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Earnings Per Share (Tables)
 12 Months Ended
Dec. 31, 2019
Earnings Per Share [Abstract]  
Schedule of Earnings per Share reconciliation [Text Block]
 
Year Ended December 31,
(in millions except share and per share amounts)
2019
 
2018
 
2017
Basic earnings per share:
 

 
 

 
 

Net earnings attributable to BorgWarner Inc.
$
746

 
$
931

 
$
440

Weighted average shares of common stock outstanding
205.7

 
208.2

 
210.4

Basic earnings per share of common stock
$
3.63

 
$
4.47

 
$
2.09

 
 
 
 
 
 
Diluted earnings per share:
 
 
 

 
 

Net earnings attributable to BorgWarner Inc.
$
746

 
$
931

 
$
440

 
 
 
 
 
 
Weighted average shares of common stock outstanding
205.7

 
208.2

 
210.4

Effect of stock-based compensation
1.1

 
1.3

 
1.1

Weighted average shares of common stock outstanding including dilutive shares
206.8


209.5

 
211.5

Diluted earnings per share of common stock
$
3.61

 
$
4.44

 
$
2.08

 
 
 
 
 
 
Antidilutive stock-based awards excluded from the calculation of diluted earnings per share
0.1

 
0.1

 
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