug. 01, 2019 | Jun. 30, 2019 |
| Cover page. | ||
| Entity Central Index Key | 0001707092 | |
| Title of 12(b) Security | Ordinary Shares. $0.01 par value per share | |
| Trading Symbol | DLPH | |
| Entity Incorporation, State or Country Code | Y9 | |
| Document Type | 8-K | |
| Document Period End Date | Aug. 1, 2019 | |
| Entity Registrant Name | DELPHI TECHNOLOGIES PLC | |
| Entity File Number | 001-38110 | |
| Entity Tax Identification Number | 98-1367514 | |
| Entity Address, Address Line One | One Angel Court | |
| Entity Address, Address Line Two | 10th Floor | |
| Entity Address, City or Town | London | |
| Entity Address, Postal Zip Code | EC2R 7HJ | |
| Entity Address, Country | GB | |
| City Area Code | 011 | |
| Country Region | 44 | |
| Local Phone Number | 020-305-74300 | |
| 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 | |
| Amendment Flag | false |
