ACQUISITIONS - Summary of Purchase Price Consideration (Details) - USD ($) $ / shares in Units, $ in Millions		12 Months Ended
	Oct. 01, 2020	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Business Acquisition [Line Items]
Issued acquisition (in shares)	37,000,000
Stock compensation consideration	$ 7
Cash consideration		$ 449	$ 10	$ 0
Delphi Technologies PLC
Business Acquisition [Line Items]
Issued acquisition (in shares)	37,188,819
BorgWarner share price at October 1, 2020	$ 39.54
Fair value of stock consideration	$ 1,470
Stock compensation consideration	7
Total stock consideration	1,477
Cash consideration	18
Repayment of Delphi Technologies’ debt	896
Total consideration	$ 2,391