| Cover | Feb. 15, 2021 |
| Schedule of Capitalization, Equity [Line Items] | |
| Document Type | 8-K/A |
| Amendment Flag | true |
| Amendment Description | This Amendment No. 1 to Current Report on Form 8-K/A is being filed by the Company to amend Item 9.01 of the Form 8-K to file the following as exhibits to the Form 8-K: (i) the BCA, which is filed as Exhibit 10.1 hereto and is incorporated herein by reference; (ii) the Irrevocable by and among Sven Schulz, Sven Schulz Group GmbH, the Company and BidCo, which is filed as Exhibit 10.2 hereto and is incorporated herein by reference; (iii) the Irrevocable by and among Stephen Raiser, the Company and BidCo, which is filed as Exhibit 10.3 hereto and is incorporated herein by reference; (iv) the Irrevocable by and among Felix von Borck, the Company and BidCo, which is filed as Exhibit 10.4 hereto and is incorporated herein by reference; and (v) the Irrevocable by and among Dr. Björn Eberleh, the Company and BidCo, which is filed as Exhibit 10.5 hereto and is incorporated herein by reference. |
| Document Period End Date | Feb. 15, 2021 |
| Entity File Number | 1-12162 |
| Entity Registrant Name | BorgWarner Inc. |
| Entity Central Index Key | 0000908255 |
| Entity Tax Identification Number | 13-3404508 |
| Entity Incorporation, State or Country Code | DE |
| Entity Address, Address Line One | 3850 Hamlin Road |
| 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 | 754-9200 |
| Written Communications | false |
| Soliciting Material | false |
| Pre-commencement Tender Offer | false |
| Pre-commencement Issuer Tender Offer | false |
| Entity Emerging Growth Company | false |
| Common Stock [Member] | |
| Schedule of Capitalization, Equity [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 November 2022 [Member] | Senior Notes [Member] | |
| Schedule of Capitalization, Equity [Line Items] | |
| Title of 12(b) Security | 1.80% Senior Notes due 2022 |
| Trading Symbol | BWA22 |
| Security Exchange Name | NYSE |
