Earnings Per Share (Details) - USD ($) $ / shares in Units, $ in Millions	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
Earnings Per Share, Diluted, by Common Class, Including Two Class Method [Line Items]
Performance shares excluded from diluted earnings per share	114,720
Antidilutive securities excluded from computation of earnings per share amount	0	500,000
Basic earnings per share:
Net earnings attributable to BorgWarner Inc.	$ 129	$ 160
Weighted average shares of common stock outstanding	205,700,000	206,500,000
Basic earnings per share of common stock	$ 0.63	$ 0.77
Diluted earnings per share:
Net earnings attributable to BorgWarner Inc.	$ 129	$ 160
Weighted average shares of common stock outstanding	205,700,000	206,500,000
Effect of stock-based compensation	500,000	600,000
Weighted average shares of common stock outstanding including dilutive shares	206,200,000	207,100,000
Diluted earnings per share of common stock	$ 0.63	$ 0.77