| Cover | Nov. 03, 2021 | Aug. 04, 2021 |
| Cover [Abstract] | ||
| Document Period End Date | Nov. 3, 2021 | |
| Document Type | 8-K | |
| Entity File Number | 1-12162 | |
| Entity Information [Line Items] | ||
| Entity Registrant Name | BORGWARNER INC. | |
| Entity Address, Postal Zip Code | 48326 | |
| Entity Address, Address Line One | 3850 Hamlin Road, | |
| Entity Address, City or Town | Auburn Hills, | |
| Entity Address, State or Province | MI | |
| City Area Code | 248 | |
| Local Phone Number | 754-9200 | |
| Entity Emerging Growth Company | false | |
| Written Communications | false | |
| Soliciting Material | false | |
| Pre-commencement Tender Offer | false | |
| Pre-commencement Issuer Tender Offer | false | |
| Entity Central Index Key | 0000908255 | |
| Amendment Flag | false | |
| Entity Incorporation, State or Country Code | DE | |
| Entity Tax Identification Number | 13-3404508 | |
| Common Stock | ||
| Entity Information [Line Items] | ||
| Title of 12(b) Security | Common Stock, par value $0.01 per share | |
| Trading Symbol | BWA | |
| Security Exchange Name | NYSE | |
| Senior Notes Due May 2031 | Senior Notes | ||
| Entity Information [Line Items] | ||
| Title of 12(b) Security | 1.00% Senior Notes due 2031 | |
| Trading Symbol | BWA31 | |
| Security Exchange Name | NYSE |
