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Earnings Per Share (Tables)
 9 Months Ended
Sep. 30, 2018
Earnings Per Share [Abstract]  
Summary of Computation of Basic and Diluted Earnings Per Share
The following table sets forth the computation of basic and diluted earnings per share:
 
Three Months Ended September 30,
 
Nine Months Ended September 30,
 
2018
 
2017
 
2018
 
2017
Numerator:
(in millions, except share and per share amounts)
Net income attributable to common shareholders
$
163

 
$
170

 
$
502

 
$
483

Denominator:
 
 
 
 
 
 
 
Weighted-average common shares outstanding for basic earnings per share
164,227,243

 
166,694,755

 
165,622,428

 
166,195,433

Weighted-average effect of dilutive securities:
 
 
 
 
 
 
 
Employee equity awards(1)
2,071,426

 
2,315,145

 
1,931,307

 
3,036,349

Contingent issuance of common stock
992,247

 
992,247

 
330,749

 
334,384

Weighted-average common shares outstanding for diluted earnings per share
167,290,916

 
170,002,147

 
167,884,484

 
169,566,166

Basic and diluted earnings per share:
 
 
 
 
 
 
 
Basic earnings per share
$
0.99

 
$
1.02

 
$
3.03

 
$
2.91

Diluted earnings per share
$
0.97

 
$
1.00

 
$
2.99

 
$
2.85


____________
(1) 
PSUs, which are considered contingently issuable, are included in the computation of dilutive earnings per share on a weighted average basis when management determines the related performance criteria are met.