| Document and Entity Information | Sep. 10, 2024 |
| Cover [Abstract] | |
| Document Type | 8-K |
| Amendment Flag | false |
| Document Period End Date | Sep. 10, 2024 |
| Entity File Number | 001-41708 |
| Entity Registrant Name | PHINIA INC. |
| Entity Central Index Key | 0001968915 |
| Entity Incorporation, State or Country Code | DE |
| Entity Tax Identification Number | 92-2483604 |
| Entity Address, Address Line One | 3000 University Drive |
| Entity Address, City or Town | Auburn Hills |
| Entity Address, State or Province | MI |
| Entity Address, Postal Zip Code | 48326 |
| City Area Code | 248 |
| Local Phone Number | 732-1900 |
| Title of 12(b) Security | Common Stock, par value $0.01 per share |
| Trading Symbol | PHIN |
| Security Exchange Name | NYSE |
| Entity Emerging Growth Company | false |
| Written Communications | false |
| Soliciting Material | false |
| Pre-commencement Tender Offer | false |
| Pre-commencement Issuer Tender Offer | false |
