Document and Entity Information Document - shares	9 Months Ended
	Sep. 30, 2019	Oct. 25, 2019
Entity Information [Line Items]
Document Type	10-Q
Document Quarterly Report	true
Document Period End Date	Sep. 30, 2019
Document Transition Report	false
Entity File Number	1-12162
Entity Registrant Name	BORGWARNER INC.
Entity Incorporation, State or Country Code	DE
Entity Tax Identification Number	13-3404508
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
Entity Current Reporting Status	Yes
Entity Interactive Data Current	Yes
Entity Filer Category	Large Accelerated Filer
Entity Small Business	false
Entity Emerging Growth Company	false
Entity Shell Company	false
Entity Common Stock, Shares Outstanding		206,493,057
Entity Central Index Key	0000908255
Amendment Flag	false
Document Fiscal Year Focus	2019
Document Fiscal Period Focus	Q3
Current Fiscal Year End Date	--12-31
Common Stock, par value $0.01 per share [Member]
Entity Information [Line Items]
Title of each class	Common Stock, par value $0.01 per share
Trading Symbol	BWA
Security Exchange Name	NYSE
1.80% Senior Notes due 2022 [Member]
Entity Information [Line Items]
Title of each class	1.80% Senior Notes due 2022
Trading Symbol	BWA22
Security Exchange Name	NYSE