Earnings Per Share (Tables)

12 Months Ended

Dec. 31, 2020

Earnings Per Share [Abstract]

Schedule of earnings per share reconciliation

The following table reconciles the numerators and denominators used to calculate basic and diluted earnings per share of common stock:

	Year Ended December 31,
(in millions except share and per share amounts)	2020		2019		2018
Basic earnings per share:
Net earnings attributable to BorgWarner Inc.	$	500	$	746	$	931
Weighted average shares of common stock outstanding	213.0		205.7		208.2
Basic earnings per share of common stock	$	2.35	$	3.63	$	4.47
Diluted earnings per share:
Net earnings attributable to BorgWarner Inc.	$	500	$	746	$	931
Weighted average shares of common stock outstanding	213.0		205.7		208.2
Effect of stock-based compensation	1.0		1.1		1.3
Weighted average shares of common stock outstanding including dilutive shares	214.0		206.8		209.5
Diluted earnings per share of common stock	$	2.34	$	3.61	$	4.44
Antidilutive stock-based awards excluded from the calculation of diluted earnings per share	—		0.1		0.1