Earnings Per Share (Tables)

6 Months Ended

Jun. 30, 2019

Earnings Per Share [Abstract]

Schedule of Earnings Per Share Reconciliation

	Three Months Ended June 30,				Six Months Ended June 30,
(in millions, except per share amounts)	2019		2018		2019		2018
Basic earnings per share:
Net earnings attributable to BorgWarner Inc.	$	172	$	272	$	332	$	497
Weighted average shares of common stock outstanding	205.7		208.6		206.1		209.0
Basic earnings per share of common stock	$	0.84	$	1.30	$	1.61	$	2.38
Diluted earnings per share:
Net earnings attributable to BorgWarner Inc.	$	172	$	272	$	332	$	497
Weighted average shares of common stock outstanding	205.7		208.6		206.1		209.0
Effect of stock-based compensation	1.1		1.3		0.9		1.3
Weighted average shares of common stock outstanding including dilutive shares	206.8		209.9		207.0		210.3
Diluted earnings per share of common stock	$	0.83	$	1.30	$	1.60	$	2.36
Anti-dilutive stock-based awards excluded from the calculation of diluted earnings per share:	—		0.1		—		0.2