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Net Income Per Common Share (Tables)
 6 Months Ended
Jun. 30, 2019
Earnings Per Share [Abstract]  
Calculations For Basic And Diluted Earnings Per Share The table shows calculations for basic and diluted earnings per share:
(In millions, except per share data)
 
Three months ended June 30,
 
Six months ended June 30,
 
2019
 
2018
 
2019
 
2018
Numerator:
 
 

 
 

 
 

 
 

Net income—basic and diluted
 
$
428

 
$
217

 
$
1,123

 
$
186

Denominator:
 
 

 
 

 
 

 
 

Basic weighted-average common shares outstanding
 
163.3

 
163.2

 
163.1

 
163.6

Effect of share-based awards:
 
 

 
 

 
 

 
 

Stock options
 
1.2

 
0.8

 
1.1

 
0.9

Nonvested shares
 
0.7

 
0.5

 
0.7

 
0.5

Diluted weighted-average shares
 
165.2

 
164.5

 
164.9

 
165.0

Earnings per share:
 
 

 
 

 
 

 
 

Basic
 
$
2.62

 
$
1.33

 
$
6.89

 
$
1.13

Diluted
 
$
2.59

 
$
1.32

 
$
6.81

 
$
1.12

Number of anti-dilutive share-based awards
 
0.4

 
1.3

 
0.7

 
1.3